JP2004007430A - Image adjustment device for projector and image adjustment method for image display device - Google Patents

Abstract

An image adjusting apparatus for a projector capable of grasping a γ characteristic with high speed and high accuracy and generating correction data in a short time is provided.
An image adjustment device of a projector includes: a projection surface for projecting a projection image of the projector; a reference gradation image generation unit configured to generate a plurality of reference gradation images serving as adjustment references on the projection surface; Image signal input means 41 for inputting image signals including tone signals corresponding to the plurality of reference tone images and causing the projector 100 to be adjusted to simultaneously display the plurality of tone images; An image capturing unit that captures a plurality of gradation images projected by the projector 100 simultaneously as image data, an image processing unit that performs image processing based on the captured image data, and And correction data generating means 43 for generating image display correction data of the projector 100.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projector including a light source, an electro-optical device that modulates a light beam emitted from the light source according to image information, and a projection optical system that enlarges and projects the modulated light beam modulated by the electro-optical device. The present invention relates to an image adjustment device of a projector that adjusts a projected image, and an image adjustment method of an image display device that adjusts a display image of an image display device including an electro-optical device that forms an optical image based on an input image signal.
[0002]
[Background Art]
In an image display device such as a CRT display, a liquid crystal display, an organic electroluminescence display and a plasma display, and a projection type image display device such as a liquid crystal projector and a projector using a micromirror as a modulation element, an electro-optical device for forming an image. There is an individual difference in the γ characteristic representing the gray scale of the display image with respect to the input voltage to the display.
For this reason, these image display devices generally grasp the γ characteristics of each image display device before product shipment, so that each image display device can display a certain gradation image in accordance with an input image signal. After gamma correction, it is shipped.
[0003]
Here, γ correction of a projector, which is a projection type image display device, is conventionally performed by inputting a predetermined gradation signal stepwise to a projector to be adjusted and projecting a projected image based on each gradation signal. It measures with a point sensor such as a colorimeter, and based on the measurement result, calculates how much input voltage is applied to the electro-optical device to obtain a gradation image that matches the inputted gradation signal, and calculates the correction data. It was done by generating.
[0004]
The obtained correction data is recorded and stored in a memory of the projector as a look-up table in which the gradation signal and the input voltage value at that time are associated.
During operation of the projector, when a certain gradation signal is input, the MPU of the projector searches a look-up table in a memory to find an input voltage value corresponding to the gradation signal. By inputting the image to the device and displaying the image, an appropriate display image corresponding to the gradation signal can be formed.
[0005]
[Problems to be solved by the invention]
However, grasping the γ characteristic using the point sensor described above involves measuring a projection image based on a predetermined gradation signal with a point sensor, generating correction data, switching to the next gradation signal, and measuring with a point sensor. Therefore, there is a problem that it takes time to grasp the γ characteristic and generate all the correction data. Specifically, in order to grasp the γ characteristic, it is necessary to compare the input gradation signal with the measurement result of the point sensor at least in about 33 gradations. Must be done.
[0006]
In the case of an image display apparatus that forms a projection image by modulating a light beam emitted from a light source such as a projector, a metal halide lamp, a high-pressure mercury lamp, or the like is used as a light source. May change, and the projected image at the time of inputting each gradation signal is affected by the light emitting state of the light source. Therefore, it cannot be said that the comparison is performed in the same row for each gradation, and the γ characteristic cannot be grasped with high accuracy. There's a problem.
[0007]
An object of the present invention is to provide an image adjustment device for a projector and an image adjustment method for an image display device, which can grasp the γ characteristic at high speed and with high accuracy and can generate correction data in a short time. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an image adjusting apparatus for a projector according to the present invention includes a light source, an electro-optical device that modulates a light beam emitted from the light source according to image information, and a modulation device that is modulated by the electro-optical device. What is claimed is: 1. An image adjustment device for a projector, comprising: a projection optical system for enlarging and projecting a light beam; and a projection surface for projecting the projection image of the projector, and a plurality of adjustment reference points on the projection surface. A reference gradation image generating means for generating a reference gradation image, and an image signal including gradation signals corresponding to the plurality of reference gradation images and causing the projector to be adjusted to simultaneously display the plurality of gradation images. Image signal input means for inputting, and image capture for capturing the plurality of reference tone images and the plurality of tone images projected by the projector as image data Image processing means for performing image processing based on image data captured by the image capturing means; and image display correction data for the projector based on a result of the image processing performed by the image processing means. And a correction data generating means.
[0009]
According to this aspect of the invention, the plurality of reference gradation images and the plurality of gradation images projected by the projector can be simultaneously captured by the image capturing unit. The gamma characteristic can be grasped by performing image processing on the resulting gradation image by the image processing means. Therefore, it is not necessary to switch the gradation image and to perform the measurement by the point sensor for each gradation image, and it is possible to grasp the γ characteristic of the projector at a high speed.
[0010]
Further, since the plurality of projected gradation images are simultaneously captured by the image capturing means, the comparison between the plurality of gradation images and the plurality of reference gradation images can be performed without being affected by light emission variations of the light source. By doing so, the γ characteristics can be grasped with high accuracy.
Since the γ characteristic can be grasped at high speed and with high accuracy in this way, the correction data can be generated in a short time by the correction data generating means.
[0011]
In the above, the above-described correction data generating means is input to the electro-optical device based on the difference between each gradation image projected by the gradation signal corresponding to each reference gradation image and the reference gradation image. Preferably, the input signal is corrected.
Here, the input signal is configured as a drive voltage signal of an optical element included in the electro-optical device.
By correcting the input signal in this manner, the projected grayscale image can be made closer to the reference grayscale image. A gradation image can be displayed.
[0012]
Further, when the projector to be adjusted has a correction data storage unit that records and stores the correction data generated by the correction data generation unit, the image adjustment apparatus writes the generated correction data into the correction data storage unit. Preferably, a data writing means is provided.
By providing such correction data writing means, the generated correction data can be automatically written into the storage unit of the projector, so that the image adjustment of the projector can be performed at higher speed.
[0013]
Further, the image capturing means described above includes a two-dimensional image sensor capable of imaging a predetermined area of the projection surface, and a signal conversion unit that converts an image signal captured by the two-dimensional image sensor into a signal compatible with a computer. It is preferable to have
By performing image capturing using such a two-dimensional image sensor, a plurality of gradation images and a plurality of reference gradation images can be simultaneously captured. Then, the captured image is converted into a digital signal suitable for a computer by the signal conversion unit, so that digital image processing is performed by the image processing unit, and generation of correction data can be simplified.
[0014]
The plurality of reference gradation images described above can be configured as a so-called gray scale in which a plurality of reference gradation images are continuously formed, and the reference gradation image generation unit displays the gray scale as an image on the projection surface. However, it is preferable to include a reference scale previously formed on the projection surface by printing or the like.
By configuring as a reference scale in this way, the reference scale is always displayed on the projection surface, so that comparison with a plurality of gradation images projected by the projector can be easily performed, and the apparatus structure It does not invite complication.
[0015]
Further, according to the image adjustment method of the image display device of the present invention, the image adjustment method of the image display device that adjusts the display image of the image display device including the electro-optical device that forms the optical image based on the input image signal An image signal including a gradation signal corresponding to a plurality of reference gradation images as an adjustment reference is input to an image display device to be adjusted, and the plurality of gradation images are simultaneously displayed on the image display device. Causing the plurality of reference gradation images and the displayed plurality of gradation images to be simultaneously captured as image data; performing image processing based on the captured image data; and Generating correction data for image display of the image display device.
According to the present invention as described above, the same operations and effects as those described above can be obtained.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(1) Structure of projector to be adjusted
(1-1) Structure of optical system of projector
FIG. 1 shows the structure of a projector 100 to be adjusted by an image adjusting apparatus for a projector according to the present invention. The projector 100 includes an integrator illumination optical system 110, a color separation optical system 120, a relay optical system 130, an electro-optical device 140, a cross dichroic prism 150 serving as a color combining optical device, and a projection lens 160.
[0017]
The integrator illumination optical system 110 includes a light source device 111 including a light source lamp 111A and a reflector 111B, a first lens array 113, a second lens array 115, a reflection mirror 117, and a superposition lens 119. The light beam emitted from the light source lamp 111A is aligned in the emission direction by the reflector 111B, is divided into a plurality of partial light beams by the first lens array 113, and is bent by 90 ° in the emission direction by the return mirror. An image is formed near 115. Each of the partial light beams emitted from the second lens array 115 is incident such that the central axis (principal ray) thereof is perpendicular to the incident surface of the subsequent superimposing lens 119, and a plurality of partial light beams emitted from the superimposing lens 119. The light flux is superimposed on the three liquid crystal panels 141R, 141G, and 141B constituting the electro-optical device 140.
[0018]
The color separation optical system 120 includes two dichroic mirrors 121 and 122 and a reflection mirror 123. The plurality of partial light beams emitted from the integrator illumination optical system 110 by these mirrors 121, 122 and 123 are changed to red and red. It has a function of separating into three color lights of green and blue.
The dichroic mirror 121 disposed at the front stage of the optical path has a characteristic of reflecting light having a wavelength in a red light region and transmitting light having a wavelength in a green light region and a blue light region. Has a characteristic of reflecting only light having a wavelength of? And transmitting light having a wavelength in the blue light region.
The relay optical system 130 includes an incident-side lens 131, a relay lens 133, and reflection mirrors 135 and 137, and has a function of guiding color light, for example, blue light B, separated by the color separation optical system 120 to the liquid crystal panel 141B. Have.
[0019]
The electro-optical device 140 includes three liquid crystal panels 141R, 141G, and 141B, each using, for example, a polysilicon TFT as a switching element. Each of the color lights separated by the color separation optical system 120 is The three liquid crystal panels 141R, 141G, and 141B modulate according to image information to form an optical image.
The cross dichroic prism 150 serving as the color combining optical system forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 141R, 141G, and 141B. The color image synthesized by the cross dichroic prism 150 is emitted from the projection lens 160 and is enlarged and projected on a screen.
[0020]
(1-2) Structure of signal processing system of projector
The projector 100 having the above-described optical system is provided with input terminals of various signal formats. More specifically, the projector 100 is provided with a composite signal input terminal such as a television NTSC system, an RGB signal input terminal such as a computer, and a component signal input terminal such as a high-definition television or a DVD. Is processed by the signal processing system 170 shown in FIG.
[0021]
The signal processing system 170 of the projector 100 includes a composite signal input terminal 171 to which a composite signal VIDEO is input, an RGB signal input terminal 172 to which RGB signals RGB are input, a component signal input terminal 173 to which a component signal COMP is input, and A / A D converter 174, an MPU (Micro Processor Unit) 175, a memory 176, a LUT (Look Up Table) 177, and a D / A converter 178 are provided.
[0022]
The A / D converter 174 converts an analog signal input from the signal input terminals 171 to 173 into a digital signal. The A / D converter 174 converts an image gradation supplied as an analog signal into a digitized gradation value. , MPU 175.
The MPU 175 is a section for obtaining an appropriate drive voltage for the liquid crystal panels 141R, 141G, and 141B according to the grayscale value based on the grayscale value from the A / D converter 174. / A converter 178.
[0023]
The memory 176 is composed of a non-volatile memory such as an EEPROM and a flash memory. As will be described in detail later, this storage area associates the input gradation values with the driving voltages of the liquid crystal panels 141R, 141G, and 141B. LUT 177 is set. The LUT 177 is configured to include three types of tables corresponding to the liquid crystal panels 141R, 141G, and 141B.
The D / A converter 178 is a part that converts the drive voltage obtained by the MPU 175 into an analog signal. The converted analog signal is output to the liquid crystal panels 141R, 141G, and 141B, and the liquid crystal panels 141R, 141G, and 141B are , Is driven by this driving voltage.
[0024]
(2) Structure of image adjustment device for projector
FIG. 3 shows a schematic configuration of the image adjustment device 1 according to the embodiment of the present invention.
The image adjustment apparatus 1 grasps the γ characteristic of the projector 100 to be adjusted, generates correction data for projecting an appropriate gradation image according to the gradation of the image signal, and stores the correction data in the memory 176 in the projector 100. This is a device for writing the correction data into the image data, and includes a projection surface 2, a two-dimensional image sensor 3 constituting a capturing unit, and a measurement control device 4.
[0025]
(2-1) Structure of projection surface and image capturing means
The projection surface 2 is configured as a screen that projects a light beam emitted from the projector 100, and a gray scale 21 serving as a reference scale is formed at the center of the projection surface 2 by printing or the like, as shown in FIG. I have.
The gray scale 21 is configured by linearly arranging a plurality of reference gradation images 21A, 21B, 21C, 21D, 21E, and 21F having different gradations, and the reference gradation image 21A is an image having a transmittance of 100%. That is, the white display image and the reference gradation image 21F represent an image having a transmittance of 0%, that is, a black display image. In this example, only six levels of reference gradation images are shown for convenience. However, in actuality, a gray scale of about 33 levels is configured, and 33 levels of reference gradations are imaged and evaluated simultaneously.
[0026]
The two-dimensional image sensor 3 is configured by an area sensor such as a CCD (Charge-Coupled Device) sensor, and is configured to be able to simultaneously capture an image of a predetermined area including the gray scale 21 of the projection surface 2.
The image signal captured by the two-dimensional imaging device 3 is output to the measurement control device 4 via the signal processing means 31, as shown in FIG.
The signal processing unit 31 is a unit that converts an image signal captured by the two-dimensional imaging device 3 so as to be compatible with a computer, and is specifically configured by a video capture board or the like mounted on the back of the computer. You.
The two-dimensional image sensor 3 and the signal processing unit 31 constitute an image capturing unit.
[0027]
(2-2) Structure of measurement control device
The measurement control device 4 analyzes the image captured by the two-dimensional image sensor 3, inputs an image signal including a predetermined gradation signal to the projector 100, and transmits generated correction data to the memory 176 of the projector 100. It is a writing device.
As shown in FIG. 5, the measurement control device 4 is configured as a computer including an arithmetic processing device 4A and a storage device 4B. Although not shown in FIG. 5, the measurement control device 4 includes a keyboard, Input devices such as a mouse and output devices such as a display and a printer are connected.
[0028]
The measurement control device 4 includes an image signal input unit 41, an image processing unit 42, a correction data generation unit 43, and a correction data as a program that operates on an OS (Operating System) that controls the entire device including the arithmetic processing unit 4A. A writing unit 44 is provided.
In the storage device 4B, a gradation value accumulation unit 45 and a correction value accumulation unit 46 are secured in predetermined areas.
[0029]
The image signal input means 41 is a part for inputting an image signal including a plurality of gradation signals corresponding to the reference gradation images 21A, 21B, 21C, and 21D constituting the gray scale 21 shown in FIG. As will be described later in detail, the projector 100 to which the image signal has been input simultaneously displays a plurality of gradation images corresponding to the plurality of gradation signals on the projection surface 2.
The image processing unit 42 is a unit that analyzes the image data input via the signal processing unit 31, and performs pattern matching processing on the image captured by the two-dimensional image sensor 3 to reduce the luminance value. A region to be acquired is determined, and an average luminance value in the region is calculated.
[0030]
The correction data generation unit 43 is a part that grasps the γ characteristic of the projector 100 to be adjusted based on the result of the image processing performed by the image processing unit 42, and generates correction data based on this.
Specifically, the correction data generation unit 43 calculates a deviation in each gradation based on the gradation image projected by the projector 100 and the reference gradation images 21A, 21B, 21C, 21D, 21E, and 21F. Then, a drive voltage value is generated such that there is no difference between the two gradation images, and an LUT recording this drive voltage value for each gradation is generated.
[0031]
The correction data writing unit 44 is a unit that writes the correction data finally generated by the correction data generation unit 43 into the memory 176 of the projector 100 as an LUT 177.
The gradation value accumulating unit 45 is a unit that accumulates a gradation signal input to the projector 100 from the image signal input unit 41 and calibration data of the two-dimensional image sensor 3 when the gray scale 21 is imaged. Stores calibration value data associated with gradation signals corresponding to the reference gradation images 21A, 21B, 21C, 21D, 21E, and 21F constituting the gray scale 21 for each gradation.
The correction value accumulating unit 46 is a unit that accumulates correction values for each gradation image while the γ characteristic of the projector 100 is being acquired by the correction data generating unit 43, and stores an image signal input by the image signal input unit 41. This is a part for storing the included gradation values and the correction values for the gradation values.
[0032]
(3) Image adjustment procedure of the projector
Next, an image adjustment procedure of the projector 100 using the above-described image adjustment device 1 will be described based on a flowchart shown in FIG.
(3-1) When the measurement control device 4 is activated (process S1), as shown in FIG. 7, the light source of the projector 100 is turned on, the gray scale 21 on the projection surface 2 is illuminated, and the two-dimensional image sensor The image of the gray scale 21 captured in 3 is taken into the measurement control device 4 via the signal processing means 31 (process S2). At this time, the projection image from the projector 100 is an image of a so-called all-white pattern having a transmittance of 100%.
[0033]
(3-2) In this state, the image processing means 42 acquires the gradation value L (n) of each reference gradation image of the gray scale 21 (processing S3), and stores the gradation value in the gradation value accumulation means 45. Store L (n).
(3-3) The image processing unit 42 calculates the following equation (1) based on the obtained gradation value L (n) and the original gradation value R (n) of each of the reference gradation images 21A to 21F. ) To calculate the calibration data H (n) (process S4).
[0034]
(Equation 1)
H (n) = R (n) -L (n) (1)
[0035]
(3-4) The image processing unit 42 records and saves the calibration data H (n) corresponding to each calculated gradation value in the gradation value accumulation unit 45 (processing S5), and performs calibration of the measurement control device 4. finish.
(3-5) The image signal input means 41 inputs an image signal including a gradation signal corresponding to the reference gradation image of the gray scale 21 to the projector 100 (processing S6), and as shown in FIG. The gradation images 100A to 100F are projected above the reference gradation images 21A to 21F of the scale 21. Since the projector 100 includes three liquid crystal panels 141R, 141G, and 141B, first, the image signal input unit 41 inputs an image signal to the liquid crystal panel 141G that modulates green light. Further, as shown in FIG. 8, the image projected by the projector 100 is an image of only the gradation images 100A to 100F, and is provided in another area of the projection surface 2, at least a gray scale provided on the projection surface 2. In the areas 21A to 21F, a so-called all-white pattern is projected.
[0036]
(3-6) The image processing unit 42 acquires the projected gradation images 100A to 100F of FIG. 7 via the two-dimensional imaging element 3 and the signal processing unit 31, and obtains the gradation of each of the gradation images 100A to 100F. The value M (n) is obtained, and the obtained gradation value M (n) is output to the correction data generation unit 43.
(3-7) The correction data generation unit 43 stores the obtained gradation value M (n) in the correction value storage unit 46, and stores the calibration data H (n) stored in the gradation value storage unit 45. The correction value N (n) is calculated based on the following equation (2) (step S9), and the calculated correction value is recorded and stored in the correction value storage unit 46 (step S10).
[0037]
(Equation 2)
N (n) = M (n) -H (n) (2)
[0038]
(3-8) When the calculation of the correction value for the liquid crystal panel 141G is completed, the correction value for the liquid crystal panel 141R is calculated in the same procedure, and until the correction values for all the liquid crystal panels 141R, 141G, and 141B are obtained. The procedure from the input of the image signal to the recording of the correction value is repeated (process S11).
(3-9) When all the correction values have been calculated, the correction data generation unit 43 calculates the correction values for each of the liquid crystal panels 141R, 141G, and 141B based on the correction values N (n) stored in the correction value storage unit 46. The γ characteristics are grasped and converted into γ correction data (process S12). Specifically, when the γ characteristics of the liquid crystal panels 141R, 141G, and 141B are grasped as a graph G1 shown in FIG. 9, the γ is changed by changing the drive voltage V at each gradation value T so as to become a graph G2. Obtain correction data. The γ correction data is configured as an LUT in which the drive voltage at each gradation value is associated.
[0039]
(3-10) When the γ correction data is generated by the correction data generation unit 43, the correction data writing unit 44 writes the generated γ correction data into the memory 176 of the projector 100 as the LUT 177 (Step S13).
(3-11) When the writing of the LUT 177 to the memory 176 of the projector 100 is completed, the image signal input unit 41 again inputs an image signal including a plurality of gradation signals to the projector 100, and outputs the gradation images 100A to 100F. Is projected on the projection surface 2 (process S14). The image processing means 42 captures the image projected through the two-dimensional image sensor 3 and the signal processing means 31 to obtain a gradation value, confirms the projected image after writing the γ correction data, and confirms that there is no problem. If there is a problem, the process of steps S6 to S13 is performed again, and γ correction data is generated and written to the projector 100 again (process S15).
[0040]
(4) Effects of the embodiment
According to the above-described embodiment, the following effects can be obtained.
(4-1) The two-dimensional image sensor 3 and the signal processing unit 31 serving as image capturing units convert the plurality of reference grayscale images 21A to 21F and the plurality of grayscale images 100A to 100F projected by the projector 100, respectively. Since the reference gradation images 21A to 21F and the projected gradation images 100A to 100F in a corresponding relationship can be simultaneously processed into the measurement control device 4, image processing is performed by the image processing means 42 to grasp the γ characteristic. can do. Therefore, it is not necessary to switch the gradation image and to perform measurement by the point sensor for each gradation image, and it is possible to grasp the γ characteristic of the projector 100 at high speed.
[0041]
(4-2) Since a plurality of projected gradation images 100A to 100F are simultaneously captured by the two-dimensional image sensor 3 and the signal processing unit 31, the plurality of gradation images 100A to 100F are not affected by light emission variation of the light source and the like. By comparing the toned images 100A to 100F with the plurality of reference gradation images 21A to 21F, the γ characteristics can be grasped with high accuracy. Since the γ characteristic can be grasped at high speed and with high accuracy in this way, the correction data generating means 43 can generate high-precision correction data in a short time.
[0042]
(4-3) As shown in FIG. 9, since the γ characteristic G1 of the projector 100 is grasped and the γ correction data for correcting the drive voltage signal V is generated, the projected gradation images 100A to 100F are generated. The tone image can be approximated to the reference tone images 21A to 21F, and an individual tone difference between the liquid crystal panels 141R, 141G, and 141B constituting the electro-optical device 140 is eliminated, and an appropriate tone image according to the input tone signal is displayed. Can be done.
(4-4) Since the correction data writing unit 44 is provided, the generated γ correction data can be automatically written into the memory 176 of the projector 100, so that the image adjustment of the projector 100 can be performed at higher speed. Can be.
[0043]
(4-5) By performing image capture using the two-dimensional image sensor 3, a plurality of gradation images 100A to 100F and a plurality of reference gradation images 21A to 21F can be simultaneously captured. Then, the captured image is converted into a digital signal suitable for a computer by the signal processing unit 31, so that digital image processing is performed by the image processing unit 42, and the generation of correction data can be simplified.
(4-6) By configuring the reference gradation image as the gray scale 21 printed on the projection surface 2, the gray scale 21 is always displayed on the projection surface 2. The comparison with the plurality of gradation images 100 </ b> A to 100 </ b> F can be easily performed, and the structure of the device is not complicated.
[0044]
(4-7) When performing the image adjustment of the projector 100, by executing a series of steps of the processing S <b> 6 to the processing S <b> 10 and the processing S <b> 12, acquisition of different gradation values can be simultaneously performed using the two-dimensional imaging element 3. Since the γ characteristic G1 can be obtained and acquired, the γ correction data can be calculated at high speed and with high accuracy.
(4-8) Since the writing of the γ correction data is performed in the processing S13, a series of procedures relating to the image adjustment of the projector 100 can be automatically performed, and the efficiency of the image adjustment can be improved.
[0045]
(5) Modification of the embodiment
The present invention is not limited to the above-described embodiment, but includes the following modifications.
In the above-described embodiment, the reference gradation image is generated by directly printing the gray scale 21 on the projection surface 2, but the present invention is not limited to this. That is, a projector in which γ correction data is recorded in advance may be separately prepared, and an image signal including the same gradation signal as that of the projector to be adjusted may be input to display the reference gradation image on the projection surface. Further, as the reference gradation image generation means, LEDs having stable light emission luminance may be provided on the projection surface at different densities according to the gradation, and may be used as a plurality of reference gradation images.
[0046]
In the above-described embodiment, the image adjustment device 1 is used to obtain the γ correction data of the three-panel projector 100. However, the present invention is not limited to this, and may be used for a single-panel projector to perform light modulation. The electro-optical device is not limited to the liquid crystal panels 141R, 141G, and 141B, and the image adjustment device of the present invention may be used when obtaining gamma correction data of an electro-optical device using a micromirror.
[0047]
In the above-described embodiment, the image adjustment method of the present invention is used for image adjustment of the projection type projector 100. However, the present invention is not limited to this, and γ correction data of a direct-view type liquid crystal display, a plasma display, etc. At the time of calculation, the image adjustment method of the present invention may be adopted.
In addition, specific structures, procedures, shapes, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.
[0048]
【The invention's effect】
According to the present invention as described above, a plurality of reference gradation images and a plurality of gradation images projected by the projector can be simultaneously captured by the image capturing means. Since the γ characteristic can be grasped by performing image processing on the gradation image thus obtained by the image processing means, the γ characteristic can be grasped at high speed and with high accuracy, and the correction data can be generated in a short time.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a structure of a projector to be adjusted according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a signal processing system of a projector to be adjusted in the embodiment.
FIG. 3 is a schematic diagram illustrating a structure of an image adjustment device according to the embodiment.
FIG. 4 is a diagram illustrating a reference scale included in the image adjustment device according to the embodiment.
FIG. 5 is a block diagram illustrating a structure of a measurement control device included in the image adjustment device according to the embodiment.
FIG. 6 is a flowchart illustrating a procedure of an image adjusting method by the image adjusting apparatus according to the embodiment.
FIG. 7 is a display state on a screen when the reference scale is illuminated in the embodiment.
FIG.
FIG. 8 is a diagram showing a display state on a screen in which a plurality of projected gradation images are displayed above a reference scale in the embodiment.
FIG. 9 is a graph showing γ characteristics obtained from a projection gradation image to be adjusted in the embodiment.
[Explanation of symbols]
1 Image adjustment device
2 Projection surface
3 Two-dimensional image sensor
21 Gray scale (reference scale)
31 signal processing means (signal conversion unit)
41 Image signal input means
42 Image processing means
43 Correction Data Generation Means
44 Correction data writing means
100 projector
140 Electro-optical device
160 Projection optical system
176 memory (correction data storage unit)

Claims (6)

Adjusts a projection image of a projector including a light source, an electro-optical device that modulates a light beam emitted from the light source according to image information, and a projection optical system that enlarges and projects the modulated light beam modulated by the electro-optical device. An image adjustment device for a projector,
A projection surface for projecting a projection image of the projector,
Reference gradation image generating means for generating a plurality of reference gradation images serving as adjustment references on the projection surface;
Image signal input means for inputting an image signal including a gradation signal corresponding to the plurality of reference gradation images and causing the projector to be adjusted to simultaneously display the plurality of gradation images;
Image capturing means for simultaneously capturing the plurality of reference tone images and the plurality of tone images projected by the projector as image data,
Image processing means for performing image processing based on the image data captured by the image capturing means;
An image adjustment device for a projector, comprising: a correction data generation unit that generates correction data for image display of the projector based on a result of the image processing by the image processing unit. The image adjustment device for a projector according to claim 1,
The correction data generating unit is configured to convert an input signal input to the electro-optical device based on a difference between each gradation image projected by a gradation signal corresponding to each reference gradation image and the reference gradation image. An image adjustment device for a projector, wherein the adjustment is performed. The image adjustment device for a projector according to claim 1 or 2,
The projector includes a correction data storage unit that records and stores the correction data generated by the correction data generation unit,
An image adjustment apparatus for a projector, comprising: a correction data writing unit that writes correction data generated by the correction data generation unit into the correction data storage unit. An image adjustment device for a projector according to any one of claims 1 to 3,
The image capturing unit includes a two-dimensional image sensor capable of imaging a predetermined area of the projection surface, and a signal conversion unit that converts an image signal captured by the two-dimensional image sensor into a signal compatible with a computer. An image adjustment device for a projector, comprising: An image adjustment device for a projector according to any one of claims 1 to 4,
The image adjustment device for a projector, wherein the reference gradation image generation unit includes a reference scale composed of a plurality of reference gradation images formed on the projection surface by printing or the like. An image adjustment method of an image display device that adjusts a display image of an image display device including an electro-optical device that forms an optical image based on an input image signal,
Inputting an image signal including a gradation signal corresponding to a plurality of reference gradation images as an adjustment reference to an image display device to be adjusted, and causing the image display device to simultaneously display the plurality of gradation images;
Simultaneously capturing the plurality of reference gradation images and the displayed plurality of gradation images as image data;
Performing image processing based on the captured image data;
Generating correction data for image display of the image display device based on a result of the image processing.

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