JP2007135032A - Imaging apparatus and image reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce an image with a characteristic being substantially the same as that in imaging when the picked-up image is reproduced and displayed on an external monitor or reproduced and printed by a printer. <P>SOLUTION: A digital camera having a built-in monitor extracts the image on the screen of the external monitor from the picked-up image (S208), detects the RGB luminance of a test pattern from the image of the screen so as to exchange it into luminance Y (S209), and stores it in a memory (S210). It is determined whether measurement is performed in whole gradations (S212). Processing from S206 is repeated till the end of measurement in the whole gradations. When an indication exists to correct the gamma of a video output, the gamma characteristic of a video output signal is corrected by only the portion of gamma γ<SB>c</SB>(S215). When it is selected that the incorporated monitor is corrected by gamma, the gamma correction value γ<SB>d</SB>of the incorporated monitor is set so as to allow the gamma of the incorporated monitor to be substantially equal to the system gamma γ<SB>m</SB>of the external monitor (S217). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image pickup apparatus having an image data output function to an external monitor and an image reproduction method used therefor.

2. Description of the Related Art Conventionally, in an image display apparatus having an FED, an SED, or the like, for example, a television receiver, various apparatuses are used when inspection and image quality adjustment are performed before factory shipment. For example, in an automatic characteristic inspection / characteristic adjustment apparatus for a color television receiver, an image difference signal between a basic color television receiver and a color television receiver to be inspected, a test pattern image to be displayed, and a normal image are displayed. The signal difference between the ratio of R, G, B and the ratio of regular R, G, B in each color of the difference signal and color bar is detected, and image quality such as hue, contrast, etc. is reduced so that these detected differences are reduced. Is adjusted electrically without visual observation (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 06-225345

  Thus, an apparatus having a display is shipped in a state in which an image can be displayed with an appropriate image quality by adjusting the image quality of the display before shipment from the factory. However, displays such as FEDs and SEDs perform display processing digitally for each display element divided for each pixel, and therefore, there are variations in light emission characteristics and luminance for each light emitting element and drive train. Therefore, the variation in the light emission characteristics and the brightness becomes remarkable due to the secular change accompanying the use by the user, and the deterioration of the brightness and the brightness unevenness inevitably occur. Of course, not only the luminance unevenness but also various elements related to the display characteristics of the display surface such as the gradation characteristics will change with the passage of time from the factory shipment.

  For this reason, when an image captured with a digital camera is played back on an external monitor such as an FED or SED, the image is displayed on the external monitor with characteristics different from those of the image that the user has viewed and captured on the LCD monitor built in the digital camera. End up.

  The present invention has been made in view of such a conventional problem, and reproduces an image with substantially the same characteristics as at the time of imaging when the captured image is reproduced and displayed on an external monitor or reproduced and printed on a printer. An object of the present invention is to provide an imaging device and an image reproduction method capable of performing the above.

  In order to solve the above-mentioned problem, in the imaging apparatus according to claim 1, based on the imaging unit that captures a reproduction image of a reproduction unit that reproduces an image based on image data, and the image captured by the imaging unit, Detection means for detecting a state of an element related to the reproduction characteristic of the reproduction apparatus, and control of characteristics of image data output to the reproduction apparatus based on the state of the element related to the reproduction characteristic detected by the detection means And control means for outputting the image data whose characteristics are controlled by the control means to the reproducing apparatus.

  Although the reproduction characteristics of the reproduction apparatus are appropriately adjusted at the time of factory shipment or the like, the reproduction characteristics change with aging. Therefore, if a reproduction image of a reproduction device whose reproduction characteristics have been changed is picked up by the imaging means, and the characteristics of the image data output to the reproduction device are controlled based on the picked-up image, it depends on the secular change of the reproduction device. Therefore, it is possible to reproduce an image with substantially the same characteristics as those during imaging.

  The image pickup apparatus according to claim 2 further includes display means for displaying an image picked up by the image pickup means, and selection means for selecting the first mode and the second mode. When the first mode is selected by the selection unit, the control unit determines the characteristics of the image data to be output to the playback device based on the state of the element related to the playback characteristics detected by the detection unit. And the output means outputs the image data whose characteristics are controlled by the control means to the reproduction apparatus, and the second mode is selected. The control means controls the display characteristic of the display means based on the state of an element related to the reproduction characteristic detected by the detection means.

  Therefore, when the first mode is selected, the same function and effect as those of the first aspect of the invention described above can be obtained. When the first mode is selected, the display characteristics of the display unit on the imaging device side are controlled based on the state of the elements related to the detected reproduction characteristics. Therefore, since the image is displayed on the display unit of the imaging device in a display state substantially the same as the state of reproducing the image with the playback device that has changed over time, the characteristics of the image visually recognized on the display unit of the imaging device at the time of imaging, and the imaging The characteristics of an image reproduced later by the reproducing apparatus substantially coincide. As a result, it is possible to reproduce an image with substantially the same characteristics as those at the time of imaging that the user visually recognizes with the display means at the time of imaging without depending on the secular change of the reproducing apparatus.

  Further, in the imaging device according to claim 3, an imaging unit that captures a reproduction image of a reproduction device that reproduces an image based on image data, and the reproduction device based on the image captured by the imaging unit. Based on the state of the element related to the reproduction characteristic detected by the detection means, the detection means for detecting the state of the element related to the reproduction characteristic, the display means for displaying the image captured by the imaging means, Control means for controlling display characteristics of the display means.

  As described above, the playback characteristics of the playback apparatus are properly adjusted at the time of factory shipment or the like, but the playback characteristics change with time. Therefore, if the image capturing unit captures a playback image of the playback device whose playback characteristics have changed, and controls the display characteristics of the display unit included in the image capturing device based on the captured image, the display unit of the imaging device includes: An image is displayed with substantially the same characteristics as when it is played back with a playback device that has changed over time. Therefore, an image having characteristics substantially similar to the characteristics of the displayed image is picked up by the image pickup means and reproduced by the playback device, so that the characteristics of the image visually recognized by the display means of the image pickup device at the time of image pickup and The characteristics of the image reproduced by the reproducing apparatus are substantially the same. As a result, it is possible to reproduce an image with substantially the same characteristics as those at the time of imaging that the user visually recognizes with the display means at the time of imaging without depending on the secular change of the reproducing apparatus.

  The image pickup apparatus according to claim 4 further includes adjustment image output means for outputting image data for characteristic adjustment to the reproduction apparatus, wherein the reproduction apparatus is based on the image data. The reproduced image is picked up in a state where the characteristic adjustment image is reproduced. Therefore, this characteristic adjustment image is reproduced and captured, and based on this, the state of the element related to the reproduction characteristic is detected, so that the state change of the element related to the reproduction characteristic can be detected with high accuracy. .

  In the image pickup apparatus according to claim 5, the image pickup unit includes a correction unit that corrects an image picked up from a different direction into an image from a substantially front direction. Therefore, when the user uses this imaging device to capture a playback image of the playback device, the state of the elements related to the playback characteristics of the playback device can be properly detected even if the playback device captures images from different directions. An image from a substantially front direction can be obtained.

  In the image pickup apparatus according to claim 6, the control unit controls at least one of luminance, gradation characteristics, color temperature, or color balance. Therefore, when this control means controls the characteristics of the image data output to the playback device, the brightness, gradation characteristics, color temperature, color balance, etc. of the playback image in the playback device change due to aging, etc. However, it is possible to reproduce an image with substantially the same characteristics as during imaging without being influenced by this. Further, when the control means controls the display characteristics of the display means included in the imaging device, the brightness, gradation characteristics, color temperature or color balance of the image viewed on the display means of the imaging device during imaging, The luminance, gradation characteristics, color temperature, or color balance of the image reproduced by the reproduction apparatus after the image pickup substantially match. As a result, it is possible to reproduce an image with substantially the same characteristics as those at the time of imaging that the user visually recognizes with the display means at the time of imaging without depending on the secular change of the reproducing apparatus.

  Further, in the imaging device according to claim 7, the reproduction device is an image display device including a display unit that displays an image based on the image data, or a printer that prints an image based on the image data. The imaging unit captures an image displayed on the display unit or an image printed by the printer. Therefore, if this control means controls the characteristics of the image data output to the image display device or printer, even if the image display characteristics of the image display device and the image printing characteristics of the printer change over time, Therefore, it is possible to reproduce an image with substantially the same characteristics as during imaging. Further, when the control means controls the display characteristics of the display means included in the image pickup apparatus, an image visually recognized by the display means of the image pickup apparatus at the time of image pickup and an image reproduced by the image display apparatus or printer after the image pickup are displayed. Luminance, gradation characteristics, color temperature, or color balance substantially match. As a result, it is possible to reproduce an image with substantially the same characteristics as those at the time of imaging visually recognized by the user at the time of imaging at the time of imaging without being influenced by the secular change of the image display device or the printer.

  Further, in the imaging device according to claim 8, a playback image of a playback device that plays back an image based on image data is captured, and based on the captured image, the state of elements related to the playback characteristics of the playback device Based on the detected state of the element related to the reproduction characteristic, the characteristic of the image data to be output to the reproduction apparatus is controlled, and the image data whose characteristic is controlled is output to the reproduction apparatus. . Therefore, by performing each operation according to the described procedure, the same effects as those of the invention according to claim 1 are obtained.

  Further, in the imaging device according to claim 9, a playback image of a playback device that plays back an image based on image data is captured, and based on the captured image, the state of elements related to the playback characteristics of the playback device And the display characteristic of the display means for displaying the image picked up by the image pickup means is controlled based on the state of the element related to the reproduction characteristic detected by the detection means. Therefore, by performing each operation according to the described procedure, the same effect as that of the invention according to claim 3 is obtained.

  As described above, according to the inventions according to claims 1 and 8, the image capturing unit captures the playback image of the playback device whose playback characteristics have changed, and outputs the captured image to the playback device based on the captured image. By controlling the characteristics of the image data, it is possible to reproduce the image with substantially the same characteristics as those at the time of imaging without being influenced by the secular change of the reproducing apparatus.

  According to the third and ninth aspects of the present invention, the image pickup unit picks up the reproduction image of the reproduction device whose reproduction characteristic has changed, and based on the picked-up image, the display unit has the display characteristic of the display unit. By controlling the image, an image can be displayed on the display unit of the imaging apparatus with characteristics substantially the same as those when the image is reproduced by a reproduction apparatus that has changed over time. Therefore, the characteristics of the image visually recognized by the display unit of the imaging device at the time of imaging substantially match the characteristics of the image reproduced by the reproduction device after imaging. As a result, it is possible to reproduce an image with substantially the same characteristics as those at the time of imaging that the user visually recognizes with the display means at the time of imaging without depending on the secular change of the reproducing apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a first embodiment of the present invention. The system according to the present embodiment includes a TV receiver 100, a remote control transmitter 140, and a digital camera 150. The TV receiver 100 includes a tuner 102 connected to an antenna 101, and the tuner 102 is controlled in reception frequency by a channel selection control unit 103. The TV signal of the specific station received by the tuner 102 whose reception frequency is controlled is separated into an audio signal and a video signal by the VIF / SIF selector 104. The separated audio signal is demodulated by the audio multiplex demodulation / PNL 105 and supplied to the speaker 107 via the audio output circuit 106, so that the audio signal is output from the speaker 107.

  The video signal separated by the VIF / SIF selector 104 is input to the video signal processing unit 108. The video signal processing unit 108 includes a video / color signal processing circuit 109, a chroma signal output circuit 110, and a test pattern generation circuit 121. The video signal is output to the display driving circuit 111 via the video / color signal processing circuit 109 and the chroma signal output circuit 110, and the test pattern video signal generated by the test pattern generation circuit 121 is a chroma signal. The data is output to the display drive circuit 111 via the output circuit 308. The display drive circuit 111 is a circuit for driving a flat and rectangular display panel 112 made of an LCD, PDP, FED, etc., and has an X driver 113 and a Y driver 114, and is supplied from the chroma signal output circuit 110. The output is given to the X driver 113.

  The video signal separated by the VIF / SIF selector 104 is further output to the control circuit 115. The control circuit 115 includes a CPU, a ROM that stores a program for operating the CPU, a work RAM, and its peripheral circuits. The display panel 112 has a correction data memory 116 for each display area, and controls the chroma signal output circuit 110, the X driver 113, the Y driver 114, and the like.

  An operation input unit 117, a remote control decoder 118, and a screen measurement unit 119 are connected to the control circuit 115. The operation input unit 117 is provided with various operation buttons such as a power button and a channel selection button. Infrared light receiving sensor 120 is connected to remote control decoder 118, and infrared light receiving sensor 120 receives an infrared signal transmitted from remote control transmitter 140.

  The screen measurement unit 119 temporarily stores an image input from a video / audio input circuit 129 (described later) and transmitted from the digital camera 150, and an image temporarily stored in the image memory 125. A coordinate conversion / distortion correction unit 126 that performs coordinate conversion and distortion correction, and a detection unit 127 that detects the state of elements related to display characteristics such as luminance unevenness, gamma characteristics, and color balance of the image subjected to coordinate conversion and distortion correction. have. The state of elements related to image quality, such as luminance unevenness, gamma characteristics, and color balance, detected by the detection unit 127, is input to the control circuit 115.

  The TV receiver 100 is provided with a video / audio input terminal 128, and a video output terminal 151 of the digital camera 150 is connected to the video / audio input terminal 128 via a cable 190. The video / audio input terminal 128 is connected to the image memory 125 via the video / audio input circuit 129.

  A DC / DC converter 130 is connected to the Y driver 114 of the display drive circuit 111. In addition, the digital camera 150 includes an electronic viewfinder / monitor display unit 152 and the like. The remote control transmitter 140 is a substantially rectangular box, and operation keys 141 are arranged on the upper surface.

  FIG. 2 is a block diagram showing a circuit configuration of the remote control transmitter 140. The remote control transmitter 140 includes a microcomputer 142, to which the operation key 141 is connected and a transmission code encoder 143 is connected. The transmission code encoder 143 is connected to the transmission code encoder 143 via a transmission unit 144. Infrared LED 45 is connected.

  FIG. 3 is a block diagram showing a circuit configuration of the digital camera 150. In the figure, a CCD 153 converts a subject image formed by an optical system into an electrical signal and outputs the electrical signal, and an amplifier 154 amplifies the electrical signal. The A / D converter 155 converts the amplified analog signal into a digital signal and inputs the digital signal to a TG (Timming Generator) 156. The TG 156 generates a timing signal for controlling a driving circuit (Driver) 157 that drives the CCD 153, and the driving circuit 157 drives the CCD 153 based on the timing signal from the TG 156.

  The compression / decompression unit 158 performs compression / decompression processing on the digital image data captured via the TG 156 by encoding / decoding. SG (Signal Generator) 159 adds a synchronization signal or the like to the digital image data to create a digital video signal. The created digital video signal is stored in a VRAM (video RAM) 160 and is given to the video output terminal 151 and the electronic finder / monitor display unit 152 via a D / A converter 161 and an amplifier 162. The electronic viewfinder / monitor display unit 152 displays an image by driving the liquid crystal based on the input analog video signal.

  The key input unit 163 is provided with a power key that is operated when the power is turned on / off, a shutter key that is operated when image data is stored in a flash memory 168 described later, and other function keys.

  The CPU 164 operates while using a part of the RAM 166 as a work area based on the key operation information input from the key input unit 163 and the program stored in the ROM 165. The process is executed and each part is controlled. The DRAM 167 is a memory that temporarily stores digital image data captured by an instruction from the CPU 164. The flash memory 168 has a plurality of storage areas, and stores compressed image data in each storage area. The I / O port 169 is an interface that inputs and outputs image data converted into a serial signal, and is connected to a serial I / O terminal 170.

  In the present embodiment having the above configuration, when the user uses the system, the user fixes the digital camera 150 on the front floor surface of the display panel 112 at a position where the entire display panel 112 can be photographed. Keep it. In this state, the user operates the remote control transmitter 14 as shown in the flowchart of FIG. First, based on the state of the operation key 141 that is constantly monitored, it is determined whether or not there has been a key operation (step R1), and the system waits until there is a key operation. If there is a key operation, it is determined whether or not it is an operation of a “screen adjustment key” (step R2). If the operation is not a “screen adjustment key” operation but another key operation such as a channel change key or a volume adjustment key, the device code of the remote control transmitter 141 and the code corresponding to the key are transmitted in infrared. (Step R3). If it is an operation of the “screen adjustment key”, the code of the “screen adjustment key” is transmitted in infrared together with the device code of the remote control transmitter 141 (step R3).

  On the other hand, the digital camera 150 operates as shown in the flowchart of FIG. 4B when the CPU 164 executes processing based on a program stored in the ROM 165. It is determined whether or not the shooting mode is set (step C1). If the shooting mode is not set, other processing is executed (step C2). If the shooting mode is set, the camera unit performs a shooting operation (step C3). That is, the shutter key operation provided in the key input unit 163 or the signal taken from the CCD 153 is automatically compressed by the compression / expansion unit 158 without being accompanied by the operation of the shutter key, and stored in the flash memory 168. .

  Thereby, the image of the display surface of the display panel 112 is stored in the flash memory 168. At this time, since a predetermined test pattern or color chart is displayed on the display panel 112 as will be described later, the display panel 112 in a state where the test pattern or color chart is displayed on the flash memory 168. Will be stored. Subsequently, image data including the screen of the display panel 112 is output from the video output terminal 151. As a result, the image data including the test pattern screen is transmitted to the TV receiver 100 side via the cable 190.

  On the other hand, that is, the TV receiver 100 operates as shown in the flowchart of FIG. 4C in accordance with control by the control circuit 115 in a state where the power is on and the display panel 112 is performing display operation. To do. The remote control code transmitted from the remote control transmitter 140 side by the processing in step R3 or step R4 is received and decoded by the remote control decoder 118 (step T1). Then, based on the decoded remote control code, it is determined whether or not the remote control code of the remote control transmitter 140 corresponding to the TV receiver 200 has been received (step T2). If it is not the remote control code of the corresponding remote control transmitter 140, the process returns without executing the subsequent processing. If it is the remote control code of the corresponding remote control transmitter 140, it is determined whether or not the “screen adjustment key” code has been received (step T3), not the “screen adjustment key” code but the channel change key or volume control. If it is another code such as a key, the processing corresponding to the other key is executed (step T4).

  When the “screen adjustment key” code is received, a predetermined test pattern or color chart is generated by the test pattern generation circuit 121 and displayed on the display panel 112 (step T5). Therefore, as described above, when the digital camera 150 performs the photographing operation in this state, the flash memory 168 stores image data including the display panel 112 in a state where the test pattern or the color chart is displayed. The image data is transmitted to the TV receiver 100 side via the cable 190.

  Subsequently, the image transmitted from the digital camera 150 side to the TV receiver 100 side is input from the video / audio input terminal 128 (step T6), and the image area of the display panel 112 is extracted from the input image (step T6). T7). However, in the image area of the display panel 112, since the digital camera 150 is taken on the front floor surface of the display panel 112 as described above, the display panel 112 is imaged obliquely from below. In this case, the rectangular display panel 112 is captured in a trapezoidal shape. Therefore, by converting the image data of the captured image captured by the rectangular display panel 112 into a trapezoid, the image data that is the original rectangle when the display panel 112 is viewed from substantially the front is generated. (Step T8).

  Next, based on the user's operation at the operation input unit 117, it is determined whether or not luminance unevenness adjustment processing has been instructed (step T9). When the luminance unevenness adjustment process is instructed, a luminance unevenness region is detected from the transmitted image (screen image) of the display surface of the display panel 112 (step T10). Then, it is determined whether or not the detected brightness unevenness in the brightness unevenness area is larger than a predetermined value (step T11). If not large, the process proceeds from step T11 to step T23 without performing the process of step T12. On the other hand, if it is larger, the display drive circuit 111 is controlled in accordance with the luminance unevenness region and the luminance unevenness to adjust the luminance of the region (step T12).

  If the result of determination in step T9 is that no adjustment of luminance unevenness has been instructed, it is determined whether or not gamma adjustment has been instructed (step T13). When gamma adjustment is instructed, the gradation characteristic of the output luminance is detected from the transmitted image (screen image) of the display surface of the display panel 112 (step T14). Then, a gamma characteristic is calculated from the output luminance data which is the gradation characteristic of the detected output luminance (step T15), and it is determined whether or not the calculated gamma is different from the set value currently set on the display panel 112. (Step T16). If they are the same without being different from the set value, the process proceeds from step T16 to step T23 without performing the process of step T17. If they are different, the gamma characteristic of the display panel 112 is adjusted to a predetermined gamma characteristic that is set, that is, a predetermined gamma characteristic that should be set when the gamma stored in the ROM of the control circuit 115 is different. (Step T17).

  If gamma adjustment is not instructed as a result of the determination in step T13, it is determined whether or not color temperature or color balance adjustment is instructed (step T18). When color temperature or color balance adjustment is instructed, output chromaticity coordinates are detected from the transmitted image (screen image) of the display surface of the display panel 112 (step T19). Then, a color temperature or a color balance is calculated from the detected chromaticity coordinates (step T20), and it is determined whether or not the calculated color balance is different from a set value currently set on the display panel 112 (step T21). ). If they are the same without being different from the set value, the process proceeds from step T21 to step T23 without performing the process of step T21. If they are different, the color temperature or color balance of the display panel 112 should be set when the predetermined color temperature or color balance, that is, the color temperature or color balance previously stored in the ROM of the control circuit 115 is different. The predetermined color temperature or color balance is adjusted (step T22). When the above processing is completed, the display of the test pattern or the color chart on the display panel 112 is stopped and the display is returned to the normal display (step T23).

  FIG. 5 is a flowchart showing a processing procedure for detecting and correcting luminance unevenness of the display panel 112 in the present embodiment, and FIG. 6 is an operation transition diagram corresponding to this flowchart. The control circuit 115 executes processing as shown in the flowchart of FIG. 5 based on the program in a state where the power of the TV receiver 100 is on. At this time, an image of an arbitrary broadcast program or the like may be displayed on the display panel 112, the display panel 112 may be operated to display without displaying the image, or any one described later. Such a test pattern may be displayed on the display panel 112.

  First, it is determined whether or not it is time to perform screen characteristic adjustment processing based on an instruction by a user operation on the operation input unit 117 or a periodic adjustment process cycle of screen characteristics programmed in advance ( In step S101), when it is not time to perform the adjustment process of the screen characteristics, the process proceeds to another adjustment process (step S102).

  In addition, when it is time to perform the adjustment process of the screen characteristics, the display panel 112 (FIG. 6A) that is performing the display operation is photographed (FIG. 6B), and the video output signal is output from the digital camera 150. Input (step S103). Therefore, as a result of the processing in step S103, a captured image P1 including the entire image of the display panel 112 is obtained as shown in FIG. 6C. However, since the captured image P1 is obtained by capturing the display panel 112 from an arbitrary angle, the rectangular display panel 112 is captured in a trapezoidal shape as shown in FIG. 6C. Therefore, a screen image area that is the display surface of the display panel 112 is cut out from the image data of the captured image captured by the rectangular display panel 112 in a trapezoid shape, and the cut-out screen image area is subjected to coordinate conversion or distortion. By performing the correction process, image data that is an original rectangle when the display surface of the display panel 112 is viewed from substantially the front is generated (step S104, FIG. 6D). By the processing in step S104, an image P2 in which the display panel 112 is an original rectangle is obtained as shown in FIG.

  Next, it is determined whether or not it is time to perform luminance unevenness adjustment processing based on an instruction by a user operation on the operation input unit 117 or a periodic luminance unevenness adjustment period programmed in advance ( If it is not time to perform the luminance unevenness adjustment process, the process proceeds to other screen adjustment processes such as gradation characteristics, color temperature, and color balance (step S106).

  Further, when it is time to perform luminance unevenness adjustment processing, the luminance of each pixel in each region is detected from the imaging data of the image corrected in step S104 (step S107, FIG. 6F). . Here, as shown in FIG. 6E, each area is an area in which the display panel 112 virtually divides the original rectangular image P2 into a plurality of equal areas. It is each area | region divided | segmented into.

  Subsequently, the luminance value for each block and matrix is calculated from the luminance value for each pixel detected in step S107, and the luminance values for the screen average, matrix average, and block average are calculated (step S108). Here, the block is a unit whose luminance can be controlled, which is composed of a pixel group existing in a range smaller than the area. Further, the luminance value for each matrix is the luminance value of each row composed of a group of pixels arranged in the X direction on the display panel 112 and the luminance of each column composed of a group of pixels arranged in the Y direction. Value. The screen average luminance value is an average value of the luminance values of the pixels of the entire screen. The matrix average luminance value is the average value of the luminance values of the pixels belonging to each row and column, and the block average luminance value is the average value of the luminance values of the pixels belonging to the block.

If the luminance value or the average luminance value is calculated in this way,
(1) Luminance difference of each matrix = Luminance value of each matrix−Brightness value of screen average (2) Luminance difference of each block = Brightness value of each block−Average luminance value of the matrix (3) Brightness difference of each pixel = The luminance value of each pixel−the average luminance value of the block is calculated (step S109).
Here, in Equation (2), the “average luminance value of the matrix” is the average luminance value of the row and column intersecting the block, and in Equation (3), “the average luminance value of the block” Is a block average luminance value of the block to which the pixel belongs.

  Next, it is determined whether or not the first row and column in the display panel 112 is a matrix having higher brightness than the other (step S110). This determination is made based on whether or not the luminance difference of the matrix calculated by the equation (1) is greater than or equal to a predetermined value. If the result of this determination is that the brightness difference between the row and column is not greater than or equal to a predetermined value, the process proceeds to step S112 without performing the process of step S111. However, if the luminance difference of the row or column is greater than or equal to a predetermined value and the luminance is higher than others (see FIG. 6G), the luminance correction of the matrix is performed so as to reduce the driving voltage of the matrix. Data is set and stored in the correction data memory 116 (step S111). At this time, if the luminance difference of only the row or only the column is equal to or greater than a predetermined value and the luminance is higher than the others, the luminance correction of the matrix is performed so as to reduce the driving voltage only for the row or only the column. Data is set and stored in the correction data memory 116.

Subsequently, it is determined whether or not the matrix is lower in brightness than the other (step S112). This determination is made based on whether or not the luminance difference of the matrix calculated by the equation (1) is less than a predetermined value. As a result of the determination, if the luminance difference between the row and the column is not less than the predetermined value, the process proceeds to step S113 without performing the process of step S113. However, if the luminance difference between the row and the column is less than a predetermined value and the luminance is lower than others (see FIG. 3G), the luminance correction of the matrix is performed so as to increase the driving voltage of the matrix. Data is set and stored in the correction data memory 116 (step S113). At this time, as described above, when the luminance difference of only the row or column is equal to or greater than a predetermined value and the luminance is lower than the others, the matrix is set so that the driving voltage of only the row or column is lowered. Brightness correction data is set and stored in the correction data memory 116.
The predetermined value used in step S110 is preferably a positive value and the predetermined value used in step S112 is preferably a negative value, but both may be the same value.

  Next, it is determined whether or not the matrix that has undergone the processes in steps S110 to S113 is the last matrix in the display panel 112 (step S114). If it is not the last row, the next matrix is selected (step S115), and the processing from step S110 is repeated. If the processes of steps S110 to S113 have been performed up to the last matrix (step S114; YES), the control circuit 115 controls the X driver 113 and the Y driver, and the drive data of each matrix is converted into the correction data memory 116. Based on the brightness correction data of the matrix, the drive signal of the matrix stored in (5) is corrected and output (step S116, FIG. 6 (H)). As a result, as shown in FIG. 6I, luminance unevenness in units of rows and columns is corrected.

  Further, processing similar to the matrix described above is executed for the blocks and pixels of the display panel 112. That is, it is determined whether or not the first block or pixel in the display panel 112 is a block or pixel having higher brightness than the other (step S117). This determination is made based on whether or not the luminance difference between the block and the pixel calculated by the equations (2) and (3) is equal to or greater than a predetermined value. If the result of this determination is that the luminance difference between the block and pixel is not greater than or equal to a predetermined value, the process proceeds to step S119 without performing the process of step S118. However, if the luminance difference of the row or column is greater than or equal to a predetermined value and the luminance of the block or pixel is higher than the others, the luminance correction data of the block or pixel is set so as to reduce the drive voltage of the block or pixel. It is set and stored in the correction data memory 116 (step S118).

Subsequently, it is determined whether or not the pixel is a block or pixel having a lower luminance than the other (step S119). This determination is made based on whether or not the luminance difference between the block and the pixel calculated by the equations (2) and (3) is less than a predetermined value. As a result of the determination, if the luminance difference between the block and the pixel is not less than the predetermined value, the process proceeds to step S1121 without performing the process of step S120. However, if the luminance difference between the block and the pixel is less than a predetermined value and the luminance is lower than that of the other block or pixel, the luminance correction data of the block or pixel is set to increase the drive voltage of the block or pixel. It is set and stored in the correction data memory 116 (step S120).
Note that the predetermined value used in step S117 is a positive value and the predetermined value used in step S119 is preferably a negative value, but both may be the same value.

  Next, it is determined whether or not the block or pixel subjected to the above steps S117 to S120 is the last block or pixel in the display panel 112 (step S121). If it is not the last row, the next block and pixel are selected (step S122), and the processing from step S117 is repeated. Then, if the processing of steps S117 to S120 is performed up to the last block and pixel (step S121; YES), the control circuit 115 controls the X driver 113 and the Y driver, and the drive signal of each block and pixel is The block and pixel drive signals stored in the correction data memory 116 are corrected and output based on the luminance correction data of the block and pixels (step S123, FIG. 6J). As a result, as shown in FIG. 6K, the luminance unevenness of the block unit and the pixel unit is also corrected.

  FIG. 7 is a diagram showing a configuration example of a test pattern image when a test pattern or a color chart is displayed on the display panel in the present embodiment. In the figure, (a) shows luminance 0% (black), luminance 10% (gray), luminance 20% (gray) to 90% for detecting and adjusting luminance gradation characteristics such as gamma (γ) characteristics. An example of a grayscale image for each gradation, such as (gray) and luminance 100% (white), is shown. (B) is similar to an SMPTE color bar (SMPTE: American Film and Television Engineers Association) for detecting and adjusting color temperature, color balance, color reproducibility, etc., white, yellow, cyan (light blue), An example of a color chart image in which color samples such as green, magenta (red purple), red, blue, and black are arranged is shown. (C) similarly shows an example of an image of a composite test pattern for detecting and adjusting color temperature, color balance, color reproducibility, and the like.

  FIG. 8 is an example of a dynamic or test pattern in which gray scales, color chart color samples, etc. are sequentially switched in a time-division manner and displayed within the same partition area. Even when only the same point on the screen is photographed or detected, a plurality of different color sample patterns can be photographed or detected in order.

(Second Embodiment)
FIG. 9 is a block diagram showing a second embodiment of the present invention. The system according to the present embodiment includes a TV receiver 200 and a digital camera 250. The TV receiver 200 includes a tuner 202 connected to an antenna 201, and the tuner 202 is controlled in reception frequency by a channel selection control unit 203. The video signal of the TV signal at the specific station received by the tuner 202 whose reception frequency is controlled is input to the video signal processing unit 208 via the video IF 204. The video signal processing unit 208 includes a video / color signal processing circuit 209 and a chroma signal output circuit 210, and the video signal is displayed and driven via the video / color signal processing circuit 209 and the chroma signal output circuit 210. It is output to the circuit 211. The display driving circuit 211 is a circuit for driving a flat and rectangular display panel 212 made of LCD, PDP, FED, etc., and has an X driver 213 and a Y driver 214, and is supplied from the chroma signal output circuit 210. The output is given to the X driver 213.

  The video signal from the video IF 204 is further output to the control circuit 215. The control circuit 215 includes a CPU, a ROM storing a program for operating the CPU, a work RAM, and peripheral circuits thereof. The chroma signal output circuit 210, the X driver 213, the Y driver 214, and the like. Control each part. An operation input unit 217 and a remote control decoder 218 are connected to the control circuit 215. The operation input unit 217 is provided with various operation buttons such as a power button and a channel selection button. An infrared light receiving sensor 220 is connected to the remote control decoder 218.

  The TV receiver 200 is provided with a video / audio input terminal 228 and an RGB input unit 229 connected to the video IF 204. A video output terminal 251 of a digital camera 250 is connected to the video / audio input terminal 228 and the RGB input unit 229 via cables 240 and 241, respectively. The digital camera 250 includes a built-in monitor 252 configured by an LCD or the like. have.

  FIG. 10 is a block diagram showing a circuit configuration of the digital camera 250. This circuit is provided with a control circuit 254 having a CPU 253, and a program memory 255 and a data memory 256 storing programs are connected to the CPU 253. Then, based on the program stored in the program memory 255, the CPU 253 operates using a part of the data memory 256 as a work area, whereby the control circuit 254 controls each unit. The power supply circuit 257 supplies power from the battery 258 to the control circuit 254, and a strobe 259 is connected via a strobe drive circuit 260.

  The imaging control circuit 261 controls the lens driving unit 262, the shutter aperture driving unit 263, the CCD driving circuit 264, and the imaging signal processing unit 265 in accordance with a command from the control circuit 254. The lens driving unit 262 controls the lens 266. The shutter diaphragm driving unit 263 drives the diaphragm 267 having a shutter function, and the CCD driving circuit 264 drives the image sensor 268. The imaging signal processing unit 265 is a CDS 269 that processes a signal from the imaging element 268, an AGC 270 that amplifies the signal from the CDS 269, an A / D converter 271 that performs A / D conversion on the signal from the AGC 270, and A / D converted. A color separation unit 272 that separates digital image data into RGB, an amplification unit 273 that amplifies the separated R, G, and B data, a color interpolation correction unit 274 that performs color interpolation and color correction on the data from the amplification unit 27, a color A gamma correction unit 275 that performs gamma correction on the image data that has undergone interpolation and color correction, a color MTX 276 that outputs the gamma-corrected RGB image data to the control circuit 254, and outputs YUV data to the image buffer 277, and the amplification unit A WB control unit 78 for controlling 273 is provided.

  The luminance / chromaticity measuring unit 79 includes an R luminance measuring unit 71, a G luminance measuring unit 72, a B luminance measuring unit 73, which measure R, G, and B luminances separated by the color separation unit 272. A chromaticity coordinate / color temperature measurement unit 74 that measures chromaticity coordinates and color temperature based on the luminance measured by each of the measurement units 71 to 73 is provided. Further, the color balance measuring unit 75 that measures the color balance based on the measurement result of the chromaticity coordinate / color temperature measuring unit 74, and the gray scale gradation is measured based on the luminance measured by the measuring units 71 to 73. A gray scale gradation measurement unit 267 and a display gamma characteristic measurement unit 77 that measures display gamma characteristics based on the measurement result of the gray scale gradation measurement unit 76 are provided.

  Further, an operation input unit 278 is connected to the control circuit 254 via the input circuit 279, an external data input / output terminal 280 such as a USB is connected via the input / output IF 281 and the external memory medium 282 is connected to the external memory IF circuit 283. The external data input / output terminal 280 is connected to the printer device 284, the PC, and the TV monitor 285.

  Further, an image processing unit 286, a compression encoding / decompression decoding unit 289, display gamma correction units 290 and 295, and a test pattern image generation unit 298 are connected to the control circuit 254. The image processing unit 286 performs processing for displaying an image on the built-in monitor 252, and includes a display gamma correction unit 287 and a color correction unit 288, and the compression encoding / decompression decoding unit 289 includes It performs compression encoding and decompression decoding of image data. The display gamma correction unit 290 is connected to the video signal output unit 293 and the RGB output unit 294 via the color correction unit 291 and the video signal conversion unit 292, and the video signal output unit 293 and the RGB output unit 294 It is connected to the video output terminal 251 (FIG. 9). The display gamma correction unit 295 is connected to the display drive unit 297 via the color correction unit 296, and the display drive unit 297 drives the built-in monitor 252 for display. The test pattern image generation unit 298 generates the above-described test pattern and color chart.

  In the present embodiment having the above-described configuration, the digital camera 250 performs the processing of the CPU 253 based on the program stored in the program memory 255 and starts the control circuit 254, whereby the flowcharts of FIGS. It operates as shown in It is determined whether or not an instruction to set an image reproduction mode or an external output of a video signal is instructed by an operation of the operation input unit 278 by the user (step S201). If not instructed, the process proceeds to other processing (step S201). S202). When setting of the image reproduction mode or external output of the video signal is instructed, whether or not automatic correction of the video signal in accordance with the external monitor characteristics is selected by the operation of the operation input unit 278 by the user. (Step S203), if not selected, the process proceeds to step S242 in FIG. When automatic correction of the video signal according to the external monitor characteristics is selected, guidance indicating that “the camera should be directed to the foreign monitor screen” is displayed on the built-in monitor 252. The user who visually recognizes the guidance fixes the digital camera 250 in a state where the lens 266 faces the display panel 212 of the TV receiver 200.

  Next, it is determined whether or not gamma characteristic correction has been selected by an operation on the operation input unit 278 (step S205). If not selected, the process proceeds to step S218 described later. If gamma characteristic correction is selected, a test pattern (gray scale or the like) for gamma measurement is generated (step S206), and this test pattern is converted from the video output terminal 251 to the TV receiver 200 side as a continuous image. Output (step S207). As a result, the test pattern for gamma measurement is displayed on the display panel 212 of the TV receiver 200. At this time, since the lens 266 of the digital camera 250 faces the display panel 212 of the TV receiver 200 as described above, the test pattern displayed on the display panel 212 is imaged on the image sensor 268. In addition, images are taken at fixed timings and displayed on the built-in monitor 252.

  Then, the digital camera 250 extracts an image (test pattern image) on the external monitor screen (display panel 212) from the captured image (step S208). Further, the RGB luminance of the test pattern is detected from the image on the screen and converted to luminance Y (step S209), and the luminance Y for each gradation of the test pattern (test pattern itself) and the imaging measurement luminance Y (in step S209). The converted luminance Y) is stored in the data memory 256 in association with each other (step S210). Subsequently, the test pattern is switched to the next gradation (step S211), it is determined whether or not measurement has been performed for all gradations (step S212), and from step S206 until measurement for all gradations is completed. Repeat the process. Therefore, when the determination in step S212 is YES, the data memory 256 stores the luminance Y for each gradation of the test pattern and the imaging measurement luminance Y in association with each other in all gradations. Become.

Next, the system gamma γ _m of the external monitor screen is calculated from the screen measurement luminance (shooting measurement luminance) for each gradation and displayed on the built-in monitor 252 (step S213), and the operation input unit by the user who has visually recognized this is displayed. It is determined whether or not an instruction to correct the gamma of the video output has been given by the operation at 278 (step S214). If this instruction is not given, the process proceeds to step S216 without performing the process of step S215. Further, when the instruction has been made, by the following examples the following equation, the gamma characteristic of the video output signal is set to correct only gamma gamma _c (step S215).
(Example) γ _c = 1.0 / γ _m

Further, it is determined whether or not gamma correction for the built-in monitor 252 is selected by the operation of the operation input unit 278 (step S216). If not selected, the process of step S217 is performed without performing the process of step S217. The process proceeds to S218. When gamma correction for the built-in monitor 252 is selected, the gamma correction value γd of the built-in monitor 252 is set so that the gamma of the built-in monitor 252 is substantially equal to the system gamma γ _m of the external monitor according to the following example: Is set (step S217).
(Example) γ _d = γ _m / 1

  Further, it is determined whether or not an automatic correction of the color temperature is instructed by an operation on the operation input unit 278 (FIG. 12, step S218). If not instructed, the process proceeds to step S228 described later. If automatic correction of the color temperature is instructed, a test pattern (color chart) for color temperature or a white / gray pattern is generated (step S219), and this test pattern is used as a continuous image from the video output terminal 251 to the TV. Video is output to the receiver 200 side (step S220). Further, as described above, an image (test pattern image) of the external monitor screen (display panel 212) is extracted from the captured image (step S221), and each RGB brightness of the test pattern is detected from the extracted screen image (step S221). Step S222). Subsequently, chromaticity coordinates are calculated from the detected RGB luminances, and a color temperature is calculated from the calculated chromaticity coordinates and displayed on the built-in monitor 252 (step S223).

  It is determined whether or not an instruction to correct the color temperature of the video output has been given by the operation of the operation input unit 278 by the user who has visually recognized this (step S224). If there is no instruction, the process of step S225 is performed. Without performing, the process proceeds to step S226. If the instruction is given, the color temperature correction value for the video output is set so that the color temperature of the external monitor becomes a desired color temperature (step S225). Further, it is determined whether or not the correction of the color temperature of the built-in monitor 252 has been selected by the operation of the operation input unit 278 (step S226). If not selected, the process of step S227 is not performed and step S228 is performed. Proceed to If correction of the color temperature of the built-in monitor 252 is selected, the color temperature correction value is set so that the color temperature of the built-in monitor 252 is substantially equal to the color temperature of the external monitor (step S227).

  Further, it is determined whether or not automatic color balance correction has been selected by the operation of the operation input unit 278 (step S228). If not selected, the process proceeds to step S242 described later. When automatic correction of color balance is selected, a color sample test pattern for color balance measurement is generated (step S229), and the test pattern is converted from the video output terminal 251 to the TV receiver 200 as a continuous image. Output (step S230). As described above, an image (test pattern image) of the external monitor screen (display panel 212) is extracted from the captured image (step S231), and the RGB luminance of the test pattern is detected from the extracted screen image (step S231). S232). Further, chromaticity coordinates are calculated from the detected luminances of RGB (step S233), and the chromaticity coordinates of each color sample of the test pattern are associated with the chromaticity coordinates measured in step S233 in the data memory 256. Store (step S234). Subsequently, the test pattern is switched to the next color sample test pattern (step S235), and it is determined whether or not the measurement has been completed for all the color samples (step S236). The processing from S230 is repeated. Therefore, when the determination in step S236 is YES, the chromaticity coordinates of all the color samples and the chromaticity coordinates measured from the captured image are stored in the data memory 256 in association with each other.

  Next, the color balance of the external monitor is calculated from the chromaticity coordinates of each corresponding color sample and displayed on the built-in monitor 252 (step S237), and the video output is performed by the operation of the operation input unit 278 by the user who has visually recognized this. It is determined whether or not an instruction to correct the color balance is made (step S238). If this instruction is not given, the process proceeds to step S240 without performing the process of step S239. If the instruction is given, the color balance correction value is set so that the external monitor has a desired color balance (step S239). Further, it is determined whether or not the correction of the color balance of the built-in monitor 252 has been selected by the operation of the operation input unit 278 (step S240). If not selected, the process of step S241 is not performed and step S242 is not performed. Proceed to When the correction of the color balance of the built-in monitor 252 is selected, the color balance correction value is set so that the color balance of the built-in monitor 252 is substantially equal to the color balance of the external monitor (step S241).

  Subsequently, the selected image is decoded and reproduced (step S242), and the reproduced image is displayed on the built-in monitor 252 based on the set gamma, color temperature, and color balance of the built-in monitor (step S243). Furthermore, the video signal of the reproduced image is output from the video output terminal 251 based on the set video output gamma / color temperature / color balance (step S244).

  In the series of flowcharts shown in FIGS. 12 and 13, the video signal is controlled according to the monitor characteristics of the TV receiver 200, but the printer device 284 is targeted for the printer device 284. The digital camera 250 may be controlled according to the printing characteristics. In this case, a plurality of test pattern images may be printed out in advance by the printer device 284, and the processing from step S205 onward may be executed on the plurality of test pattern print images.

FIG. 13 is a diagram illustrating a setting example of gamma characteristics in the digital camera and the monitor TV. In general, the input / output characteristics of a CRT, TV monitor, etc. are said to have a non-linear luminance characteristic in the original cathode ray tube (CRT) and about gamma = 2.2 to 2.5. For example, as shown in FIG. 13, in a standard digital camera, the input / output characteristics of luminance at the time of image recording in the image sensor are gamma (γ), which is a standard input / output characteristic of a general CRT or TV monitor device. = In accordance with 2.2 etc., the gamma characteristic at the time of image recording is
γ = 1 / 2.1 = 0.45 (ie, Y = X ^0.45 )
When the image data is converted to gamma-corrected image data and recorded and output to an external monitor as a video signal output, the video signal thus corrected and adjusted is output.

At this time, when the video output of the image captured by the digital camera is input to a standard TV monitor whose input / output characteristics are set to γ = 2.2 and reproduced, the input / output characteristics (Y = Combined with Y = ^X2.2 ), the total input / output characteristics (system gamma) is
(X ^0.45 ) ^2.2 = X ^1.0 (ie, system gamma = 1.0)
Therefore, even if the input / output characteristics of the CRT or monitor are non-linear, the total input / output characteristics for playback are linear Y = X ^1.0 , so playback with natural gradation characteristics is possible. It will be a mechanism for viewing.

However, even if the TV monitor or the TV receiver is different from the standard gamma characteristic, or the gamma (γ) = 2.2, the user greatly adjusts the output brightness and contrast. Or a TV monitor connected to a personal computer is often used after being corrected to a different gamma characteristic depending on image settings in the OS or application. For example, γ = 1, which is standard in DTP and printing Some OSs support a screen characteristic setting function with .8 (Y = X ^1.8 ) as a standard.

When outputting image data captured by a digital camera to such a TV monitor or TV receiver having a gamma characteristic different from γ = 2.2, for example, γ = 1, as shown in FIG. .8 TV monitor image or TV receiver,
Reproduced image system gamma γ = 0.45 × 1.8 = 0.81
That is, Y = (X ^0.45 ) ^1.8 = X ^0.81
If black to white are the same, there is a nonlinear input / output characteristic that is convex upward, and there is a problem that the luminance of the intermediate gradation is reproduced slightly higher (brighter).

FIGS. 15 to 17 show the case where the gamma characteristic of the external TV monitor and the gamma characteristic of the output signal of the digital camera are automatically adjusted according to the gamma characteristic of the external TV monitor in the embodiment described above. An operation example is shown. FIG. 15 shows an example of the operation when the gamma characteristic of the external monitor is measured by taking a screen image with a digital camera. By this, the system gamma is obtained by combining the shooting and recording gamma characteristic of the digital camera and the display characteristic of the external monitor. If γ _m is measured as γ _m = 0.81, for example, as shown in FIG. 16, if the measured system γ = 0.81 and the desired system γ = 1.0, the video output circuit The correction value γ _c = 1.0 / γ _m = 1 // 0.81 = 1.23, the video signal output is subjected to γ correction processing and output from the video signal output terminal (or RGB output terminal). That's fine.

In this case, Y = ((X ^0.45 )) ^1.23 = X ^1.0 even when the display γ = 1.8 (system gamma 0.81) is connected to an external monitor different from the standard. System γ can be corrected to 1.0, so images can be reproduced with gradation characteristics similar to those of other TV monitors set to standard γ = 2.2 and built-in LCD monitors. Can be appreciated.

On the other hand, as shown in FIG. 17, the screen characteristics of the LCD monitor built in the digital camera may be set to be corrected and adjusted in accordance with the detected screen characteristics such as the gamma characteristic of the external monitor. it can. That is, in order to make the system gamma of the built-in LCD monitor substantially equal to that of the external monitor, when the measured system γ _m = 0.81 of the external monitor and the system γ = 1 of the built-in LCD monitor source, the display of the built-in LCD monitor the gamma correction gamma _d is subjected to, by the ratio of the measured system gamma _m and original system gamma, for example, built-in LCD monitor display gamma correction γ _d = γ _m / (original γ) = 0.81 / 1 .0 = 0.81 etc. may be set to be corrected. In this case, the input / output characteristics of the system when reproducing on the built-in LCD monitor are Y = ((X ^0.45 ) ^0.81 ) ^2.2 = X ^0.81 and system gamma γ = 0.81 Therefore, even if the external monitor is different from the standard (system γ = 0.81), the camera shooting operation and captured image can be displayed on the built-in monitor screen with the same gradation characteristics as this external monitor. You can check.

FIG. 18 shows a method for measuring by outputting a test pattern image representing a gray level characteristic of luminance and a gamma characteristic (input / output characteristic of luminance) in gray scale from a camera to an external monitor. Storing in memory the grayscale measurement output luminance data of each input value as a table (Table) data (step S301), or a function representing the input-output characteristics of the monitor measured, fit to Y = X ^gamma, gamma (gamma ) Is obtained (step S302).

  FIG. 19 shows an example of a correction method by digital processing when the gamma characteristics and gradation characteristics of an image data signal are corrected by luminance distribution data conversion processing and output, such as video signal output gamma correction processing.

  FIG. 20 is a diagram illustrating a configuration example of the video signal of the digital camera unit, or the gamma correction circuit and the color temperature correction circuit of the internal LCD monitor, and without changing the image data, An example of a circuit configuration for correcting color temperature, color balance, and the like is shown. As shown in the figure, the display gamma correction circuit 301 corrects the display γ of the built-in monitor for each of R, G, and B, and outputs R ′, G ′, and B ′. The color temperature correction and color balance correction circuit 302 corrects the color temperature and color balance of the built-in monitor by controlling the gain for each of R ′, G ′, and B ′, and sets R ″, G ″, and B ″. The R ″, G ″, and B ″ corrected for the color temperature and color balance are supplied to the display drive circuit 304 of the built-in LCD monitor 306 via the image data memory 303, and the display drive circuit 304 The display unit 305 is driven in accordance with “, G”, B ”.

  On the other hand, the video output display gamma correction circuit 307 performs gamma correction on the video output signal for each of R, G, and B, and outputs R ′, G ′, and B ′. The color temperature correction and color balance correction circuit 308 corrects the color temperature and color balance of the video output signal by controlling the gain for each of R ′, G ′, and B ′, and R ″, G ″, and B ″. The R ″, G ″, and B ″ corrected for the color temperature and color balance are output as RGB and converted into YUV data by the color matrix 309. The YUV data is filtered by the LPFs 310 to 312, converted to a video output signal (NTSC composite signal) by the NTSC encoder 313, and output.

  FIG. 21 to FIG. 23 show examples of color temperature correction and color balance correction circuits and operation examples for video signal output, and show an example of converting an image signal having a color temperature of 6500K (Kelvin) into 5000K. In the circuit diagram of FIG. 21, a luminance / color temperature measurement unit 400 includes an RGB luminance measurement 401, a color coordinate calculation unit 402, and a color temperature detection / color balance detection unit 403. The color temperature detection, color balance detection unit The color temperature 6500K detected by 403 is given to the color temperature correction / color balance correction unit 404. On the other hand, the gamma correction unit 405 generates R ′, G ′, and B ′ by performing gamma correction on R, G, and B of the image signal, and these R ′, G ′, and B ′ are RGB gain control units. 406, 407, and 408 are input.

  The color temperature correction / color balance correction unit 404 performs color temperature correction and color balance correction, converts the color temperature 6500K to 5000K, and gives the gain control units 406, 407, and 408 to each of them. Each gain control unit 406, 407, 408 controls R ′, G ′, B ′ gain based on the corrected color temperature 5000K, and outputs R ″, G ″, B ″. The output R ″, G ″, and B ″ are converted into Y, U, and V data by the color matrix 409, and the Y, U, and V data are filtered by the LPFs 410 to 412 and video by the NTSC encoder 413. It is converted into a signal (NTSC composite signal) and displayed as an image.

  That is, for example, the moving body intensity of the energy in the wavelength band for each color temperature of black body radiation is, as shown in FIG. 22A, energy in a band having a long wavelength (close to red), such as 2900K, at a low color temperature. Is strong and the energy in the short wavelength band (near purple and blue) becomes weak, so it looks reddish. Conversely, for light with a high color temperature of 9300K, the energy in the long wavelength band (near red) It is weak and has a short wavelength (near purple and blue), so it appears bluish.

  For example, as shown in FIG. 22B, the reference color temperature of the RGB signal of the color temperature corresponding to the detected color temperature (eg, 6500 K) from the RGB component relative intensity data corresponding to each chromaticity. (Example: 5000K) Relative intensities (eg, R = 0.76, G = 1.0, B = 1.14) were obtained, and the RGB color difference signals were converted to the white color shown in FIG. The balance control circuit adjusts the gain for each color difference signal so that the relative intensity is inversely proportional (for example, R × 1 / 0.76, G × 1/1, B × 1 / 1.14 times). Then, an RGB signal having a target reference color temperature (eg, 5000K) can be obtained.

  FIG. 23 is also an example of a color balance correction method. The chromaticity coordinates and (RY, BY) of each color sample detected from an image obtained by photographing a screen on which a color chart or the like is displayed. Etc.) Detect the deviation between the color difference data and the original chromaticity coordinates and color difference data of the color swatch, and adjust the screen balance to correct it based on the deviation (Cyan-Red axis, Magenta-Creen) Axis, Yellow-Blue axis, etc.) can be corrected by adjusting each color coordinate axis.

It is a block diagram which shows the system configuration | structure of the 1st Embodiment of this invention, and the circuit configuration of TV receiver. It is a block diagram which shows the circuit structure of a remote control transmitter. It is a block diagram which shows the circuit structure of a digital camera. It is a flowchart which shows operation | movement of the remote control transmitter in this Embodiment, a digital camera, and TV receiver. It is a flowchart which shows the process sequence of the detection and correction | amendment process of the brightness nonuniformity of a display panel. FIG. 6 is an operation transition diagram corresponding to the flowchart of FIG. 5. It is a figure which shows the structural example of the image of a test pattern or a color chart. It is a figure which shows the example of a time division switching of a test pattern. It is a block diagram which shows the 2nd Embodiment of this invention. It is a block diagram which shows the circuit structure of the digital camera in the embodiment. 3 is a flowchart showing an operation of the digital camera in the embodiment. It is a flowchart following FIG. It is a figure which shows the example of a setting of the gamma characteristic in a digital camera and monitor TV. It is explanatory drawing which shows the case where it reproduces | regenerates with the external monitor of a different gamma characteristic. It is a figure which shows the operation example at the time of imaging | photography and measuring the screen image with a digital camera of the external monitor. It is explanatory drawing which shows the case where it correct | amends and outputs the gamma of a video output according to the gamma of an external monitor. It is explanatory drawing which shows the case where gamma of a built-in monitor is match | combined with an external monitor instead of correcting video output. It is a figure which shows the method in the case of outputting the test pattern image comprised by the gray scale from the camera to the external monitor, and measuring. It is a figure which shows the example of the correction method by a digital process in the case of carrying out the correction process by the conversion process of luminance distribution data, and outputting the gamma characteristic and gradation characteristic of an image data signal. It is a figure which shows the structural example of the video signal of a digital camera part, or the gamma correction circuit of an internal LCD monitor, and a color temperature correction circuit. It is a figure which shows the circuit example of color temperature correction | amendment of a video signal output, and color balance correction | amendment. (A) is a figure which shows the spectral distribution characteristic example (relative intensity when each spectral intensity of 5000K is set to 1) of black body radiation, (b) is the relative intensity of RGB component for every color temperature, and color temperature. It is a figure which shows the example of correction | amendment (gain control by the reciprocal number of relative intensity). It is a figure which shows the process of measurement and correction | amendment of a color balance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 TV receiver 111 Display drive circuit 112 Display panel 113 X driver 114 Y driver 115 Control circuit 116 Correction data memory 117 Operation input part 118 Remote control decoder 119 Screen measurement part 120 Infrared light receiving sensor 121 Test pattern generation circuit 128 Video / audio input terminal 129 Video / audio input circuit 140 Remote control transmitter 150 Digital camera 151 Video output terminal 164 CPU
165 ROM
166 RAM
200 TV Receiver 211 Display Drive Circuit 212 Display Panel 213 X Driver 214 Y Driver 215 Control Circuit 217 Operation Input Unit 250 Digital Camera 251 Video Output Terminal 252 Built-in Monitor 253 CPU
254 Control circuit 255 Program memory 256 Data memory 267 Gray scale gradation measuring unit 268 Image sensor 269 CDS
270 AGC

Claims (9)

Imaging means for capturing a playback image of a playback device that plays back an image based on image data;
Detection means for detecting a state of an element related to the reproduction characteristics of the reproduction device based on the image picked up by the image pickup means;
Control means for controlling the characteristics of the image data output to the playback device based on the state of the elements related to the playback characteristics detected by the detection means;
An image pickup apparatus comprising: output means for outputting the image data whose characteristics are controlled by the control means to the reproduction apparatus. Display means for displaying an image captured by the imaging means;
Selecting means for selecting between the first mode and the second mode;
When the first mode is selected by the selection unit, the control unit determines whether the image data to be output to the reproduction device is based on the state of the element related to the reproduction characteristic detected by the detection unit. The characteristics are controlled, and the output means outputs the image data whose characteristics are controlled by the control means to the playback device,
When the second mode is selected. 2. The imaging apparatus according to claim 1, wherein the control unit controls the display characteristic of the display unit based on a state of an element related to the reproduction characteristic detected by the detection unit. Imaging means for capturing a playback image of a playback device that plays back an image based on image data;
Detection means for detecting a state of an element related to the reproduction characteristics of the reproduction device based on the image picked up by the image pickup means;
Display means for displaying an image captured by the imaging means;
Control means for controlling a display characteristic of the display means based on a state of an element related to the reproduction characteristic detected by the detection means;
An imaging apparatus comprising: The playback device further includes an adjustment image output means for outputting image data for characteristic adjustment,
4. The imaging apparatus according to claim 1, wherein the imaging unit captures the reproduced image in a state where the reproducing apparatus reproduces an image for characteristic adjustment based on the image data.   The imaging apparatus according to claim 1, wherein the imaging unit includes a correction unit that corrects an image captured from a different direction into an image from a substantially front direction.   46. The imaging apparatus according to claim 1, wherein the control unit controls at least one of luminance, gradation characteristics, color temperature, or color balance. The reproduction device is an image display device including a display unit that displays an image based on the image data, or a printer that prints an image based on the image data.
The imaging apparatus according to claim 1, wherein the imaging unit captures an image displayed on the display unit or an image printed by the printer. Capture a playback image of a playback device that plays back an image based on the image data,
Based on the captured image, the state of elements related to the reproduction characteristics of the reproduction device is detected,
Based on the detected state of the element related to the reproduction characteristics, control the characteristics of the image data output to the reproduction device,
An image reproduction method, characterized in that the image data whose characteristics are controlled is output to the reproduction apparatus. Capture a playback image of a playback device that plays back an image based on the image data,
Based on the captured image, the state of elements related to the reproduction characteristics of the reproduction device is detected,
An image reproduction method comprising: controlling display characteristics of a display means for displaying an image picked up by the image pickup means based on a state of an element related to the reproduction characteristics detected by the detection means.

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