JP2006065076A - Imaging device, control method for imaging device, control program, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device capable of accurately determining the light source color of field light by comparing a visible-light photometric value and an infrared light photometric value which are detected respectively. <P>SOLUTION: A luminance detecting means of detecting the luminance of the photographic field light which is incident through a photographic lens 105 comprises a dichroic mirror 132 which separates an infrared-light component and a visible-light component of the field light, a visible-light photometric sensor 130 which measures the visible-light component separated by the dichroic mirror 132, and an infrared-light photometric sensor 131 which measures the infrared-light component separated by the dichroic mirror 132, and the visible-light photometric value of the visible-light photometric sensor 130 is compared with the infrared-light photometric value of the infrared-light photometric sensor 131 to correct the focus adjustment position of the photographic lens 105. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus having a luminance detecting means for detecting the luminance of the photographing field and a focus adjusting means for automatically adjusting the focus of the photographing lens with respect to the photographing subject, a control method for controlling the imaging apparatus, The present invention relates to a control program for realizing the control method and a storage medium storing the control program.

Conventionally, a focus of a measurement object is detected from a positional relationship between a pair of images formed on a pair of light receiving element arrays, a photographing lens is driven according to the detection result, and focus adjustment of a photographing object scene image is performed. 2. Description of the Related Art A phase difference AF (autofocus) type automatic focus adjustment device is known (see, for example, Patent Documents 1 and 2).
Japanese Examined Patent Publication No. 1-45883 JP 2000-292682 A

  In the conventional phase difference AF type focus adjustment device described above, the aberration of the optical system constituting the focus adjustment device depends on the wavelength of light emitted from a light source that illuminates the subject, for example, a fluorescent lamp or an incandescent lamp. In addition, the position of the image formed on the light receiving element is different. Therefore, depending on the light source for shooting subject illumination, there is a problem that the shooting subject is out of focus.

  In order to solve this problem, Japanese Patent Publication No. 1-45883, which is Japanese Patent Application Laid-Open No. HEI 1-45983, detects a ratio of visible light and infrared light of a subject light beam incident on a photographing lens by a focus detection sensor, and photographs according to the ratio. A technique for correcting the in-focus position of the lens is disclosed.

  In Japanese Patent Laid-Open No. 2000-292682, which is Patent Document 2, the first and second photometric means having main sensitivities in the visible light region and the infrared light region of the subject luminous flux are light receiving means for focus detection, respectively. Are provided separately, and the in-focus position of the photographic lens is corrected by the correcting means in accordance with the respective photometric values of the first and second photometric means.

  In Patent Document 2, as a layout of a camera (imaging device), a remote control sensor that receives a remote control (remote control) signal for performing remote operation of the camera is used to reduce the number of parts. The second photometric means for detecting light is used.

  However, while the first photometric means accurately measures the visible light region in the photographing field, the remote control sensor as the second photometric means has a wide range of area including the photographing field. Infrared light is metered, and it is difficult to determine the amount of infrared light component with respect to the light component of a partial region of the photographic field in which focus detection should actually be performed. That is, it is necessary to perform photometry by separating the visible light wavelength and the infrared light wavelength with respect to the same region of the shooting field.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to compare the visible light metering output value and the infrared light metering output value, and An imaging device capable of accurately determining a light source color, a control method for the imaging device, a control program, and a storage medium are provided.

  In order to achieve the above object, an imaging apparatus according to the present invention includes a focus adjusting unit that adjusts a focus of a photographic lens with respect to a predetermined region of the photographic field, and luminance of the photographic field light incident through the photographic lens. A luminance detecting means for detecting the light, wherein the luminance detecting means is separated by a light separating means for separating an infrared light component and a visible light component of the object scene light, and the light component separating means. A visible light metering means for metering the visible light component, and an infrared light metering means for metering the infrared light component separated by the light component separating means, and a visible light metering value of the visible light metering means; The focus adjustment position of the photographing lens is corrected by comparing the infrared light metering value of the infrared light metering means.

  In order to achieve the above object, an imaging apparatus control method according to the present invention includes a focus adjustment step for adjusting a focus of a photographic lens with respect to a predetermined region of a photographic field, and a photographic subject incident through the photographic lens. A method of controlling an imaging device including a luminance detection step of detecting a luminance of field light, wherein the luminance detection step includes a light separation step of separating an infrared light component and a visible light component of the object field light; The visible light metering step, which comprises a visible light metering step for metering the visible light component separated by the light component separation step, and an infrared light metering step for metering the infrared light component separated by the light component separation step. The focus adjustment position of the photographing lens is corrected by comparing the visible light photometric value of the process with the infrared light photometric value of the infrared light photometric process.

  By comparing the visible light metering value and the infrared light metering value, it is possible to accurately determine the light source color of the object scene light.

  Embodiments of an imaging apparatus, an imaging apparatus control method, a control program, and a storage medium according to the present invention will be described below with reference to the drawings.

(First embodiment)
First, a first embodiment will be described with reference to FIGS.

  In FIG. 1 to FIG. 7, the same reference numerals are assigned to the same components.

  FIG. 1 is a side view showing a schematic internal configuration of a digital camera that is an imaging apparatus according to the first embodiment.

  In FIG. 1, reference numeral 101 denotes a CPU (Central Processing Unit), and the operation of the digital camera is controlled by the CPU 101. Reference numeral 105 denotes a photographic lens that forms an image of photographic field light on the CCD 106 that is an image sensor. Reference numeral 102 denotes a shutter (focus plane shutter) that controls the amount of photographic field light that reaches the CCD 106 from the photographic lens 105. A part of the photographic field light is a known phase difference type focus detection unit comprising a field lens 123, a secondary imaging lens 124, and a CCD line sensor 119 for focus detection by a semi-transparent main mirror 121 and a sub mirror 122. Thus, it can be detected as a so-called defocus amount indicating how much and in what direction the focus of the object scene light imaged by the photographing lens 105 is deviated from the light receiving surface of the CCD 106. A known phase difference type focus detection unit comprising a field lens 123, a secondary imaging lens 124 and a CCD line sensor 119 actually has three photometric areas 118a, 118b and 118c on the finder screen as shown in FIG. It is possible to detect the focus.

  In consideration of the lens drive sensitivity of the photographic lens 105 (fineness of lens-specific control) with respect to the defocus amount detected by the phase difference focus detection unit, the CPU 101 controls the photographic lens drive control unit of FIG. A driving amount pulse for driving the photographing lens 105 is sent to 125, and the photographing lens drive control unit 125 drives a pulse motor (not shown) in accordance with the sent driving amount pulse to bring the photographing lens 105 into the in-focus position. By driving, automatic focus adjustment is performed (focus detection means).

  Reference numeral 128 denotes a focusing plate, which is placed on an imaging plane equivalent to the imaging plane of the CCD 106 of the photographing lens 105, and the object scene image formed on the focusing plate 128 is viewed through the pentaprism 127 and the eyepiece 126. This is a TTL type optical finder configuration.

  Reference numeral 130 denotes a visible light photometric sensor (visible light photometric means) that measures the luminance of the visible light in the photographic field. The imaging lens 129 converts the object field image of the focusing screen 128 into the visibility filter 133. The image is formed on the visible light photometric sensor 130. The visible light photometric sensor 130 has light receiving areas divided into 3 × 5 in the vertical and horizontal directions, and as shown in FIG. 3, the main area of the finder field (field area) of the digital camera is divided into 3 areas. It is possible to divide into x5 areas and perform photometry at wavelengths that match the human visibility.

  However, the 3 × 5 dividing line in FIG. 3 is schematically written, and the operator cannot actually see the dividing line.

  The infrared light component of the object field light of the focusing plate 128 collected through the imaging lens 129 is reflected by the dichroic mirror 132 which is a wavelength selective element (light separating means), and the infrared light is reflected. The wavelength components excluding the components are transmitted and imaged on the visible light photometric sensor 130 as described above.

  On the other hand, the infrared light component of the object scene light reflected by the dichroic mirror 132 is imaged on the infrared light photometric sensor (infrared light photometric means) 131, so that the luminance can be measured.

  Since the infrared light metering sensor 131 uses the same sensor as the visible light metering sensor 130, the infrared light metering sensor 131 has a light receiving area divided in length × width and 3 × 5, respectively. Since the field light is imaged by 129, the visible light photometric sensor 130 and the infrared light photometric sensor 131 each have 3 × 5 pieces of visible light luminance information and red for the same field area. External light luminance information can be obtained.

  FIG. 5A is a diagram showing an example of the spectral reflectance of the dichroic coating deposited on the surface of the dichroic mirror 132, the spectral transmittance of the visibility filter 133, and the spectral sensitivity of the photometric sensors 130 and 131. b) is a diagram showing the relationship between the type of light source (incandescent light bulb, fluorescent lamp, natural light) and spectral sensitivity, where the vertical axis indicates relative sensitivity and the horizontal axis indicates wavelength.

  As shown in FIG. 5A, since the infrared light photometric sensor 131 does not pass through the visibility filter 133, photoelectric conversion is possible up to light in the infrared light long wavelength region. The spectral reflectance characteristics of the dichroic coating reflect light having a wavelength longer than about 700 nm, for example, so that it is possible to measure light of only an infrared light component.

  On the other hand, the field light transmitted through the dichroic mirror 132 becomes light having a wavelength shorter than about 700 nm, for example, and is incident on the visible light photometric sensor 130 according to the spectral transmittance characteristics of the visibility filter 133. The photometric sensor 130 can measure the field luminance according to the visibility.

  FIG. 4A is a diagram illustrating an example of the layout of the visible light photometric sensor 130 and the infrared light photometric sensor 131 in FIG. 1, but the spectral characteristics of the visible light incident on the visible light photometric sensor 130 described above are strict. It is also possible to omit the visibility filter 133 by changing the film characteristics of the dichroic coating 132a to bring the transmittance in the visible region close to the visibility.

  On the other hand, FIG. 4B is a diagram showing an example of a layout in which the dichroic mirror 132 in FIG. 4A is replaced with a visibility filter 133a. Since the dichroic coating 132a shown in FIG. 4A is deposited on the surface of the visibility filter 133a, the spectral characteristics of the light incident on the visible light photometric sensor 130 and the infrared photometric sensor 131 are shown in FIG. This is equivalent to that obtained with the layout of a). That is, if the layout as shown in FIG. 4B is used, the cost of the base glass of the dichroic mirror 132 can be reduced, and the visibility filter 133 disposed on the front surface of the visible light photometric sensor 130 can be omitted. There is an advantage that the degree of freedom increases.

  FIG. 4C is a diagram illustrating an example of a layout in the case where the visible light photometric sensor 130 and the infrared light photometric sensor 131 are not the same from the viewpoint of space or cost. In this case, the sensor chip of the infrared photometric sensor 131a is smaller than the chip of the visible light photometric sensor 130, and both the photometric sensors 130 and 131a measure the same field of view of the digital camera. The configuration in which the imaging lens 134 is disposed on the front surface is adopted.

  Next, referring back to FIG. 1 again, when the operator presses a release button (not shown), the main mirror 121 is retracted out of the optical path of the photographic lens 105 and the object field condensed by the photographic lens 105. The amount of light is controlled by the shutter 102, subjected to photoelectric conversion processing as a field image by the CCD 106, and then displayed on the external display unit 113 as a captured image. The external display unit 113 includes a TFT color liquid crystal display.

  FIG. 2 is a block diagram showing a schematic configuration of the digital camera according to the first embodiment.

  In FIG. 2, reference numeral 101 denotes a CPU. The CPU 101 includes a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a data storage means 104, an image processing unit 108, and an LCD control unit. 111, a release switch (SW) 114, and a DC / DC converter 117 for supplying power are connected to the image processing unit 108, and a CCD control unit 107 and a CCD 106 are connected to the image processing unit 108, respectively. The CCD 106 has, for example, about 5 million pixels (2560 × 1920) as the number of effective pixels.

  A display driving unit 112 and a display unit 113 are connected to the LCD control unit 111. The display unit 113 is composed of a TFT color liquid crystal display capable of displaying an image of 320 × 240 by thinning the image captured by the CCD 106 into 1/8 length and width respectively (display means). Power is supplied from the battery 116 to the DC / DC converter 117.

  The CPU 101 performs various controls based on a control program stored in the ROM 102. Among these controls, the captured image signal output from the image processing unit 108 is read, DMA transfer to the RAM 103, DMA transfer of data from the RAM 103 to the LCD control unit 111, JPEG compression of the image data. Then, processing for storing in the data storage means 104 in a file format is performed. Further, the CPU 101 instructs the CCD 106, the CCD control unit 107, the image processing unit 108, the LCD control unit 111, and the like to change the number of data fetching pixels and digital image processing.

  Reference numeral 119 denotes a pair of line CCD sensors for focus detection. The focus detection control unit 120 performs A / D conversion processing on the voltage obtained from these line CCD sensors 119 and sends the voltage to the CPU 101. The focus detection control unit 120 also controls the accumulation time and AGC (auto gain control) of the line CCD sensor 119 under the instruction of the CPU 101.

  The CPU 101 processes the signal sent from the focus detection control unit 120 to calculate a lens driving amount for the main subject to be brought into focus from the current focus detection state for the main subject, and the photographing lens driving unit 125. The photographic lens driving unit 125 can focus on the main subject by moving the focus adjustment lens in the photographic lens 105 based on the instruction from the CPU 101.

  Further, processing for outputting a control signal for controlling the supply of power to each element to the DC / DC converter 117, and the like, based on the control of the CPU 101, are instructed to perform a photographing operation associated with the operation of the release SW 114. Done.

  The RAM 103 includes an image development area 103a, a work area 103b, a VRAM 103c, and a temporary save area 103d. The image development area 103a is used as a temporary buffer for temporarily storing the captured image (YUV digital signal) sent from the image processing unit 108 and the JPEG compressed image data read from the data storage unit 104. Used as an image-dedicated work area for image compression processing and decompression processing. The work area 103b is an area for various programs. The VRAM 103 c is used as an area for storing display data to be displayed on the display unit 113. The temporary save area 103d is an area for temporarily saving various data.

  The data storage means 104 is for storing captured image data JPEG-compressed by the CPU 101 or various attached data referred to by an application in a file format, and includes a flash memory.

  The taking lens 105 is composed of a plurality of lenses for optically projecting the object scene image onto the CCD 106. The CCD 106 is for converting a photographed image projected by the photographing lens 105 into an analog electric signal. The CCD control unit 107 is a timing generator for supplying a transfer clock signal and a shutter signal to the CCD 106, a circuit for performing noise removal and gain processing of the CCD output signal, and an A for converting an analog signal into a 10-bit digital signal. / D conversion circuit and the like are included.

  The image processing unit 108 performs image processing such as gamma conversion processing, color space conversion processing, white balance processing, AE processing, and flash correction processing on the 10-bit digital signal output from the CCD control unit 107, and performs YUV (4: 2). : 2) An 8-bit digital signal in a format is output. The imaging lens 105, the CCD 106, the CCD control unit 107, and the image processing unit 108 constitute an imaging unit.

  The LCD control unit 111 receives the YUV digital image data transferred from the image processing unit 108 or the JUV decompressed YUV digital image data from the image file in the data storage unit 104, and converts it into an RGB digital signal. After that, a process of outputting to the display driving unit 112 is performed. The display driving unit 112 performs control for driving the display unit 113. The LCD control unit 111, the display driving unit 112, and the display unit 113 constitute display means.

  The release SW 114 is a switch for instructing the start of the shooting operation. The release SW 114 has a two-step switch position depending on the pressing pressure of a release button (not shown), and locks camera settings such as white balance and AE upon detection of the first-stage position (the first switch SW1 is on). The operation is performed, and the capturing operation of the object scene image signal is performed by detecting the second stage position (the second switch SW2 is turned on).

  Further, in order to determine and obtain the focus correction amount (correction of the focus adjustment position) in the focus adjustment device of the digital camera according to the present embodiment from the object field light source color, the CPU 101 determines the visible light photometric sensor 130 and the infrared light. Photometric control is performed on the photometric sensor 131. After the photometric luminance signals obtained by these photometric sensors 130 and 131 are captured by the CPU 101 and subjected to AD conversion processing, the CPU 101 performs object scene light source determination as will be described later, and the focus correction amount obtained thereby. Is added to the defocus amount, which is the focus detection deviation amount, and a lens driving amount is calculated, and a signal indicating the calculation result is sent to the lens driving unit 125, and a photographing lens (actually a part of the focal points constituting the lens) is sent. By driving the adjusting lens 105, the subject is brought into focus.

  The field light source determination process will be described later.

  The battery 116 is a rechargeable secondary battery or a dry battery. Further, the DC / DC converter 117 receives a power supply from the battery 116, generates a plurality of power supplies by performing boosting and regulation, and supplies a power supply of a necessary voltage to each component including the CPU 101. . The DC / DC converter 117 can control the supply start and supply stop of each voltage according to a control signal from the CPU 101.

  Next, the operation of the digital camera according to the present embodiment will be described with reference to FIG.

  FIG. 6 is a flowchart showing an operation flow of the digital camera according to the present embodiment.

  In FIG. 6, first, when a power switch (not shown) is turned on from a non-operating state of the digital camera, the power of the digital camera is turned on (step S600), and the release button is pushed into the digital camera. The CPU 101 determines whether or not the release SW 114 has reached the first position, that is, whether or not the first switch SW1 of the release SW 114 has been turned on (ON) (step S601). ).

  When the CPU 101 determines that the release button is pressed and the release SW 114 is in the first position (the first switch SW1 is on), a selection mode (focus detection area selection) for selecting the focus detection area of the photographing lens 105 is selected. The CPU 101 determines whether the (mode) is set to the automatic mode or the manual mode, that is, whether the distance measuring point is arbitrary (step S602).

  If the CPU 101 determines that the focus detection area selection mode of the photographing lens 105 is set to the manual mode (turns on a focus detection area selection switch (not shown)), that is, the distance measuring point is arbitrary, the photographing is performed. An operator can manually select one of the focus detection areas 118a, 118b, and 118c shown in FIG. 3 by operating a switch dial (not shown).

  On the other hand, when the focus detection area selection mode of the photographing lens 105 is set to the automatic mode, that is, when the CPU 101 determines that the distance measuring point is not arbitrary, the three focus detection areas 118a, 118b, and 118c in FIG. On the basis of the defocus amounts DEF0 to DEF2, the focus detection area automatic selection subroutine automatically selects one of the three focus detection areas. Several methods are conceivable as an algorithm for automatically selecting the focus detection area, but in a multi-point AF (autofocus) digital camera, a known near-point priority algorithm in which a weight is given to the central focus detection area is effective. (Step S603).

  As described above, even if the focus detection area selection mode of the photographic lens 105 is set to the manual mode or the automatic mode, as a result, one focus detection area is determined by the CPU 101 (step S604).

  Next, after obtaining the luminance information obtained by dividing the photographing field into 3 × 5 from the visible light photometric sensor 130, the exposure value of the digital camera is calculated by the CPU 101 according to a predetermined photometric algorithm calculation based on the luminance information. Calculated. On the other hand, infrared light metering is performed simultaneously with visible light metering by the infrared metering sensor 131, and the optimum exposure value of the digital camera in the infrared light is calculated by the CPU 101 (step S605).

  Further, the photometry operation here (step S605) is continuously performed until a photographing operation (actually a main mirror up operation) described later is performed.

  The algorithm for calculating the optimum exposure value from the luminance information of 3 × 5 obtained by the visible light metering by the visible light metering sensor 130 and the infrared metering by the infrared metering sensor 131 may be a simple addition average, The calculation may be performed by maximally weighting the photometric area corresponding to the focus detection area determined in step S604.

  Next, assuming that the optimum exposure value of the digital camera by visible light photometry obtained in step S605 is BVa and the optimum exposure value of the digital camera by infrared light metering is BVb, the CPU 101 determines the difference between BVa and BVb: δd = BVa−BVb is calculated, and the CPU 101 determines the type of light source of the shooting field according to this δ value (step S606), and the focus position correction amount corresponding to the type of the light source is determined by a focus detection calculation described later. By correcting the obtained focus detection deviation amount (defocus amount) by the CPU 101 (step S607), it is possible to perform optimum focus adjustment under various light sources.

  Specifically, the focal position correction amount is determined based on the field light source determination table shown in FIG. That is, after calculating δd, which is the difference between the visible light metering exposure value and the infrared metering exposure value, if the δd value is greater than the threshold value A, it is determined that the infrared light component is very large. The field light source is determined to be an incandescent lamp. The focus position correction amount of the focus detection deviation amount at that time is zero.

  This is because when the digital camera is shipped from the factory, the focus adjustment function is adjusted using a chart under incandescent lamp illumination. When shooting with an actual digital camera under an incandescent light source, the focus detection function error will occur. Therefore, correction of the focus detection deviation amount is unnecessary.

  Next, when the δd value is between the threshold value A and the threshold value B (A> B), it is determined that the light source is sunlight, that is, illumination under natural light, and the focal position correction amount α is determined. . Furthermore, when the δd value is smaller than the threshold value B, it is determined that the illumination is under the light source of the fluorescent lamp with almost no infrared light, and the focal position correction amount β is determined.

  The thresholds A and B are constants for correctly determining the type of illumination light source in the shooting field, and are stored in an EEPROM (nonvolatile programmable memory) mounted on the CPU 101 of the digital camera. .

  Subsequently, the focus detection line CCD sensor 119 performs the focus detection operation again on the focus detection region determined in step S604 (step S608). When the focus is detected, as is well known, a defocus amount and direction information are obtained as output, but the focus position correction amount corresponding to the type of light source obtained in step S607 is added to the defocus amount. Then, from the defocus amount obtained in this way and the lens driving sensitivity of the photographic lens 105 attached to the digital camera, the extension amount of the photographic lens 105 to be finally determined is determined.

  Next, the CPU 101 sends a signal to the photographing lens drive control unit 125 to drive the photographing lens 105 by a predetermined amount in accordance with the signal from the line CCD sensor 119 for focus detection in a state before driving the lens (step S609).

  With the above operation, it is possible to perform accurate automatic focus adjustment independent of the type of light source in the shooting field.

  Next, the CPU 101 determines whether or not the first switch SW1 is kept on by looking at the viewfinder field in a state where the photographer is displayed in focus (step S610). If the CPU 101 determines that the first switch SW1 is kept on, the CPU 101 further determines whether or not the second switch SW2 is turned on by further pressing the release button (step S611). When the CPU 101 determines that the second switch SW2 has been turned on by pressing the release button, the CPU 101 transmits signals to a shutter control unit, a diaphragm drive unit, and a CCD control unit 107 (not shown) to perform well-known shooting. An operation is performed (step S612).

  On the other hand, if the CPU 101 determines in step S610 that the first switch SW1 is off (OFF), the process returns to step S601 to enter a standby state until the first switch SW1 is turned on. If the CPU 101 determines in step S611 that the second switch SW2 is not turned on, the process returns to step S610, and waits until the second switch SW2 is turned on.

  In the photographing operation in step S612, first, the motor is energized via a motor control unit (not shown) to raise the main mirror 121, and a diaphragm (not shown) of the photographing lens 105 is narrowed, and then a magnet MG (not shown) of the shutter 102 is shown. −1 is energized and the front curtain of the shutter 102 is opened, so that the accumulation of object scene light in the CCD 106 is started. After a predetermined shutter time has elapsed, the magnet MG-2 is energized, and the rear curtain of the shutter 102 is closed, whereby the accumulation of the field light in the CCD 106 is completed. Next, the motor is energized again, the main mirror 121 is lowered, the shutter 102 is charged, and a series of shutter release sequence operations (photographing operations) is completed.

  On the other hand, by the photographing operation in step S612, the object scene image exposed to the CCD 106 is subjected to photoelectric conversion processing and converted into digital data of about 5 million pixels (2560 × 1920) by the image processing unit 108. Thereafter, the digital data is temporarily stored in the image development area 103 a of the RAM 103. Next, the digital data of the entire image of 2560 × 1920 pixels stored in the image development area 103a of the RAM 103 is the entire 320 × 240 pixels thinned out to 1/8 in the vertical and horizontal directions for display on the display unit 113. After being converted to image data, it is stored again in the display VRAM 103c of the RAM 103, and the entire image data of 320 × 240 pixels is displayed on the display unit 113 (step S613), and the data displayed on the display unit 113 is viewed. Thus, the operator can confirm the entire image of the photographed image.

  On the other hand, the entire image digital data of 2560 × 1920 pixels stored in the image development area 103a of the RAM 103 is JPEG compressed and then recorded as image data in the data storage means 104 (step S614).

  Next, the digital camera is in a standby state until an input is again made by an operation member by the operator, and during that time, the entire image data is continuously displayed on the display unit 113. Then, when an input is made by the operator, the entire image data display on the display unit 113 is turned off, and a transition is made to a state corresponding to the operator's input (step S615), and then the process returns to step S601.

  As described above in detail, according to the present embodiment, the photometric means for detecting the luminance of the photographic field light has the object separated by the wavelength selective element that separates the infrared light component and the visible light component. The visible light photometric sensor 130 for measuring the visible region of the field light and the infrared light photometric sensor 131 for measuring the infrared region of the subject field light are configured. Since photometry is performed in the same range within the field, the light source color of the object field light is obtained by comparing the visible light photometric value and the infrared photometric value detected by each photometric sensor 130, 131. Can be determined accurately.

  In addition, since the object scene image is formed on the light receiving sensor of the visible light photometric sensor 130 and the light receiving sensor of the infrared light photometric sensor 131 using the same imaging lens, the apparatus itself is saved. It becomes a space and contributes to the miniaturization of digital cameras.

(Other embodiments)
The above is the description of the embodiments of the present invention. However, the present invention is not limited to these embodiments, and the functions shown in the claims or the functions of the embodiments can be achieved. Any configuration is applicable.

  Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus. Needless to say, this can also be achieved by reading and executing the program code stored in the storage medium. In this case, the program code itself read from the storage medium realizes the novel function of the present invention, and the storage medium and program storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like is used. it can.

  Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also an OS (operating system) or the like running on the computer based on the instruction of the program code. However, it is needless to say that a case where the function of the above-described embodiment is realized by performing part or all of the actual processing and the processing is included.

  Further, after the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, the function expansion is performed based on the instruction of the program code. It goes without saying that the CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

1 is a side view showing a schematic internal configuration of a digital camera that is an imaging apparatus according to a first embodiment. It is a block diagram which shows schematic structure of the digital camera which is an imaging device which concerns on 1st Embodiment. It is a figure which shows the example of a display of the finder of the digital camera which is an imaging device which concerns on 1st Embodiment. It is a figure which shows an example of the layout of the visible light photometric sensor and infrared light photometric sensor in the digital camera which is an imaging device which concerns on 1st Embodiment. FIG. 3 is a spectral characteristic diagram of a visible light photometric sensor, an infrared light photometric sensor, an optical component, and various light sources in the digital camera that is the imaging apparatus according to the first embodiment. It is a flowchart which shows the flow of imaging | photography operation | movement of the digital camera which is an imaging device which concerns on 1st Embodiment. It is a figure which shows an example of the field light source determination table | surface in the digital camera which is an imaging device which concerns on 1st Embodiment.

Explanation of symbols

101 CPU (central processing unit)
105 Photography lens 106 CCD (photoelectric conversion element)
113 External display unit 118a Focus detection area 118b Focus detection area 118c Focus detection area 119 Focus detection CCD (photoelectric conversion element)
121 Main mirror 129 Imaging lens 130 Visible light photometric sensor (visible light photometric means)
131 Infrared photometric sensor (infrared photometric means)
132 Dichroic mirror (light separation means)
133 Visibility filter (light separation means)

Claims (10)

An imaging apparatus comprising: a focus adjusting unit that adjusts the focus of a photographic lens with respect to a predetermined region of a photographic field; and a luminance detecting unit that detects a luminance of photographic field light incident through the photographic lens. ,
The luminance detecting means includes
Light separation means for separating the infrared light component and visible light component of the object scene light, visible light photometry means for measuring the visible light component separated by the light component separation means, and separation by the light component separation means Comprising an infrared light metering means for metering the infrared light component,
An imaging apparatus for correcting a focus adjustment position of the photographing lens by comparing a visible light metering value of the visible light metering unit and an infrared light metering value of the infrared light metering unit.   The light component separating means is disposed with a predetermined angle behind an imaging lens for forming an image of the object field light disposed on the optical axis having a predetermined angle with respect to the finder optical axis of the camera. The imaging apparatus according to claim 1, wherein the visible photometric unit and the infrared photometric unit are in an imaging relationship with respect to the imaging lens.   The imaging apparatus according to claim 1 or 2, wherein the visible light metering means comprises a visible light metering sensor, and the infrared light metering means comprises an infrared light metering sensor.   The imaging apparatus according to claim 1, wherein the light component separating unit includes a wavelength selective element.   The imaging apparatus according to claim 4, wherein the wavelength selective element is a dichroic mirror that reflects infrared light and transmits visible light.   The imaging apparatus according to claim 4, wherein the wavelength selective element is a dichroic mirror that transmits infrared light and reflects visible light.   5. The imaging apparatus according to claim 4, wherein the wavelength selective element is a dichroic mirror in which a material that reflects an infrared light component is deposited on a filter surface that absorbs the infrared light component. A method for controlling an imaging apparatus, comprising: a focus adjustment step for adjusting a focus of a shooting lens with respect to a predetermined region of the shooting field; and a luminance detection step for detecting the luminance of shooting field light incident through the shooting lens Because
The luminance detection step includes a light separation step for separating an infrared light component and a visible light component of object light, a visible light photometry step for measuring a visible light component separated by the light component separation step, It consists of an infrared light metering step for metering the infrared light component separated by the light component separation step,
Control of the imaging apparatus, wherein the focus adjustment position of the photographing lens is corrected by comparing the visible light metering value of the visible light metering step and the infrared light metering value of the infrared light metering step. Method.   A control program comprising computer-readable program code for realizing the control method of the imaging apparatus according to claim 8.   A storage medium storing the control program according to claim 9.

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