JP2009005004A - Video display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate color correction of video images displayed according to: the characteristics of illumination light of an observation environment surrounding a monitor and an observer who observes the video images displayed on the monitor; and the display characteristics of the monitor. <P>SOLUTION: An observer turns the objective lens part 134 of a remote controller 130 for a test pattern (color patch) and a reference white board 114 displayed on a video display surface 112, adjusts a viewing angle and a focus and measures the illumination light characteristics of the observation environment and monitor display characteristics. Measured results are transmitted to a video signal processor 120, and the video signal processor 120 calculates a color conversion parameter on the basis of the received measured results. The video signal processor 120 applies the color conversion parameter to input video signals, and the video images matched with: the characteristics of the observation environment illumination light; and the display characteristics of the monitor are displayed on the monitor 110. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a video display system having a video signal processing device capable of processing a video signal input to a video display monitor device and displaying a high fidelity and realistic color reproduction video. About.

  As a method for enabling accurate color reproduction of a subject with a monitor device, a color target (color patch) is displayed on the monitor, and the color of the color target is measured using a colorimeter or the like to reproduce the color of the monitor device. A method for obtaining the characteristics is known. According to this method, the influence of the color reproduction characteristic of the monitor device is eliminated by correcting the signal input to the monitor device based on the color reproduction characteristic of the monitor device obtained as described above. It is possible to display an image. This method is generally called monitor calibration.

The color reproduction characteristics of the monitor device change from the cold start of the monitor device until the entire device warms up to a certain temperature, and also change with the passage of time since the start of new use of the monitor device. Is also known. Although the user appropriately performs monitor calibration in response to the above-described change in color reproduction characteristics of the monitor device, not all users can easily perform such monitor calibration. On the other hand, Patent Document 1 discloses a remote operation device in which a color sensor for detecting color reproduction characteristics of a display device is incorporated. The user operates the remote operation device to change the operation mode of the display device to the test mode. Then, by bringing the remote operation device closer to the display device, the display color is measured by a color sensor built in the remote operation device when various color patterns are sequentially displayed on the display device. The measurement result is transmitted to a control device connected to the display device, and color correction of an image displayed on the display device is performed based on the measurement result.
JP 2005-236469 A

  In the configuration of Patent Document 1 described above, a monitor calibration color sensor is incorporated in a remote operation device that is generally used to remotely operate the monitor device, so that the user can monitor calibration relatively easily. Can be executed.

  However, it is necessary to bring the remote operation device closer to the display device for monitor calibration, and the advantage of the remote operation device that the user can remotely operate the display device from a position away from the display device cannot always be utilized. In addition, a display device using a liquid crystal display device as a display device has a so-called viewing angle characteristic. Depending on the angle from which an image is observed with respect to the image display surface of the display device, Color reproduction characteristics may look different. Therefore, in a situation where the image is observed from an oblique position without facing the image display surface, even if monitor calibration is performed, the observer cannot always observe the image with ideal color reproduction. was there.

  An object of the present invention is to provide means for solving the above-described problems, and an object of the present invention is to provide a technique that allows a user to execute monitor calibration more easily. In addition, even when the image displayed on a monitor device having a relatively large contrast change and color reproduction characteristics with respect to the viewing angle change amount is observed from an oblique position, optimum color reproduction can be obtained according to the viewing angle. It is an object to provide a technique capable of performing monitor calibration as described above.

The present invention is applied to a video display system. The video display system is a remote control unit that can be operated from a video observation position where an observer observes a video displayed on a video display surface of a monitor device, and includes a color sensor and an image of a measurement object. Is formed on the light receiving surface of the color sensor, and the observer can see the spatial range of the measurement object captured by the objective optical system and the color sensor. A remote control unit having a measurement range confirmation unit;
A test pattern display unit configured to be able to display a test pattern including a color target on the video display surface;
The color sensor measures the color of the color target from the image of the test pattern formed on the light receiving surface by directing the objective optical system to the test pattern displayed on the video display surface by the observer A monitor display characteristic deriving unit for deriving a monitor display characteristic of the monitor device based on a result;
Video that derives color conversion parameters based on the monitor display characteristics, performs color conversion processing based on the color conversion parameters for the input video signal, and outputs the video signal after color conversion processing to the monitor device Having the signal processing unit solves the above-described problems.

  According to the present invention, the remote operation unit that can be operated from the image observation position, which is the position where the observer observes the image displayed on the image display surface of the monitor device, is provided with the color sensor and the image of the measurement object. An objective optical system configured to be formed on the light receiving surface, and a measurement range confirmation unit configured to allow an observer to visually observe the spatial range of the measurement target captured by the objective optical system and the color sensor Therefore, the observer is in the position to observe the image displayed on the image display surface, and the objective optical system is imaged while confirming which range of the measurement object is measured by the measurement range confirmation unit. The test pattern displayed on the display screen can be directed. Therefore, even when the image is observed from a position oblique to the image display surface of the monitor device having the viewing angle characteristic, the monitor display characteristic can be measured from the position. Then, the image of the test pattern displayed on the video display surface is guided to the color sensor by the objective optical system, and the monitor display characteristic of the monitor device is determined based on the result of measuring the color target color included in the test pattern by the color sensor. Derived by the monitor display characteristic deriving unit, a color conversion parameter is derived based on the monitor display characteristic, and color conversion processing is performed on the input video signal based on the color conversion parameter, and the monitor device performs color conversion processing. By outputting the subsequent video signal, it is possible to display an accurate color reproduction video by reducing the influence of the viewing angle characteristics of the monitor device. Further, since it is not necessary for the observer to move to a position directly facing the image display surface when measuring the monitor display characteristics, it is possible to easily measure the monitor display characteristics.

− First embodiment −
FIG. 1 is a block diagram schematically showing the overall configuration of a video display system 100 according to the first embodiment of the present invention. The video display system 100 includes a video display monitor device 110, a video signal processing device 120 connected to the monitor device 110, and a remote controller 130.

  The monitor device 110 has a video display surface 112 for displaying video. A reference white plate 114 is provided above the monitor device 110. The reference white plate 114 is used when measuring the spectral characteristics of illumination light that illuminates the environment surrounding the monitor device 110 and the observer who observes the image displayed on the image display surface 112 of the monitor device 110 by a method described later. It is an achromatic standard reflector having uniform spectral reflection characteristics used. Hereinafter, an environment surrounding the monitor device 110 and an observer who observes an image displayed on the monitor device 110 is referred to as an “observation environment”. Further, natural light for illuminating the observation environment, or a tungsten lamp, a fluorescent lamp, and the like are collectively referred to as observation environment illumination. And the light from observation environment illumination is called observation environment illumination light. In FIG. 1, an example in which the reference white plate 114 is provided on the upper portion of the monitor device 110 is shown, but the reference white plate 114 may be provided on the left and right or lower portions of the monitor device 110. The reference white plate 114 may be provided adjacent to the monitor device 110 or may be provided separately.

  The video signal processing device 120 inputs an input video signal and input video profile information associated with the input video signal, performs processing described in detail later on the input video signal, and converts the processed video signal to the monitor device 110. For output. The video signal processing apparatus 120 can be implemented as a set top box (STB). Alternatively, the video signal processing device 120 can be built in an external device such as a video recorder or can be built in the monitor device 110. Here, it is assumed that the input video signal is a multispectral video signal generated by photographing a subject with an N-band multispectral camera. An N-band multispectral camera uses color filters or dichroic prisms with different spectral characteristics to split light from the subject into N-band light with different spectral bands, and inputs them using an image sensor. Thus, the camera can generate a video signal composed of N bands.

  When photographing with a multispectral camera, the spectral characteristics of the light illuminating the subject (hereinafter referred to as “subject illumination light”) are also recorded together with the video signal. The input video profile information input to the video signal processing device together with the input video signal includes information related to the spectral characteristics of the subject illumination light (hereinafter referred to as “input illumination light spectrum information”), the multispectral camera Information related to the device profile. The information related to the device profile includes spectral transmission characteristics of a lens included in the multispectral camera, spectral sensitivity characteristics and gradation characteristics of an image sensor built in the multispectral camera. Hereinafter, a combination of the spectral transmission characteristic of the lens of the multispectral camera and the spectral sensitivity characteristic of the image sensor is referred to as “input spectral sensitivity characteristic information”. Information related to the gradation characteristics of the image sensor is referred to as “input γ characteristic information”. This input γ (gamma) characteristic information is provided corresponding to each spectrum (each band) of the multispectral camera.

  The video signal processing device 120 includes a signal reception unit 121, a test pattern video generation unit 122, a display video switching unit 124, a color conversion parameter calculation unit 125, and a color conversion unit 126. The signal receiving unit 121 receives a signal transmitted from a remote controller 130 on a carrier wave such as light or radio wave, decodes the signal, extracts a command, information, and the like from the signal. The test pattern video generation unit 122 generates a test pattern video signal for displaying a test pattern video described later on the monitor device 110.

  The display video switching unit 124 is for switching the video displayed on the monitor device 110 between the video based on the input video signal and the video based on the test pattern video signal. The color conversion parameter calculation unit 125 includes observation environment illumination light characteristic information and monitor display characteristic information included in a signal transmitted from the remote controller 130, and input video profile information input to the video signal processing device 120 together with the input video signal. Based on the above, a color conversion parameter is generated and output to the color conversion unit 126 as will be described later. The observation environment illumination light characteristic information and the monitor display characteristic information will be described in detail later. Based on the color conversion parameter output from the color conversion parameter calculation unit 125, the color conversion unit 126 performs color conversion processing (described later) on the input video signal and outputs it to the display video switching unit 124.

  The remote controller 130 includes a user interface unit 132, an objective lens unit 134, a beam splitter 136, a focus adjustment mechanism 138, a visual field adjustment mechanism 140, a color sensor unit 142, a sensor control unit 144, and a transmission control unit 146. And a signal transmission unit 148 and an eyepiece unit 150. The remote controller 130 can perform remote operations of a normal remote controller such as switching of an input video signal, volume adjustment, channel selection, etc., when an observer operates the user interface unit 132. The remote controller 130 also has a color measurement function described later.

  The objective lens unit 134 is for forming an image of a test pattern image displayed on the reference white plate 114 or the image display surface 112. A part of the light transmitted through the objective lens unit 134 is guided to the light receiving surface of the color sensor unit 142 by the beam splitter 136, and the remaining light is transmitted to the eyepiece unit 150 through the beam splitter 136. The eyepiece 150 has an eyepiece optical system including a Porro prism, Porro mirror, roof prism, roof mirror, or the like. The eyepiece 150 is configured such that when an observer puts his eyes on the eyepiece 150 and looks inside, the target mark that surrounds a region of a predetermined area in the field of view overlaps the field of view.

  When the user operates the user interface unit 132 in a state where the observer is in a position to observe the image displayed on the image display surface 112, operations such as switching of the input image signal, volume adjustment, and channel selection can be performed as described above. it can. In addition, when the observer operates the user interface unit 132 to set the video signal processing device 120 to the calibration mode, the calibration mode is executed based on the video signal transmitted from the video signal processing device 120 to the monitor device 110. At this time, an operation guidance display of the remote controller 130, a test pattern image such as a color target, and the like are displayed.

  In FIG. 4, when the monitor device 110 is a so-called RGB monitor and the maximum input value of each RGB color is 255 (24-bit input color monitor), a test pattern (color mark) 401 displayed on the video display surface 112, 402, 403, 404, 405, 406, and 407 are illustrated. Each of these test patterns is a single color pattern of any of R, G, and B primary colors. Each test pattern is provided with a high-contrast pattern 410 for facilitating the focus adjustment as shown only in the test patterns 401 and 405 in FIG. The pattern shape of the high contrast pattern 410 can be changed as needed. In addition, the high contrast pattern 410 may not be displayed when the focus adjustment operation is completed. The test patterns 401, 402, 403, 404, 405, 406, and 407 are displayed one by one in a part or all of the display screen 112.

  In the example illustrated in FIG. 4, the test pattern 401 is a red pattern having the highest saturation and a combination of RGB pixel values of (255, 0, 0). Similarly, the test pattern 402 is a green pattern having the highest saturation having a combination of RGB pixel values of (0, 255, 0). The test pattern 403 is a blue pattern having the highest saturation and a combination of RGB pixel values of (0, 0, 255). The test pattern 404 is a pattern having the lowest luminance (darkness) having a combination of RGB pixel values of (0, 0, 0).

  The test pattern 405 is a red pattern of intermediate saturation having a combination of RGB pixel values of (128, 0, 0). The test pattern 406 is an intermediate chroma green pattern having a combination of RGB pixel values of (0, 128, 0). The test pattern 407 is an intermediate saturation blue pattern having a combination of RGB pixel values of (0, 0, 128). In FIG. 4, as described above, the intermediate saturation test pattern has three RGB pixel values of (128, 0, 0), (0, 128, 0), (0, 0, 128). An example is shown, but instead of this, or in addition to this, there are many test patterns of intermediate saturation in which 128 values in the pixel values are changed at fine gradation intervals such as 32, 64, 96,. It may be included. In that case, although time is required for calibration, more accurate information of the tone curve (gradation characteristics) of the video display surface 112 can be obtained. Further, it may be configured such that the observer can appropriately select whether to perform calibration using all of these test patterns or to perform calibration using a part of them.

  Referring to FIG. 1 again, according to the operation guidance, the observer puts his eyes on the eyepiece 150 and collimates the remote controller 130 on the test pattern image displayed on the image display surface 112 or the reference white plate 114. . At that time, the observer operates the visual field adjustment mechanism 140 to adjust the angle of view of the objective lens unit 134, and the region surrounded by the target mark displayed in the finder visual field is an image of the test pattern image or the reference white plate 114. The field of view is adjusted to capture all or part of each of the images. The observer also operates the focus adjustment mechanism 138 while looking into the eyepiece 150 to adjust the focus so that the image of the test pattern displayed on the video display surface 112 or the image of the reference white plate 114 can be seen sharply. . As a result, the image formed on the light receiving surface of the color sensor unit 142 is also sharp. Since the remote controller 130 has the visual field adjustment mechanism and the focus adjustment mechanism 138 as described above, the observer does not need to approach the display screen 112 or face the remote controller 130 to the display screen 112. Accordingly, the observer can measure the characteristics of the observation environment illumination light and the monitor display characteristics by remote control from the position where the video displayed on the display screen 112 is observed.

  The color sensor unit 142 includes three or more types, preferably six or more types of sensors, in which light of each color dispersed by spectral elements such as color filters having different spectral characteristics is provided for light of each color. It is configured to be able to measure the spectral characteristics of the light guided to the (light receiving unit) and incident on the color sensor unit 142. The color sensor unit 142 also includes an image sensor composed of multiple pixels, such as a CCD or C-MOS sensor, and three or more, preferably six or more color filters having different spectral transmission characteristics are received by each pixel. It may be composed of a single-plate color image sensor arranged in a mosaic at the part. Alternatively, a spectroscopic optical system such as a dichroic prism is provided in a portion where light from the objective lens unit 134 is incident on the color sensor unit 142 to divide the light into a plurality of light beams having different spectral bands, and each of them is converted into a different monochrome image sensor. It may be composed of a multi-plate image sensor that leads. The color sensor unit 142 can generate XYZ tristimulus values, but it is desirable to generate spectral values for more accurate color reproduction. The color sensor unit 142 is also configured to receive light in a region surrounded by the target mark described above.

  The sensor control unit 144 controls the timing at which color measurement is started in the color sensor unit 142 and performs processing by inputting a signal output from the color sensor unit 142, and a test pattern displayed on the video display surface 112 and Each color of the light reflected by the reference white plate 114 is measured, and observation environment illumination light characteristic information and monitor display characteristic information are generated from the measurement result and output to the transmission control unit 146. The observation environment illumination light characteristic information and the monitor display characteristic information are output from the transmission control unit 146 to the video signal processing device 120 via the signal transmission unit 148. More specifically, when the observer controls the reference white plate 114 and the sensor control unit 144 inputs a signal from the color sensor unit 142, the characteristics of the observation environment illumination light can be obtained. Further, one test pattern 401, 402,..., 407 indicates that the sensor control unit 144 inputs a signal from the color sensor unit 142 while the observer collimates the test pattern displayed on the video display surface 112. By repeating the display each time it is displayed, it is possible to obtain the display characteristics of the monitor, that is, the chromaticity values, display gradation characteristics, offset (luminance level when displaying darkness) of the display primary colors of the monitor device 110, and the like. it can.

  FIG. 2 is a block diagram illustrating the internal configuration of the color conversion parameter calculation unit 125 shown in FIG. The color conversion parameter calculation unit 125 includes an input video profile information storage unit 202, an input γ (gamma) correction data storage unit 204, an observation environment illumination light characteristic information storage unit 206, an illumination conversion parameter calculation unit 208, and an illumination conversion. A parameter storage unit 210, a monitor display characteristic information storage unit 212, a monitor color correction parameter calculation unit 214, and a monitor color correction parameter storage unit 222 are included.

  The input video profile information storage unit 202 stores input video profile information input from the outside together with the input video signal. The input illumination light spectrum information, the input spectral sensitivity characteristic information, and the input γ characteristic information for each spectrum are separated and extracted from the input video profile information, and the input illumination light spectrum information and the input spectral sensitivity characteristic information are converted into the illumination conversion parameter calculation unit 208. In addition, the input γ characteristic information for each spectrum is output to the input γ correction data storage unit 204.

  The observation environment illumination light characteristic information included in the signal transmitted from the remote controller 130 is extracted by the signal reception unit 121, input to the observation environment illumination light characteristic information storage unit 206, and stored therein, and the information is calculated as the illumination conversion parameter calculation. Is output to the unit 208. The illumination conversion parameter calculation unit 208 includes observation environment illumination light characteristic information input from the observation environment illumination light characteristic information storage unit 206, input illumination light spectrum information and input spectral sensitivity characteristic information input from the input video profile information storage unit 202, and The illumination conversion parameter is calculated from the above and output to the illumination conversion parameter storage unit 210.

  The monitor display characteristic information included in the signal transmitted from the remote controller 130 is extracted by the signal receiving unit 121 and input to and stored in the monitor display characteristic information storage unit 212. The information is stored in the monitor color correction parameter calculation unit 214. Is output. The monitor color correction parameter calculation unit 214 includes an offset correction data calculation unit 216, a tone curve correction data calculation unit 218, and a color conversion data calculation unit 220. Based on the monitor display characteristic information input from the monitor display characteristic information storage unit 212, the offset correction data calculation unit 216 stores the offset correction data of the monitor device 110, and the tone curve correction data calculation unit 218 stores the tone curve correction data of the monitor device 110. The color conversion data calculation unit 220 calculates color conversion data corresponding to the spectral emission characteristics of the display primary colors of the monitor device 110 and outputs the calculated color conversion data to the monitor color correction parameter storage unit 222.

  The monitor color correction parameter storage unit 222 includes an offset correction data storage unit 224, a tone curve correction data storage unit 226, and a color conversion data storage unit 228. Of the data input from the monitor color correction parameter calculation unit 214, offset correction data is stored in the offset data storage unit 224, tone curve correction data is stored in the tone curve correction data storage unit 226, and color conversion data is stored in the color conversion data storage unit. 228, respectively.

  FIG. 3 is a block diagram illustrating an internal configuration of the color conversion unit 126 shown in FIG. The color conversion unit 126 includes a color conversion processing unit 302 and a monitor color conversion unit 304. In the color conversion processing unit 302, based on the input γ correction data input from the input γ correction data storage unit 204, lookup tables (LUT) 1, LUT 2,..., LUT N (hereinafter, these LUTs are referred to as “LUT 308”. Are collectively generated and stored. Further, based on the illumination conversion parameter input from the illumination conversion parameter storage unit 210, data for illumination conversion processing is generated and stored in the illumination conversion processing unit 310. The LUT 308 and the illumination conversion processing data are input from a multi-primary color input video signal (in the example shown in FIG. 3, an N-band, that is, a multi-primary color input video signal of N primary colors is shown). This is used when processing is performed by the unit 302.

  By the way, in the technical field of performing advanced color reproduction based on multi-primary color input video signals, color reproduction technology using rendering illumination is known. This technology estimates the spectral reflectance of a subject from video data obtained by a multispectral camera based on the characteristics of the photographic equipment and the spectral spectrum of the shooting environment illumination light, and obtains the spectral data of the illumination light having an arbitrary spectral intensity. This is a technique for reproducing (simulating) and displaying the color (spectrum of light reflected by the subject) when the subject is illuminated with arbitrary illumination light by multiplying the above spectral reflectance. For example, by multiplying the spectral reflectance by the spectral spectrum data of illumination light in the observation environment, the subject exists in the observation environment, which is the environment surrounding the observer who observes the image displayed on the display device. By reproducing and displaying the color as it was, the viewer can feel the image as very realistic. In the present invention, the illumination light applied to the estimated spectral reflectance of the subject when simulating how the subject can be seen when illuminated with illumination light having a certain spectral characteristic. Is referred to as rendering illumination light. In the present invention, the observation environment illumination light is applied as the rendering illumination light and an image is displayed on the image display surface 112 of the monitor device 110, so that the subject under the illumination light source in the observation environment is different from that at the time of shooting. Reproduce the colors.

  Returning to the description of the color conversion processing in the color conversion processing unit 302, the LUT 308 is first applied to the input video signal in the color conversion processing unit 308, and so-called tone curve correction is performed on each of the multi-primary color input video signals. The effect of the camera level and gamma characteristics is removed. Subsequently, the illumination conversion processing unit 310 performs matrix calculation on the input video signal to perform illumination conversion processing. That is, based on the input illumination light spectrum information (information related to the spectral characteristics of the light illuminating the subject at the time of shooting) and the input spectral sensitivity characteristic information (input spectral sensitivity characteristic information of the device used for shooting), Spectral reflectance estimation video data of the subject is obtained from the input video signal, and processing for applying rendering illumination light based on observation environment illumination light characteristic information to the spectral reflectance estimation video data is performed. The illumination conversion unit 310 further performs processing for converting the image data after the illumination conversion obtained as described above into X, Y, and Z colorimetric image data. The X, Y, Z colorimetric image data obtained in this way is sent to the monitor color conversion unit 304.

  The color separation calculation unit 306 in the monitor color conversion unit 304 generates and stores data for color conversion processing based on the color conversion data output from the color conversion data storage unit 228 in the monitor color correction parameter storage unit 222. Is done. This data for color conversion processing can be a 3 × 3 matrix when the monitor device 110 is a display device of three primary colors. When the monitor device 110 is a display device for M primary colors (M> 4), the color conversion data generates display video signals for the primary colors from the colorimetric value video data input from the color conversion processing unit 302. It is possible to use a look-up table. The monitor color conversion unit 304 further performs a lookup table based on the offset correction data and tone curve correction data input from the offset correction data storage unit 224 and tone curve correction data storage unit 226 in the monitor color correction parameter storage unit 222. (LUT) 1, LUT2,..., LUT M (hereinafter, these LUTs are collectively referred to as “LUT 312”). The LUT 312 is used to correct the gamma characteristic and offset of the video display surface 112 of the monitor device 110.

  FIG. 5 is a flowchart schematically showing a measurement processing procedure of the observation environment illumination light characteristic and the monitor display characteristic executed by the remote controller 130. Hereinafter, an operation mode for measuring the observation environment illumination light characteristic and the monitor display characteristic executed by the remote controller 130 is referred to as a calibration mode. FIG. 6 is a flowchart schematically showing the processing procedure of the calibration mode executed by the video signal processing device 120. Since the remote controller 130 and the video signal processing device 120 cooperate with each other to execute the calibration mode, the remote controller 130 and the video signal processing device 120 will be described below with reference to both FIG. 5 and FIG. The processing to be performed will be described in parallel.

  In S501, the remote controller 130 detects that the observer has pressed the calibration mode execution start switch of the user interface unit 132, and transmits a calibration mode execution start command to the video signal processing apparatus 120 in S502.

  In step S <b> 601, the video signal processing apparatus 120 receives the calibration mode execution start command issued from the remote controller 130 as described above. In step S <b> 602, the video signal processing apparatus 120 displays an operation guidance for the reference white plate “collimation”. That is, the video signal processing device 120 switches the display video switching unit 124 so that the test pattern video generated by the test pattern video generation unit 122, operation guidance, and the like are displayed on the video display surface 112, and , Eye the eyepiece 150 of the remote controller 130 to collimate the reference white plate 114, operate the visual field adjustment mechanism 140 so that the image of the reference white plate 114 is captured in the target mark in the visual field, Subsequently, after operating the focus adjustment mechanism 138 so that the reference white plate 114 is focused, an operation guidance for pressing the measurement start switch in the user interface unit 132 is displayed. At this time, the operation guidance displayed on the video display surface 112 is preferably a display with reduced luminance. This is because, when measuring the light reflected by the reference white plate 114 with the remote controller 130, it is desirable to suppress the influence of the light emitted from the image display surface 112 in order to perform highly accurate measurement. is there. Alternatively, nothing may be displayed on the video display surface 112 while the observer operates the remote controller 130 to perform measurement. In subsequent S603, the video signal processing apparatus 120 maintains the polling state until the observation environment illumination light characteristic information is emitted from the remote controller 130.

  In S503, the remote controller 130 determines whether or not the observer has operated the observation environment illumination light characteristic measurement start switch in the user interface unit 132, and polls until this determination is affirmed. In accordance with the above operation guidance, the observer focuses on the reference white plate 114 with the eye on the eyepiece 150 of the remote controller 130, and the field of view is such that the image of the reference white plate 114 is captured to the full extent within the target mark in the field of view. When the adjustment mechanism 140 is operated, and then the focus adjustment mechanism 138 is operated so that the reference white plate 114 is focused, and then the measurement start switch in the user interface unit 132 is pressed, this operation is detected in S503. In step S504, the remote controller 130 executes observation environment illumination light characteristic measurement processing.

  In S505, the remote controller 130 generates observation environment illumination light characteristic information based on the measurement result in S504, and sends the observation environment illumination light characteristic information to the video signal processing device 120 in subsequent S506. Thereafter, in S507, the remote controller 130 determines whether or not the observer has operated the monitor display characteristic measurement start switch in the user interface unit 132, and polls until this determination is affirmed.

  In S603, the video signal processing apparatus 120 in the polling state as described above receives the observation environment illumination light characteristic information transmitted from the remote controller 130, and in the subsequent S604, the observation environment illumination light characteristic information is input to the observation environment illumination light characteristic information. Store in the storage unit 206. In S605, the video signal processing apparatus 120 displays one of the test patterns as described with reference to FIG. 4 on the video display surface 112, and displays operation guidance for the test pattern “collimation” in S606. That is, the video signal processing device 120 collimates the test pattern displayed on the video display surface 112 by placing the eye on the eyepiece 150 of the remote controller 130 with respect to the observer, and fills the target mark within the visual field. The visual field adjustment mechanism 140 is operated so that an image of the test pattern can be captured, and then the focus adjustment mechanism 138 is operated so that the test pattern is focused, and then the measurement start switch in the user interface unit 132 is pressed. The operation guidance to that effect is displayed. In subsequent S <b> 607, the video signal processing apparatus 120 maintains the polling state until a signal “measurement complete” is issued from the remote controller 130.

  In accordance with the above operation guidance, the observer focuses on the eyepiece 150 of the remote controller 130 to collimate the test pattern, and the visual field adjustment mechanism 140 is set so that the image of the test pattern can be captured completely within the target mark in the visual field. When the measurement start switch in the user interface unit 132 is pressed after operating the focus adjustment mechanism 138 so that the test pattern is focused, this operation is detected in S507, and the remote controller 130 determines in S508. Execute monitor test pattern color measurement processing. When the monitor test pattern color measurement process is completed, the remote controller 130 outputs a “measurement complete” signal to the video signal processing apparatus 120 in step S509. In S510, the remote controller 130 determines whether or not the color measurement of all the test patterns (test patterns 401, 402,..., 407 in FIG. 4) has been completed, and if not, returns to S507 and described above. Repeat the process.

  As the “measurement complete” signal is output from the remote controller 130 in S509 as described above, the determination in S607 by the video signal processing device 120 is affirmed. In S608, the video signal processing apparatus 120 determines whether or not the display of all the test patterns (test patterns 401, 402,..., 407 in FIG. 4) is completed. If the display is negative, the process returns to S605 and described above. Repeat the above process to display another test pattern.

  The test patterns 401, 402,..., 407 shown in FIG. 4 are imaged by repeatedly performing the processing from S507 to S510 by the remote controller 130 and the processing from S605 to S608 by the video signal processing device 120. The color is measured sequentially displayed on the display surface 112. In step S511, the remote controller 130 generates monitor display characteristic information based on the color measurement result described above, and transmits the monitor display characteristic information to the video signal processing apparatus 120 in step S512.

  In step S609, the video signal processing apparatus 120 receives the monitor display characteristic information transmitted from the remote controller 130, and stores the monitor display characteristic information in the monitor characteristic information storage unit 212 in subsequent step S610.

  The video signal processing apparatus 120 calculates the illumination conversion parameter in S611 based on the input illumination light spectrum information, the input spectral sensitivity characteristic information, and the observation environment illumination light characteristic information described above, and converts the illumination conversion parameter into the illumination conversion parameter in S612. Store in the storage unit 210. In S613, the video signal processing device 120 calculates a monitor color correction parameter based on the monitor display characteristic information stored in the monitor display characteristic information storage unit 212. In S614, the monitor color correction parameter is stored in the monitor color correction parameter. Store in the unit 222.

  Based on the illumination conversion parameter and the monitor color correction parameter obtained by executing the calibration mode described above, the video signal processing device 120 performs color conversion processing on the input video signal and outputs it to the monitor device 110. As described above, the video displayed on the video display surface 112 is more accurate in color reproduction and more realistic. At this time, as described above, since the observer can execute the calibration mode from the position where the video displayed on the video display surface 112 of the monitor device 110 is observed, the calibration is performed more easily. For a monitor device that has a viewing angle characteristic, calibration according to the viewing angle can be performed. Therefore, depending on the positional relationship between the monitor device 110 (image display surface 112) and the observer. Therefore, accurate color reproduction can be performed. Further, when the remote controller 130 includes a viewfinder unit including the objective lens unit 134, the beam splitter 136, the eyepiece unit 150, and the like, when performing measurement from a position away from the monitor device 110 and the reference white plate 114. Since accurate collimation can be performed, correct calibration can be performed.

  In the above, the example in which the observation environment illumination light characteristic information and the monitor display characteristic information are obtained simultaneously when the observer operates the remote controller 130 to execute the calibration mode has been described. Only the characteristics or only the monitor display characteristics may be measured. In this case, the observer obtains only the observation environment illumination light characteristic information corresponding to the case where the observation environment illumination light changes from the outside light to the room light, or the room illumination is switched from the fluorescent lamp to the tungsten lamp. It is also possible to perform calibration. In addition, regarding the process of generating the observation environment illumination light characteristic information performed in the processing procedure of S505 in the remote controller 130 and the process of generating the monitor display characteristic information performed in the processing procedure of S511, the video signal processing device 120 side. You may make it perform. In this case, information regarding the color of the observation environment illumination light detected by the color sensor unit 142 of the remote controller 130 and the color of the test pattern displayed on the video display surface 112 is sent from the remote controller 130 to the video signal processing device 120. .

− Second Embodiment −
FIG. 7 is a block diagram schematically showing an overall configuration of a video display system 100A according to the second embodiment of the present invention. In the video display system 100A shown in FIG. 7, the same components as those in the video display system 100 according to the first embodiment shown in FIG. The difference from the embodiment will be mainly described. Further, structurally similar components are given the same reference numerals as those shown in the respective drawings for explaining the first embodiment, with alphabets added to the same numbers.

  In the video display system 100 according to the first embodiment, the reference white plate 114 is provided on the upper part of the monitor device 110, and when the observation environment illumination light characteristic is obtained, the observer can see the eyepiece of the remote controller 130. The reference white plate 114 was collimated by placing the eyes on the portion 150. On the other hand, in the video display system 100A according to the second embodiment, the illumination sensor unit 702 is provided on the upper part of the monitor device 110, and the observation environment illumination light characteristic is measured by the illumination sensor unit 702. Therefore, only the monitor display characteristic is measured on the remote controller 130A side. The illumination sensor unit 702 includes a color sensor unit housed in a milky white translucent hemispherical cover. The color sensor unit can have a configuration similar to that of the color sensor unit 142 described in the first embodiment.

  The video signal processing apparatus 120A includes an illumination sensor control unit 704, and the illumination sensor unit 702 and the illumination sensor control unit 704 are connected by a wired or wireless system. The illumination sensor control unit 704 is also connected to the signal reception unit 121 and the color conversion parameter calculation unit 125.

  When an observer who observes an image displayed on the image display surface 112 of the monitor device 110 operates an observation environment illumination light characteristic measurement switch provided in the user interface unit 132 of the remote controller 130A, an observation environment illumination light characteristic measurement command is issued. The included signal is transmitted from the signal transmission unit 148 of the remote controller 130A to the signal reception unit 121 of the video signal processing device 120A. The signal receiving unit 121 receives this signal and outputs a command signal for the observation environment illumination light measurement start finger to the illumination sensor control unit 704. Upon receiving this command signal, the illumination sensor control unit 704 outputs information related to the observation environment illumination light characteristic obtained by the measurement by the illumination sensor unit 702 to the color conversion parameter calculation unit 125. Hereinafter, the operation mode for measuring the observation environment illumination light characteristic, which is executed in the video signal processing device 120A, is referred to as a “first calibration mode”.

  On the other hand, when the observer operates a monitor display characteristic measurement switch provided in the user interface unit 132 of the remote controller 130A, a signal including a monitor display characteristic measurement command is sent from the signal transmission unit 148 of the remote controller 130A to the signal of the video signal processing device 120A. It is transmitted to the receiving unit 121. The signal receiving unit 121 receives this signal and outputs a video signal for displaying the operation guidance and test pattern of the remote controller 130A on the video display surface to the monitor device 110 in the same manner as described in the first embodiment. At the same time, the measurement result of the monitor display characteristic is input from the remote controller 130A. Hereinafter, an operation mode for measuring the monitor display characteristic, which is executed in the video signal processing apparatus 120A, is referred to as a “second calibration mode”.

  FIG. 8A schematically shows an observation environment illumination light characteristic measurement command transmission procedure executed by the remote controller 130A, and FIG. 8B schematically shows a monitor display characteristic measurement processing procedure executed by the remote controller 130A. FIG. FIG. 9A shows the processing procedure of the observation environment illumination light characteristic measurement mode (first calibration mode) executed by the video signal processing device 120A, and FIG. 9B shows the video signal processing device 120A. 5 is a flowchart schematically showing a processing procedure of a mode for measuring monitor display characteristics (second calibration mode) executed in step S2. Similarly to the first embodiment, the remote controller 130A and the video signal processing device 120A cooperate with each other to execute the calibration mode. Therefore, the remote controller will be described below with reference to both FIG. 8 and FIG. Processing performed by both 130A and the video signal processing apparatus 120A will be described in parallel.

  In step S801, the remote controller 130A detects that the observer has pressed the first calibration mode execution start switch of the user interface unit 132. In step S802, the remote controller 130A transmits a first calibration mode execution start command to the video signal processing device 120A. And finish the process.

  In step S901, the video signal processing apparatus 120A receives the first calibration mode execution start command issued from the remote controller 130A as described above. In step S <b> 902, the illumination sensor control unit 704 in the video signal processing apparatus 120 </ b> A inputs the observation environment illumination light characteristic measurement result from the illumination sensor unit 702.

  In S903, the video signal processing apparatus 120A stores observation environment illumination light characteristic information based on the measurement result of the observation environment illumination light characteristic output from the illumination sensor unit 702 in the observation environment illumination light characteristic information storage unit 206 (FIG. 2). To do. Based on the input illumination light spectrum information and the input spectral sensitivity characteristic information extracted from the input video profile information and the observation environment illumination light characteristic information stored in S903, the video signal processing device 120A calculates an illumination conversion parameter in S904, In step S905, the illumination conversion parameter is stored in the illumination conversion parameter storage unit 210, and the process ends.

  Next, the second calibration mode will be described with reference to FIGS. 8B and 9B.

  In step S803, the remote controller 130A detects that the observer has pressed the second calibration mode execution start switch of the user interface unit 132. In step S804, the remote controller 130A transmits a second calibration mode execution start command to the video signal processing device 120A. To do. Thereafter, in S805, the remote controller 130A determines whether or not the observer has operated the monitor display characteristic measurement start switch in the user interface unit 132, and polls until this determination is affirmed.

  In S906, the video signal processing apparatus 120A receives the second calibration mode execution start command issued from the remote controller 130A as described above. In S907, the video signal processing apparatus 120A displays one of the test patterns as described with reference to FIG. 4 on the video display surface 112, and displays operation guidance for the test pattern “collimation” in S908. That is, the video signal processing device 120A collimates the test pattern displayed on the video display surface 112 with the eyes on the eyepiece 150 of the remote controller 130A, and fills the target mark in the field of view. The visual field adjustment mechanism 140 is operated so that an image of the test pattern can be captured, and then the focus adjustment mechanism 138 is operated so that the test pattern is focused, and then the measurement start switch in the user interface unit 132 is pressed. The operation guidance to that effect is displayed. In the subsequent S909, the video signal processing apparatus 120A maintains the polling state until the “measurement complete” signal is issued from the remote controller 130A.

  In accordance with the above operation guidance, the observer focuses on the eyepiece 150 of the remote controller 130A, collimates the test pattern, and sets the visual field adjustment mechanism 140 so that the image of the test pattern can be captured completely within the target mark in the visual field. When the measurement start switch in the user interface unit 132 is pressed after operating the focus adjustment mechanism 138 so that the test pattern is focused, this operation is detected in S805, and the remote controller 130A performs S806. Execute monitor test pattern color measurement processing. When the monitor test pattern color measurement process is completed, the remote controller 130A outputs a “measurement complete” signal to the video signal processing apparatus 120A in S807. In S808, the remote controller 130A determines whether or not the color measurement of all the test patterns (test patterns 401, 402,..., 407 in FIG. 4) is completed, and if not, returns to S805 and described above. Repeat the process.

  As the “measurement complete” signal is output from the remote controller 130A in S807 as described above, the determination in S909 by the video signal processing device 120A is affirmed. In S910, the video signal processing apparatus 120A determines whether or not the display of all the test patterns (test patterns 401, 402,..., 407 in FIG. 4) has been completed. If NO, the process returns to S907 and described above. Repeat the above process to display another test pattern.

  The test patterns 401, 402,..., 407 shown in FIG. 4 are imaged by repeatedly performing the processing from S805 to S808 by the remote controller 130A and the processing from S907 to S910 by the video signal processing device 120A. The color is measured sequentially displayed on the display surface 112. In step S809, the remote controller 130A generates monitor display characteristic information based on the color measurement result described above, and transmits the monitor display characteristic information to the video signal processing apparatus 120A in step S810.

  In S911, the video signal processing apparatus 120A receives the monitor display characteristic information transmitted from the remote controller 130A, and stores the monitor display characteristic information in the monitor characteristic information storage unit 212 in subsequent S912.

  In S913, the video signal processing apparatus 120A calculates a monitor color correction parameter based on the monitor display characteristic information stored in the monitor display characteristic information storage unit 212. In the subsequent S914, the monitor color correction parameter is stored in the monitor color correction parameter. Store in the unit 222.

  Based on the illumination conversion parameter and the monitor color correction parameter obtained by executing the first and second calibration modes described above, the video signal processing device 120A performs a color conversion process on the input video signal to monitor the monitor device 110. Output to.

  As described above, in the first calibration mode in which the observation environment illumination light characteristic is measured to obtain the illumination conversion parameter, the observation environment illumination light characteristic is obtained by the illumination sensor unit 702 provided separately from the remote controller 130A. Since the measurement is performed, the observer does not need to put his eyes on the eyepiece 150 of the remote controller 130A, and only has to press the switch of the user interface unit 132. Therefore, the observer can easily measure the observation environment illumination light characteristic. Further, in the first embodiment, the light reflected by the reference white plate 114 is detected to measure the observation environment illumination light characteristic, whereas the illumination sensor unit 702 in the second embodiment is The observation environment illumination light directly incident on the illumination sensor unit 702 can be measured and the incident angle can be increased, so that a relatively large amount of light can be guided into the illumination sensor unit 702, and the observation environment is compared. It is possible to perform accurate measurement even in a dark situation.

  The example in which the first calibration mode and the second calibration mode are executed independently of each other has been described above. However, in response to the observer pressing the calibration mode execution start switch in the user interface unit 132. These first and second calibration modes may be executed continuously. Furthermore, the measurement of the observation environment illumination light characteristic may be automatically performed at a predetermined timing on the main body of the video signal processing device 120A without the observer operating the remote controller 130A. .

  Further, the monitor display characteristic information generation processing performed in the processing procedure of S809 in the remote controller 130A may be performed on the video signal processing device 120A side. In this case, information regarding the color of the test pattern displayed on the video display surface 112 detected by the color sensor unit 142 of the remote controller 130A is sent from the remote controller 130A to the video signal processing device 120A.

− Third embodiment −
FIG. 10 is a block diagram schematically showing an overall configuration of a video display system 100B according to the third embodiment of the present invention. FIG. 11 is a block diagram illustrating an internal configuration of the color conversion parameter calculation unit 125A shown in FIG. In the video display system 100B shown in FIG. 10 and the color conversion parameter calculation unit 125A shown in FIG. 11, the same components as those of the video display system 100 according to the first or second embodiment are denoted by the same reference numerals. Thus, the description thereof is omitted, and the description will focus on differences from the first or second embodiment. In addition, components that are functionally similar to each other are denoted by the same reference numerals as those shown in the above-described drawings for explaining the first or second embodiment, with alphabets added. Yes.

  In the first and second embodiments, the remote controller 130 or 130A has a finder optical system, and the observer looks at the remote controller 130 or 130A toward the measurement target with the eye on the eyepiece 150. It was equivalent. On the other hand, in the video display system 100B according to the third embodiment, the remote controller 130B does not have a finder optical system, but has a small display device 1002 instead. The objective lens unit 134 includes an automatic focus adjustment mechanism 138A.

  The image sensor unit 1008 is a multi-pixel imaging device (two-dimensional image sensor), such as a CCD or C-MOS sensor, and includes three or more, preferably six or more color filters having different spectral transmission characteristics. It can be constituted by a single-plate color image sensor arranged in a mosaic pattern at the light receiving portion of each pixel. Alternatively, a spectroscopic optical system such as a dichroic prism is provided in a portion where the light from the objective lens unit 134 enters the image sensor unit 1008 to divide the light into a plurality of light beams having different spectral bands, and each of them becomes a different monochrome image sensor. It may be composed of a multi-plate image sensor that leads. The image sensor unit 1008 can generate image data of XYZ tristimulus values. However, the image sensor unit 1008 can generate spectral image data, thereby enabling more accurate color measurement, and thus video. This is desirable for accurate color reproduction of an image displayed on the display surface 112.

  A plurality of functions of the control unit 1004 will be described. As a first function, the control unit 1004 has a function of controlling the imaging operation of the image sensor unit 1008, processing a signal output from the image sensor unit 1008, and outputting the processed signal to the display control unit 1006. . A signal output from the control unit 1004 is output to the display device 1002 via the display control unit 1006, whereby an image formed on the imaging surface of the image sensor unit 1008 by the objective lens unit 134 is a so-called through image. It is displayed on the display device 1002 as (live view). At this time, the control unit 1004 detects the image formation state of the image formed on the imaging surface of the image sensor unit 1008 by the objective lens unit 134 by processing the signal output from the image sensor unit 1008, and the out-of-focus state. If it is determined that the objective lens unit 134 is in focus, the automatic focus adjustment mechanism 138A is controlled to drive the objective lens unit 134 so as to be in focus. Further, as a second function, the control unit 1004 detects an operation of the user interface unit 132 by the photographer, controls the remote controller 130B to operate in an operation mode according to the operation, and controls from the image sensor unit 1008. A video signal, a control signal, and the like based on the output signal are transmitted to the video signal processing device 120B via the transmission control unit 146A and the signal transmission unit 148.

  The internal configuration of the color conversion parameter calculation unit 125A will be described with reference to FIG. The color conversion parameter calculation unit 125A is different from the color conversion parameter calculation unit 125 included in the video display systems according to the first and second embodiments in that the color conversion parameter calculation unit 125A includes an image recognition / measurement value extraction unit 1100. The image recognition / measurement value extraction unit 1100 inputs the video signal transmitted from the remote controller 130 </ b> B via the signal reception unit 121.

  Here, FIG. 12A illustrates an example of a test pattern displayed on the video display surface 112 when the observer operates the user interface unit 132 and the video signal processing apparatus 120B is set to the calibration mode. Unlike the test patterns 401, 402,..., 407 shown in FIG. 4, the test pattern 1200 shown in FIG. 12A includes a plurality of test patterns in one display image. As an example, primary color (for example, R, G, B) measurement color patches 1202, 1204, 1206, offset measurement color patch 1212 of the monitor device 110, high contrast patterns 1208, 1210 for easy focus adjustment, gradation A characteristic measurement pattern 1214 and the like are included in one display image.

  The pixel values (R, G, B) of the pixels forming the color patches 1202, 1204, 1206 are (255, 0, 0), (0, 0) when the monitor device 110 is a 24-bit color RGB display device. 255, 0), (0, 0, 255). Accordingly, the R, G, and B color patches 1202, 1204, and 1206 having the highest saturation can be displayed. The pixel values (R, G, B) of the pixels forming the color patch 1212 can be (0, 0, 0). Thereby, the dark display level at the time of no signal can be reproduced by the color patch 1212. As an example of the high contrast patterns 1208 and 1210 that facilitate the focus adjustment by the automatic focus adjustment mechanism 138A, vertical stripes and horizontal stripes as shown in FIG. Alternatively, the pattern forming region is divided into two, one is white, ie (R, G, B) = (255, 255, 255) and the other is black, ie (R, G, B) = (0, 0, 0), or a checkerboard pattern may be formed by alternately arranging white and black rectangular patterns. The gradation characteristic measurement pattern 1214 may be an achromatic gradation pattern or an array of a plurality of patches having a predetermined gradation interval, or may have a gradation pattern or a predetermined gradation interval for each of R, G, and B. A plurality of patches may be arranged independently.

  When the observer operates the user interface unit 132 of the remote controller 130B to set the calibration mode, a test pattern image as shown in FIG. 12A is displayed on the image display surface 112. By observing the display device 1002 provided in the remote controller 130B, the observer directs the objective lens unit 134 toward the monitor device 110, whereby the entire monitor device 110 on which the test pattern is displayed as illustrated in FIG. 12B. The video 1216 is captured by the remote controller 130B and displayed on the display device 1002, and a video signal including the video 1216 is sent to the video signal processing device 120B. The observer operates the visual field adjustment mechanism 140 of the remote controller 130B to zoom in, and directs the objective lens unit 134 toward the reference white plate 114, whereby the entire image of the reference white plate 114 is captured by the remote controller 130B. A video signal including a video is sent to the video signal processing device 120B.

  Returning to the description of the color conversion parameter calculation unit 125A, the image recognition / measurement value extraction unit 1100 performs image processing on the video signal transmitted from the remote controller 130B as described above, and uses the image recognition technique to perform the color patch 1202. 1204, 1206, 1212, the image portion of the gradation characteristic measurement pattern 1214, or the image portion of the reference white plate 114, and the monitor display characteristic or the observation environment illumination light characteristic based on the extracted image portion. Measure. Among the obtained measurement results, the observation environment illumination light characteristic is output and stored in the observation environment illumination light characteristic information storage unit 206, and the monitor display characteristic is output and stored in the monitor display characteristic information storage unit 212.

  As described above, in the video display system 100B according to the third embodiment, each time a plurality of test patterns are sequentially switched and displayed as described in the first or second embodiment, an observer is displayed. It is not necessary to perform an operation for collimating the eyepiece 150 with the eye and performing a color measurement, and it is only necessary to perform a single measurement operation. In addition, since the remote controller 130B can be operated while watching the video displayed on the display device 1002, the calibration mode can be executed without performing an operation such as placing an eye on the eyepiece. .

  FIG. 13A schematically shows an observation environment illumination light characteristic measurement command transmission procedure executed by the remote controller 130B, and FIG. 13B schematically shows a monitor display characteristic measurement processing procedure executed by the remote controller 130B. FIG. FIG. 14A shows the processing procedure of the observation environment illumination light characteristic measurement mode (first calibration mode) executed by the video signal processing device 120B, and FIG. 14B shows the video signal processing device 120B. 5 is a flowchart schematically showing a processing procedure of a mode for measuring monitor display characteristics (second calibration mode) executed in step S2. Similarly to the other embodiments, the remote controller 130B and the video signal processing device 120B execute the calibration mode in cooperation with each other. Therefore, the remote controller 130B will be described below with reference to both FIG. 13 and FIG. Processing performed in both the video signal processing apparatus 120B and the video signal processing apparatus 120B will be described in parallel.

  In step S1301, the remote controller 130B detects that the observer has pressed the first calibration mode execution start switch of the user interface unit 132, and in step S1302, transmits a first calibration mode start command to the video signal processing device 120B. . In subsequent S1303, the remote controller 130B turns on the display device 1002 so that an image can be displayed. Thereafter, in S1304, the remote controller 130B determines whether or not the observer has operated the reference white board image capture (capture) switch in the user interface unit 132, and polls until this determination is affirmed.

  In S1401, the video signal processing apparatus 120B receives the first calibration mode execution start command issued from the remote controller 130B as described above. In S1402, the video signal processing device 120B displays the operation guidance for the reference white plate video capture. That is, the video signal processing device 120B switches the display video switching unit 124 so that the test pattern video generated by the test pattern video generation unit 122, the operation guidance, and the like are displayed on the video display surface 112, and The user interface unit is operated after the visual field adjustment mechanism 140 is operated so that the objective lens unit 134 of the remote controller 130B faces the reference white plate 114 and the image of the reference white plate 114 is displayed in the display range of the display device 1002. An operation guidance for pressing the video capture switch in 132 is displayed. At this time, the operation guidance displayed on the video display surface 112 is preferably a display with reduced luminance. The reason is the same as that described in the first embodiment, and when capturing an image of the reference white plate 114, measurement with high accuracy is performed to suppress the influence of light emitted from the image display surface 112. This is because it is desirable above.

  The observer operates the remote controller 130B according to the above-described operation guidance and presses the video capture switch in the user interface unit 132. Then, the determination in S1304 is affirmed, and in S1305, the remote controller 130B controls the automatic focus adjustment mechanism 138A to drive the objective lens unit 134 so that the image of the reference white plate 114 becomes sharp. In subsequent S1306, the remote controller 130B captures the video of the reference white plate 114, and in S1307, outputs the video signal of the reference white plate 114 to the video signal processing device 120B via the transmission control unit 146A and the signal transmission unit 148. In step S1308, the display device 1002 is turned off, and the first calibration mode processing ends.

  In S1403, the video signal processing apparatus 120B inputs the video signal of the reference white plate 114 described above via the signal reception unit 121A, and in S1404, the image signal processing apparatus 120B uses the image recognition technique to reflect the light reflected by the reference white plate 114. The illumination light characteristics of the observation environment are obtained from the spectral characteristics. In S1405, the video signal processing device 120B stores the observation environment illumination light characteristic information based on the observation environment illumination light characteristic in the observation environment illumination light characteristic information storage unit 206. The video signal processing device 120B calculates an illumination conversion parameter in S1406 based on the input illumination light spectrum information and the input spectral sensitivity characteristic information extracted from the input video profile information and the observation environment illumination light characteristic information stored in S1405. In step S1407, the illumination conversion parameter is stored in the illumination conversion parameter storage unit 210, and the process of the first calibration mode is completed.

  Next, the second calibration mode will be described with reference to FIGS. 13B and 14B.

  In S1310, the remote controller 130B detects that the observer has pressed the second calibration mode execution start switch of the user interface unit 132, and transmits a second calibration mode execution start command to the video signal processing device 120B in S1311. To do. In subsequent S1312, the remote controller 130B turns on the display device 1002 so that an image can be displayed. Thereafter, in S1313, the remote controller 130B determines whether or not the observer has operated the monitor test pattern video capture switch in the user interface unit 132, and performs polling until this determination is positive.

  In S1410, the video signal processing apparatus 120B receives (inputs) the second calibration mode execution start command issued from the remote controller 130B as described above. In S1411, the video signal processing device 120B displays operation guidance for test pattern video capture. That is, the video signal processing device 120B switches the display video switching unit 124 so that the test pattern video generated by the test pattern video generation unit 122, the operation guidance, and the like are displayed on the video display surface 112, and The field of view is such that the objective lens unit 134 of the remote controller 130B is directed to the monitor device 110 and the video (test pattern) of the video display surface 112 of the monitor device 110 is displayed over the display range of the display device 1002 of the remote controller 130B. After operating the adjustment mechanism 140, an operation guidance for pressing the video capture switch in the user interface unit 132 is displayed. In step S <b> 1412, the video signal processing device 120 </ b> B outputs the video signal of the test pattern 1200 as described above with reference to FIG. 12A to the monitor device 110. As a result, an image of the test pattern is displayed on the image display surface.

  The observer operates the remote controller 130B according to the above-described operation guidance and presses the video capture switch in the user interface unit 132. Then, the determination in S1313 is affirmed, and in S1314, the remote controller 130B controls the automatic focus adjustment mechanism 138A to drive the objective lens unit 134 so that an image obtained by imaging the test pattern displayed on the video display surface 112 becomes sharp. To do. In the subsequent S1315, the remote controller 130B captures the video of the test pattern (for example, the video as shown in FIG. 12B), and in the subsequent S1316, the video signal processing device 120B via the transmission control unit 146A and the signal transmission unit 148. In step S1317, the display device 1002 is turned off, and the second calibration mode processing ends.

  In step S1413, the video signal processing apparatus 120B inputs the video signal of the above-described test pattern via the signal receiving unit 121A. In step S1414, the video signal processing apparatus 120B analyzes the color of each color patch image using image recognition technology, and monitors Obtain the display characteristics. In S1415, the video signal processing device 120B stores the monitor display characteristic information based on the monitor display characteristic in the monitor display characteristic information storage unit 212. In S1416, the video signal processing device 120B calculates a monitor color correction parameter based on the monitor display characteristic information stored in the monitor display characteristic information storage unit 212. In S1417, the monitor color correction parameter is stored in the monitor color correction parameter. The data is stored in the unit 222, and the processing of the second calibration mode is finished.

  Based on the illumination conversion parameter and the monitor color correction parameter obtained by executing the first and second calibration modes described above, the video signal processing device 120B performs a color conversion process on the input video signal to monitor the monitor device 110. Output to.

  As described above, in the video display system according to the third embodiment, the observer places an eye on the eyepiece and collimates the remote controller toward the measurement target, that is, a so-called eye level. This eliminates the need for setting up the remote controller and increases the degree of freedom in handling the remote controller. In addition, a plurality of types of test patterns (color patches, etc.) displayed on the video display surface 112 of the monitor device are collectively fetched, and each test pattern is extracted by image recognition technology. Since the monitor display characteristics can be obtained, the operation required by the observer is simplified and the time required for calibration is shortened.

  The example in which the first calibration mode and the second calibration mode are executed independently of each other has been described above. However, in response to the observer pressing the calibration mode execution start switch in the user interface unit 132. These first and second calibration modes may be executed continuously.

  Further, the visual field adjustment mechanism 140 can be omitted by increasing the number of pixels of the image sensor unit 1008. In other words, the image is displayed on the video display surface 112 of the monitor device 110 from the video based on the video signal transmitted from the remote controller 130B by using a technique of electronic trimming, also referred to as electronic zoom or digital zoom. It is possible to extract the video portion of the test pattern. By doing in this way, the lens, lens moving mechanism, etc. which comprise the visual field adjustment mechanism 140 can be omitted, which contributes to the miniaturization of the remote controller 130B. In addition, since the visual field adjustment operation is not necessary, the observer can perform calibration more easily.

-Fourth embodiment-
FIG. 15 is a block diagram showing an overall configuration of a video display system 100C according to the fourth embodiment of the present invention. In the video display system 100B shown in FIG. 15, the same components as those of the video display systems 100, 100A, and 100B according to other embodiments are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on the difference from the form. In addition, components that are functionally similar are denoted by the same reference numerals as those shown in the drawings for explaining other embodiments, with the same numbers added.

  In the third embodiment, as shown in FIG. 10, the remote controller 130B has a display device 1002, and an image captured by the image sensor unit 1008 is displayed on the display device 1002. The example in which the objective lens unit 134 of the remote controller 130B is directed to the measurement target while viewing the video has been described. On the other hand, in the fourth embodiment, the video display control unit 1006 and the display device 1002 that the remote controller 130C has in the remote controller 130B in the third embodiment are omitted. Instead, a video signal based on the video captured by the image sensor unit 1008 is transmitted from the remote controller 130C to the video signal processing device 120C, and a through image (live view) 1502 based on the video signal is displayed on the video display surface 112. Is displayed.

  In order to implement the configuration as described above, the remote controller 130C processes the signal output from the image sensor unit 1008 when the calibration mode is executed by the control unit 1004, and the transmission control unit 146A and the signal transmission unit 148 are processed. The video signal is sent to the video signal processing device 120C.

  The video signal processing device 120C receives the video signal from the remote controller 130C via the signal receiving unit 121A. The video superimposing unit 1500 performs processing for superimposing the video based on the video signal on the test pattern video generated by the test pattern video generating unit 122A, and the processed video signal is monitored via the display video switching unit 124. It is output to the device 110.

  The observer takes the first and second calibrations described in the third embodiment while viewing the through image (live view) 1502 captured by the image sensor unit 1008 of the remote controller 130C and displayed on the video display surface 112. The remote controller 130C can be operated in the communication mode.

  The first and second calibration mode processes performed by the remote controller 130C are the display-on process in S1303 and S1312, and the display in S1308 and S1317 in the flowcharts shown in FIGS. 13 (a) and 13 (b). The apparatus is the same as the third embodiment except that the apparatus off process is changed to the process described below. That is, in the fourth embodiment, the process of turning on the display device in S1303 and S1312 in FIG. 13 is replaced with a process of starting sending the video signal of the video captured by the image sensor unit 1008 to the video signal processing device 120C. The display device off process in steps S1308 and S1317 is replaced with the video signal transmission end process described above.

  The processing in the first and second calibration modes performed by the video signal processing apparatus 120C is a through image (live view) based on the video signal transmitted from the remote controller 130C during the processing of the first and second calibration modes. ) 1502 is displayed on the video display surface 112, and is the same as that shown in the flowcharts shown in FIGS. 14 (a) and 14 (b).

  According to the fourth embodiment, since it is not necessary to provide the remote controller 130C with the display device 1002 as shown in FIG. 10, the remote controller 130C can be configured to be small and light, and the remote controller The remote controller 130B used in the third embodiment is also advantageous in that the battery life of 130C can be extended.

-Fifth embodiment-
FIG. 16 is a block diagram showing an overall configuration of a video display system 100D according to the fifth embodiment of the present invention. In the video display system 100D shown in FIG. 16, the same components as those of the video display systems 100, 100A, 100B, and 100C according to other embodiments are denoted by the same reference numerals, and the description thereof is omitted. The difference from the embodiment will be mainly described. In addition, components that are functionally similar are denoted by the same reference numerals as those shown in the drawings for explaining other embodiments, with the same numbers added.

  In the fifth embodiment, the remote controller 130C is replaced with a wireless keyboard 130D in the fourth embodiment. The observer can start execution of the first and second calibration modes by operating the user interface unit 132A. When the first and second calibration modes are executed, the observer looks at the through lens (live view) 1502 displayed on the video display surface 112 and moves the objective lens unit 134 to the reference white plate 114, the video display surface. The field of view adjustment mechanism 140 is operated toward 112 to adjust the field of view of the objective lens unit 134. The objective lens unit 134 is configured to be able to change the orientation with respect to the wireless keyboard 130D main body, and the observer can change the orientation so that the tip of the objective lens unit 134 faces the monitor device 110. Alternatively, the objective lens unit 134 may have a configuration in which the orientation cannot be changed with respect to the wireless keyboard 130D, and the objective lens unit 134 may be directed toward the monitor device 110 by moving the entire wireless keyboard 130D.

  The signal transmission unit 148 built in the wireless keyboard 130D can be configured to be able to send commands and video data using infrared light or radio waves. When radio waves are used, wireless LAN, wireless USB, or Bluetooth (registered trademark) technology can be used.

  When the observer operates the user interface unit 132A when the image of the measurement object is captured in the full field of view, the focus adjustment of the objective lens unit 134 is automatically performed, the image of the measurement object is captured, and the video signal is captured. It is sent to the video signal processing device 120C.

  In the fifth embodiment, an example in which a wireless keyboard is used as a remote controller has been described. However, other devices such as a mouse can also be used. This will be described with reference to FIG.

  FIG. 17 shows a wireless mouse configured to execute the calibration mode provided in the remote controller 130C described in the fourth embodiment and the remote controller (wireless keyboard) 130D described in the fifth embodiment. It is a figure explaining the example with which 130E is equipped. FIG. 17B is a top view of the wireless mouse 130E, and FIG. 17A is a diagram conceptually showing a cross section AA of FIG. 17B. The visual field adjustment mechanism 140A is connected to the user interface unit 132B, and is configured so that an observer can adjust the angle of view of the objective lens unit 134 by operating the user interface unit 132B. For example, the zoom-in operation may be performed when the wheel of the user interface 132B is rotated forward, and the zoom-out operation may be performed when the wheel is rotated backward.

  The wireless mouse 130E is usually used by moving on a mouse pad or the like. When the execution of the first and second calibration modes is started, the user interface unit is operated, and the calibration mode execution start button is clicked from the graphical user interface displayed on the video display surface 112. Next, in accordance with the guidance display displayed on the video display surface 112, the observer directs the live video displayed on the video display surface 112 while directing the bottom surface of the wireless mouse 130E toward the reference white plate 114 or the video display surface 112 (FIG. 16). The user interface unit 132B is operated while seeing (see) to adjust the visual field. The user interface unit 132 is further operated when the image of the measurement object is captured with full field of view. In accordance with this operation, the focus adjustment of the objective lens unit 134 is automatically performed, the video of the measurement object is captured, and the video signal is sent to the video signal processing device 120C.

  The wireless mouse 130E described above can also be configured to send commands and video data using infrared light or radio waves.

  According to the video display system according to the fifth embodiment, when the video signal processing device 120C is configured by a computer or the like, a conventional user interface, that is, a configuration for executing a calibration mode on a keyboard, a mouse, or the like. By incorporating it, it is not necessary to take out a remote controller or the like when the calibration mode is executed, so that a smoother operation can be performed. In addition, by using a wireless keyboard, a wireless mouse, or the like, the observation environment illumination light characteristic and the monitor display characteristic can be obtained from the position where the observer observes the video, so that it is the same as the video display system according to the other embodiments. In addition, the above-described calibration can be easily performed, and it is possible to observe an image with the most suitable color reproduction according to the viewing angle of the monitor device.

  The video signal processing technology according to the present invention is applicable to a system for observing (appreciating) video based on a video signal distributed via cable broadcasting or normal television broadcasting via cable television, or the Internet. The present invention is also applicable to a system that reproduces and observes video recorded on a medium such as an optical disk, and a system that includes a personal computer and a monitor device connected to the personal computer.

1 is a block diagram illustrating a schematic configuration of a video display system according to a first embodiment of the present invention. It is a block diagram which shows roughly the example of an internal structure of a color conversion parameter calculation part. It is a block diagram which shows roughly the example of an internal structure of a color conversion process part and a monitor color conversion part. It is a figure which illustrates the test pattern displayed on a monitor apparatus. It is a schematic flowchart explaining the process sequence of the calibration mode performed with a remote controller. It is a schematic flowchart explaining the process sequence of the calibration mode performed with a video signal processing apparatus. It is a block diagram explaining the schematic structure of the video display system which concerns on the 2nd Embodiment of this invention. It is a schematic flowchart explaining the process procedure of the calibration mode performed with a remote controller, (a) shows the process procedure of 1st calibration mode, (b) shows the process procedure of 2nd calibration mode, respectively. It is a schematic flowchart explaining the process procedure of the calibration mode performed with a remote controller, (a) shows the process procedure of 1st calibration mode, (b) shows the process procedure of 2nd calibration mode, respectively. It is a block diagram explaining the schematic structure of the video display system which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows roughly the example of an internal structure of a color conversion parameter calculation part. FIG. 12A is a diagram illustrating a test pattern displayed on the monitor device, and FIG. 12B is a diagram illustrating a video captured by the remote controller. It is a schematic flowchart explaining the process procedure of the calibration mode performed with a remote controller, (a) shows the process procedure of 1st calibration mode, (b) shows the process procedure of 2nd calibration mode, respectively. It is a schematic flowchart explaining the process procedure of the calibration mode performed with a remote controller, (a) shows the process procedure of 1st calibration mode, (b) shows the process procedure of 2nd calibration mode, respectively. It is a block diagram explaining the schematic structure of the video display system which concerns on the 4th Embodiment of this invention. It is a block diagram explaining the schematic structure of the video display system which concerns on the 5th Embodiment of this invention. It is a block diagram explaining the example which comprises a remote controller with a mouse | mouth in the video display system which concerns on the 5th Embodiment of this invention.

Explanation of symbols

100, 100A, 100B, 100C, 100D ... Video display system 110 ... Monitor device 112 ... Video display surface 114 ... Reference white plate 120, 120A, 120B, 120C ... Video signal processor 121 ... Signal receiver 122 ... Test pattern video generation Unit 124 ... display video switching unit 125, 125A ... color conversion parameter calculation unit 126 ... color conversion unit 130, 130A, 130B, 130C, 130D, 130E ... remote controller 132, 132A, 132B ... user interface unit 134 ... objective lens unit 136 ... Beam splitter 138, 138A ... Focus adjustment mechanism 140, 140A ... Field adjustment mechanism 142 ... Color sensor unit 144 ... Sensor control unit 146 ... Transmission control unit 148, 148A ... Signal transmission unit 150 ... Eyepiece unit 2 2… Input video profile information storage unit 204… Input γ correction data storage unit 206… Observation environment illumination light characteristic information storage unit 208… Illumination conversion parameter calculation unit 210… Illumination conversion parameter storage unit 212… Monitor display characteristic information storage unit 214… Monitor color correction parameter calculation unit 216 Offset correction data calculation unit 218 Tone curve correction data calculation unit 220 Color conversion data calculation unit 222 Monitor color correction parameter storage unit 224 Offset correction data storage unit 226 Tone curve correction data storage Unit 228 ... color conversion data storage unit 302 ... color conversion processing unit 304 ... monitor color conversion unit 306 ... color separation calculation units 308, 312 ... look-up table 310 ... illumination conversion processing units 401, 402, 403, 404, 405, 406, 407, 1 00 ... Test pattern 410, 1208, 1210 ... High contrast pattern 702 ... Illumination sensor unit 704 ... Illumination sensor control unit 1002 ... Display device 1004 ... Control unit 1008 ... Image sensor unit 1100 ... Image recognition / measurement value extraction unit 1202, 1204, 1206, 1212 ... Color patch 1214 ... Tone characteristic measurement pattern 1216 ... Video 1500 ... Video superimposing unit 1502 ... Through image (live view)

Claims (12)

A remote control unit operable from a video observation position, which is a position where an observer observes a video displayed on a video display surface of a monitor device, wherein a color sensor and an image of an object to be measured are received on a light receiving surface of the color sensor An objective optical system configured to be formed above, and a measurement range confirmation unit configured to allow the observer to visually observe a spatial range of the measurement object captured by the objective optical system and the color sensor. Having a remote control unit;
A test pattern display unit configured to be able to display a test pattern including a color target on the video display surface;
The color sensor measures the color of the color target from the image of the test pattern formed on the light receiving surface by directing the objective optical system to the test pattern displayed on the video display surface by the observer A monitor display characteristic deriving unit for deriving a monitor display characteristic of the monitor device based on a result;
Video that derives color conversion parameters based on the monitor display characteristics, performs color conversion processing based on the color conversion parameters for the input video signal, and outputs the video signal after color conversion processing to the monitor device A video display system comprising: a signal processing unit.   When the monitor display characteristic deriving unit derives the monitor display characteristic of the monitor device, the monitor display characteristic deriving unit further includes a measurement range adjusting unit for measuring only the color target portion included in the test pattern. The video display system according to claim 1. An observation environment illumination light measurement unit that measures color characteristics of observation environment illumination light that illuminates an observation environment that is an environment surrounding the monitor device and the observer; and a color of the observation environment illumination light in the observation environment illumination light measurement unit An observation environment illumination light characteristic deriving unit for deriving an observation environment illumination light characteristic that is a color characteristic of the observation environment illumination light based on a result of measuring the characteristics;
The video signal processing unit derives the color conversion parameter based on the observation environment illumination light characteristic in addition to the monitor display characteristic, and performs color conversion processing based on the color conversion parameter for the input video signal. The video display system according to claim 1, wherein the video signal after color conversion processing is output to the monitor device.   The observation environment illumination light characteristic measurement unit is configured by a standard reflector disposed in the vicinity of the monitor device and the remote control unit, and the observer directs the objective optical system to the standard reflector. The said color sensor is comprised so that measurement of the characteristic of the observation environment illumination light reflected by the said standard reflecting plate from the image of the said standard reflecting plate formed on the said light-receiving surface is possible. Video display system.   The observation environment illumination light characteristic measurement unit is connected to the video signal processing unit, and has an illumination sensor unit configured to receive the observation environment illumination light and to measure a color characteristic of the observation environment illumination light, In response to the observer operating the remote control unit, the video signal processing unit inputs the measurement result of the color characteristic of the observation environment illumination light by the illumination sensor unit from the observation environment illumination light characteristic measurement unit. The video display system according to claim 3, wherein the video display system is configured as follows.   A test pattern video signal for displaying the test pattern on the video display surface is output from the video signal processing unit to the monitor device in response to the observer operating the remote control unit. The video display system according to any one of claims 1 to 5, wherein The color sensor is a two-dimensional image sensor,
The measurement range confirmation unit includes a sensor video signal generation unit that generates a sensor video signal from a signal output from the color sensor, and a sensor that can display a sensor video based on the sensor video signal. The video display system according to claim 1, further comprising a video display unit. The color sensor is a two-dimensional image sensor,
The measurement range confirming unit generates a sensor video signal from a signal output from the color sensor, and displays a sensor video based on the sensor video signal on the video display surface of the monitor device. The video display system according to claim 1, further comprising: a sensor video signal sending unit that sends the sensor video signal to the video signal processing unit.   The objective optical system further includes a focus adjusting device that adjusts a focal position of the objective optical system so that light transmitted through the objective optical system is focused on the light receiving surface of the color sensor. The video display system according to any one of claims 1 to 8.   The video display system according to claim 9, wherein a high-contrast pattern for facilitating adjustment of the focus position by the focus adjustment device is provided in the test pattern.   The video display system according to any one of claims 1 to 10, wherein the remote control unit includes a wireless keyboard or a wireless mouse. The color sensor is a two-dimensional image sensor,
A sensor video signal generation unit that generates a sensor video signal from a signal output from the color sensor;
Processing the sensor video signal, extracting an image part of the color target or the standard reflector from an image of the measurement object captured by the objective optical system and the color sensor, and extracting the extracted image part The video display system according to claim 4, further comprising an image recognition processing unit that analyzes and measures the color of the color target.

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