JP4751638B2 - Color conversion apparatus and photographing apparatus - Google Patents

Description

  The present invention relates to a photographing apparatus such as a camera capable of displaying a moving image, and more particularly to image processing for removing a color recognition obstacle for a color blind person.

Those who are visually impaired, such as so-called color blindness and color weakness, who have impaired visual function with respect to color information, have difficulty in visually recognizing a specific color, and have impaired recognition of high-luminance subject images. Accordingly, it is difficult to recognize the display contents when a subject image having a large ratio of a specific color such as red or green or a high luminance is viewed on the screen. For this reason, an algorithm for performing color conversion processing on a digital color image has been proposed so that a color-blind person can recognize a color image in the same manner as a color-blind person (see Patent Document 1). There, the symptoms (types) of color blind persons are input in advance, and the coordinate position of the chromaticity based on the Yu ^* v ^* space is moved with respect to the recorded color image to convert it into a color that can be recognized by the color blind person. To do.
Japanese Patent Laid-Open No. 2004-266821

  In a portable device such as a digital camera, when displaying a subject image picked up for observation on the screen of a display device, since the algorithm calculation of the color conversion process is complicated, the color conversion process takes time, It is difficult to quickly display an image that has undergone color conversion processing, and it is difficult to incorporate the color conversion processing program into a portable device that is restricted in design specifications. In particular, when displaying moving images in real time, a simple and quick calculation processing system is required. Once color conversion processing is set, an image that is difficult to recognize by color conversion processing is displayed when a subject having a spectral reflection characteristic that does not need to be color-converted is captured.

  The photographing apparatus of the present invention is applied to a portable photographing apparatus such as a digital still camera, a movie camera, a camera-equipped mobile phone, or a camera-equipped personal digital assistant capable of displaying a subject image on a display device. In particular, it can be applied as a photographing apparatus capable of displaying a moving image in real time. The photographing apparatus includes a signal processing unit that generates a color image signal based on a pixel signal read from the image sensor, and a display unit that displays a subject image based on the color image signal. As the color image signal, for example, an R, G, B image signal or a luminance, color difference Y, Cr, Cb color image signal is generated.

  The photographing apparatus of the present invention includes color detection means for determining whether or not the color characteristic of the subject image is a recognition failure for a color blind person. People with color blindness have various symptoms, but the main symptoms are divided into color blindness and color weakness. When a person with color blindness is considered, the color detection means has a color component corresponding to at least one of the three cones (L cone, M cone, S cone) in the retina of the eye. What is necessary is just to judge whether it exceeds the predetermined ratio in the whole subject image. In the case of the first color blind, the color component of the red to yellow-green wavelength region corresponding to the L cone, and in the case of the second color blind, the color component of the green to yellow-green wavelength region corresponding to the L cone. In the case of color blindness, a determination may be made regarding the color component in the purple to blue wavelength region corresponding to the L cone. As a ratio, a predetermined ratio may be derived empirically from experiments on subjects, but for example, if the ratio exceeds half, it is determined that recognition of the subject image is difficult. When all colors are blind without two or more cones, the ratio may be determined separately for the color components of each cone, and color conversion may be performed if at least one of them exceeds a predetermined ratio.

  On the other hand, when the color is weak, it is sensitive to a change in brightness, so that recognition failure occurs when the number of high-luminance pixels increases in the entire subject image. Therefore, the color detection means may determine whether or not the ratio of high luminance in the entire subject image exceeds a predetermined ratio. The predetermined ratio here is also determined empirically, but is set to 60%, for example.

  The signal processing means performs color reversal processing on the color image signal so that it can be identified by the color blind person when the color characteristic of the subject image is a color characteristic that is a recognition obstacle. In the color reversal process, the color is shifted to a position that is in contrast to the spatial reference position and the reference axis in the color space, and moved to a position that can be recognized by each type of color blind person. Further, the color inversion processing here includes luminance inversion processing. With color inversion processing that can be realized with such a simple algorithm, color inversion processing is automatically executed based on real-time color information of the subject image, and in the case of an image with recognition failure, color inversion processing is performed. Otherwise, it is displayed as it is.

In order to cope with both color weakness, first and second color blind persons, and to quickly determine the color characteristics, the signal processing means may generate luminance and color difference signals as color image signals. The color detection means preferably determines the ratio of the color component based on the luminance signal and the color difference signal. The luminance signal is used for color-blind people and the color difference signal is used for color-blind people. At this time, the color detection means may determine the ratio of the color components according to the Yu ^* v ^* space. For example, the ratio of the color component corresponding to the L cone, M cone, and S cone in the subject image is obtained by the number of pixel distributions in a predetermined area corresponding to the color component in the Yu ^* v ^* color space.

  When a subject image that has undergone color reversal processing is displayed, the image to be recorded should also be a reversal image. For this reason, in a photographing apparatus including a recording unit that generates a recording color image signal based on a pixel signal read from the image sensor and records it as image data, the signal processing unit displays a subject image that has been color-reversed. In this case, color reversal processing is performed on the recording color image signal. Then, the color image signal subjected to the color inversion process is recorded.

  It is preferable that the user can set the color detection determination method according to the symptoms of his / her color blindness. For example, an operation member is provided for selecting and setting one of a luminance conversion mode for performing color reversal processing determination for the color-blind and a specific color conversion mode for performing color reversal processing determination for the color blind. Setting means for setting one of the conversion modes is provided according to the operation on the member. When the color conversion unit is set to the luminance conversion mode, the color detection unit determines whether the ratio of the high luminance in the entire subject image exceeds a predetermined rate. When the color conversion mode is set, the color detection unit It is determined whether or not the ratio of the color component corresponding to at least one of the three cones exceeds a predetermined ratio. As a result, the color reversal process is determined based only on the luminance information when used by the color weak person, and the color reversal process is determined based only on the color component when used by the color blind person. .

  The color conversion apparatus according to the present invention determines whether or not the color characteristic of the color image signal corresponding to the subject image is a recognition obstacle for the color blind person while being generated based on the pixel signal read from the image sensor. And a color reversal processing unit that performs color reversal processing on the color image signal so that the color detection unit can identify the color characteristic when the color characteristic is a recognition failure. .

  The color conversion method of the present invention determines whether or not the color characteristics of the color image signal generated based on the pixel signal read from the image sensor and corresponding to the subject image is a recognition obstacle for the color blind person. When the color characteristic is a recognition failure, color reversal processing is performed on the color image signal so that it can be identified by a color blind person.

  The program of the present invention is generated based on the pixel signal read from the image sensor, and color detection that determines whether the color characteristic of the color image signal corresponding to the subject image is a recognition obstacle for a color blind person And color reversal processing means for performing color reversal processing on the color image signal so that it can be identified by a color blind person when the color characteristic is a recognition failure.

  An imaging device of the present invention includes a signal processing unit that generates a color image signal based on a pixel signal read from an image sensor, a display unit that displays a subject image based on the color image signal, and a high level among all the subject images. Color detection means for determining whether or not the luminance ratio exceeds a predetermined ratio that causes recognition impairment, and when the signal processing means is a ratio that causes recognition impairment, so that a person with color blindness can identify. The color image signal is subjected to color inversion processing.

  The photographing apparatus according to the present invention includes a signal processing unit that generates a color image signal based on a pixel signal read from an image sensor, a display unit that displays a subject image based on the color image signal, and three of the entire subject image. Color detection means for determining whether the ratio of the color component corresponding to at least one of the two cones exceeds a predetermined ratio that is a recognition failure for a color blind person, and the signal processing means recognizes When the ratio is an obstacle, color reversal processing is performed on the color image signal so that it can be identified by a color blind person.

  As described above, according to the present invention, it is possible to quickly and automatically display an image that can be recognized by a color blind person.

  Hereinafter, a digital camera according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a digital camera.

  The digital camera 10 is a digital still camera that can display a moving image (through image) at the time of shooting. A system control circuit 50 including a CPU is a program that controls the digital camera 10 and executes processing operations of the entire camera. It is stored in a ROM (not shown). The release half-push switch 12, the mode switch 13, the release full-push switch 14, the execution switch 16, the EEPROM 40, and other circuits are connected to the system control circuit 50. When the power is turned on by operating the main button (not shown). The power is supplied to each circuit.

  The execution switch 16 and the setting switch 18 send signals to the system control circuit 50 in response to operations on an execution button and a cross button (both not shown) provided on the back of the camera 10, respectively. Based on the signals from the execution switch 16 and the setting switch 18, the mode is set. The release half-press switch 12 and the release full-press switch 14 detect half-press and full-press of a release button (not shown). In the mode switch 13, a signal is output to the system control circuit 50 in accordance with an operation on a mode button (not shown). Here, a shooting mode, a shooting setting mode, a playback mode, a color inversion mode, and the like are selected and set. The color conversion switch 20 detects an operation of a color conversion button (not shown) provided on the upper surface of the camera 10.

  In the state where the color inversion mode is set by the mode button, the luminance conversion mode, the red conversion mode, and the green conversion mode can be selected. The color inversion mode is a mode in which color conversion processing is performed so that a person with color blindness can recognize the same image information as that of a person with normal color vision. Brightness conversion mode for people with color weakness, color conversion disorder for the color component of the L cone (first color blindness), red conversion mode for the color blindness of the color component of the L cone (second color blindness) On the other hand, the green conversion mode can be set. When the color inversion mode is set, a screen for selecting and setting the luminance conversion mode, red conversion mode, and green conversion mode is displayed on the LCD 34.

  When the shooting mode is set, processing for displaying a moving image is executed. When the light passing through the photographing optical system 22 reaches the CCD 24, a subject image is formed on the CCD 24, and an analog image signal (pixel signal) corresponding to the subject image is generated by photoelectric conversion. Analog image signals are sequentially read out from the CCD 24 at predetermined time intervals by the CCD driver 23. Here, the charges accumulated in the CCD 24 are read out while being thinned out according to the number of pixels of the LCD 34 provided on the back of the camera. The analog image signal read from the CCD 24 is subjected to noise removal in the CDS circuit 26 and converted into R, G, and B digital signals in the A / D converter 28.

  In the signal processing circuit 30 in the system control circuit 50, various processes such as a white balance adjustment process and a gamma correction process are performed on the digital image signal. Then, color image signals of luminance and color differences Y, Cb, and Cr are generated by matrix conversion processing. The generated color image signals of luminance and color differences Y, Cb, and Cr are temporarily stored in the DRAM 30A and sent as image data to the LCD driver 32 in the system control 50. The LCD driver 32 drives the LCD 34 based on the image data. As a result, the subject image is displayed on the LCD 34 as a moving image. When a grayscale image is set in the shooting setting mode, the image signal values of the color differences Cb and Cr are set to 0, and the image is displayed by the color image signal based on the luminance signal Y.

  When the release button is half-pressed, the half-press is detected by the release half-press switch 12, and the brightness of the subject is detected based on the image signal read from the CCD 24. Is calculated. The focusing lens in the photographic optical system 22 is driven by the drive mechanism 36 for focus adjustment. Further, when the release button is fully pressed and the release full-press switch 14 is turned on, the photographing operation is executed. That is, when the lens shutter 21 in the photographic optical system 22 is driven by the drive mechanism 36 and a subject image is formed on the CCD 24, an image signal (pixel signal) for one frame is read out from the CCD 24 without being thinned out. The read image signal is processed by the CDS circuit 26, the A / D converter 28, and the signal processing circuit 30, and the color image signals of luminance, color differences Y, Cb, and Cr are temporarily stored in the DRAM 30A as image data. Is done. At the same time, the system control circuit 50 performs compression processing on the image data, and the compressed image data is stored in the memory card 39 via the I / F circuit 38.

  When the playback mode is set by operating the mode button, the compressed image data selected by the user is read from the DRAM 30A and subjected to thinning processing. The LCD driver 32 drives the LCD 34 based on the image data subjected to the thinning process, and as a result, the selected still image is displayed on the LCD 34.

  FIG. 2 is a flowchart showing the mode setting process in the color inversion mode. Triggered when the color inversion mode is set in the mode button.

  In step S101, it is determined whether or not the mode button has been switched to a mode other than the color inversion mode. If it is determined that the mode has been switched to a mode other than the color reversal mode, the processing ends. On the other hand, if it is determined that the color inversion mode is maintained, the process proceeds to step S102.

  In step S102, it is determined whether or not the luminance mode has been selected by operating the cross button. The brightness mode is a mode set for a person with weak color whose sensitivity curve is shifted among the three types of cones, and is displayed on the LCD 34 when the brightness of the subject image is high, that is, the screen display is too bright. By performing color reversal including luminance on the subject image, the image can be recognized even by people with weak colors. If it is determined in step S102 that the luminance mode has been selected, the process proceeds to step S103.

  In step S103, it is determined whether or not the execution button has been operated. If it is determined that the execution button is not operated, the process returns to step S102. On the other hand, if it is determined that the execution button has been operated, the process proceeds to step S104, and the luminance mode is set. When step S104 is executed, the mode setting process ends.

  On the other hand, if it is determined in step S102 that the luminance mode is not selected, the process proceeds to step S105. In step S105, it is determined whether or not the red conversion mode is selected by operating the cross button. The red conversion mode is a mode set for a visually handicapped person (first color blind person) who does not have an L cone corresponding to red. When the red to yellow-green component of the subject image increases, color inversion is performed on the subject image, and the subject image can be recognized even by the first color blind person.

  If it is determined in step S105 that the red conversion mode is selected, the process proceeds to step S106. In step S106, it is determined whether or not the execution button has been operated. If it is determined that the execution button is not operated, the process returns to step S105. On the other hand, if it is determined that the execution button has been operated, the process proceeds to step S107, and the red conversion mode is set. When step S107 is executed, the mode setting process ends.

  On the other hand, if it is determined in step S105 that the red conversion mode is not selected, the process proceeds to step S108. In step S108, it is determined whether or not the green conversion mode is selected by operating the cross button. The green conversion mode is a mode set for a visually handicapped person (second color blind person) who does not have an M cone corresponding to green. When the green to yellow-green component of the subject image increases, color inversion is performed on the subject image, and the subject image can be recognized even by a second color blind person.

  If it is determined in step S108 that the green conversion mode is not selected, the process returns to step S101. On the other hand, if it is determined in step S108 that the green conversion mode is selected, the process proceeds to step S109. In step S109, it is determined whether or not the execution button has been operated. If it is determined that the execution button has not been operated, the process returns to step S108. On the other hand, if it is determined that the execution button has been operated, the process proceeds to step S110, and the green conversion mode is set. When step S110 is executed, the mode setting process ends.

3 and 4 are flowcharts showing the photographing operation process. FIG. 5 is a diagram showing a pixel distribution in the red conversion mode in the Yu ^* v ^* color space. FIG. 6 is a diagram showing a pixel distribution in the green conversion mode in the Yu ^* v ^* color space. When the shooting mode is set, the shooting operation process is started.

In step S201, color image signals of luminance and color differences Y, Cr, and Cb generated based on the R, G, and B digital image signals are extracted. The luminance, color difference Y, Cr, and Cb color image signals are generated based on the following equations.

Y = 0.2999R + 0.587G + 0.114B
Cr = 0.169R-0.331G-0.500B
Cb = 0.500R-0.419G-0.081B
(1)

When step S201 is executed, the process proceeds to step S202.

  In step S202, it is determined whether or not the color reversal mode is set for the color blind person. If it is determined that the color inversion mode is not set, the process proceeds to step S217. On the other hand, if it is determined that the color inversion mode is set, the process proceeds to step S203, where it is determined whether the luminance conversion mode is set.

If it is determined in step S203 that the luminance conversion mode has been set, the process proceeds to step S204, where it is determined whether the following expression regarding the luminance is satisfied, that is, whether color inversion processing is necessary.

NYs ≧ 0.6NT (2)

Here, NYs indicates the number of pixels having a luminance value exceeding 180 with respect to the subject image constituted by the color image signal, and NT indicates the number of pixels of the entire subject image. The value of the luminance Y is expressed in 256 levels and is set to any value from 0 to 255.

If it is determined in step S204 that the expression (2) is satisfied, the process proceeds to step S205, and color inversion processing is executed. The color inversion process is executed according to the following equation.

(Y ′, Cr ′, Cb ′) = (255−Y, −Cr, −Cb) (3)

In step S206, the flag F is set to 1. The flag F is a variable that is set to switch execution / non-execution of color inversion processing during image recording.

  On the other hand, if it is determined in step S204 that the expression (2) is not satisfied, the process proceeds to step S207, and the flag F is set to 0. When step S206 or step S207 is executed, the process proceeds to step S217.

On the other hand, if it is determined in step S203 that the luminance conversion mode is not set, the process proceeds to step S208, and it is determined whether or not the red conversion mode is set. If it is determined that the red conversion mode is set, the process proceeds to step S209, where the ratio of red to yellow-green pixels corresponding to the L cone in the subject image satisfies the following expression, that is, color inversion processing is required. It is determined whether or not.

NYr / NT> 0.5 (4)

Here, NYr indicates the number of pixels having chromaticity in the area A shown in FIG. 5 with respect to the subject image constituted by the color image signal, and NT indicates the number of pixels of the entire subject image.

FIG. 5 shows a Yu ^* v ^* color space (x, y) (= (Cr / Y, Cb / Y)), and the color distribution is defined by a two-dimensional coordinate system. However, the value of (x, y) is not represented by the value of equation (1) but is expressed in 256 gradations, and is set to any value of −128 <(x, y) <128. In the Yu ^* v ^* color space, the area A corresponding to the red to yellow-green components is in the second quadrant, and the area A is defined by the following expression.

y> −x (y> 0) (5)

Here, it is determined whether or not the ratio of the number of pixels in the area A in the subject image exceeds half.

If it is determined in step S209 that the subject image does not satisfy the expression (4), that is, the ratio of pixels having the color in the area A is less than half of the whole, the process proceeds to step S212, and the flag F is set to 0. Is done. On the other hand, if it is determined in step S209 that the expression (4) is satisfied, that is, the ratio of pixels having colors in the region A exceeds half, the process proceeds to step S210, and the color inversion process is performed based on the expression (3). Executed. When the color inversion process is executed, the chromaticity (x, y) of the Yu ^* v ^* color space moves to a position that is in contrast to the origin of the color space. In step S211, the flag F is set to 1. When step S211 or step S212 is executed, the process proceeds to step S217.

On the other hand, if it is determined in step S208 that the red conversion mode is not set, the process proceeds to step S213. In step S213, it is determined whether or not the ratio of the green to yellow-green pixels corresponding to the M cone in the subject image satisfies the following expression.

0.7> RYr / NT> 0.5 (6)

Here, RYr indicates the number of pixels having a color in the region B shown in FIG. 6 with respect to the subject image constituted by the color image signal, and NT indicates the number of pixels of the entire subject image.

FIG. 6 also shows the Yu ^* v ^* color space (x, y), showing the distribution of color image signals. In the Yu ^* v ^* color space, the region B corresponding to green to yellow-green is in the fourth quadrant, and the region B is defined by the following equation:

x <-40
y <−40
(7)

Here, it is determined whether or not the ratio of the pixels in the region B in the subject image is in the range of 50% to 70%. The reason why the upper limit is set is that the case where plants are photographed is taken into consideration.

  If it is determined in step S213 that the expression (6) is not satisfied, the process proceeds to step S216, and the flag F is set to 0. On the other hand, if it is determined in step S213 that the expression (6) is satisfied, the process proceeds to step S214, and the color inversion process is executed based on the expression (3). In step S215, the flag F is set to 0. When step S215 or step S216 is executed, the process proceeds to step S217.

  In step S217, the moving image that has undergone color reversal processing or the moving image that has not undergone color reversal processing is displayed on the LCD 34. In step S218, it is determined whether or not the release button is half-pressed and the release half-press switch 12 is in the ON state. If it is determined that the release half-press switch 12 is not in the ON state, that is, it is not half-pressed, the process returns to step S201. On the other hand, if it is determined that the release half-press switch 12 is in the ON state, the process proceeds to step S219.

  In step S219, the brightness of the subject is detected, and the exposure value is calculated. At the same time, focus adjustment is performed. In step S220, it is determined whether or not the release button is fully pressed and the release full-press switch is in the ON state. If it is determined that the release full-press switch 14 is not in the ON state, the process returns to step S217. On the other hand, if it is determined that the release full-press switch 14 is in the ON state, the process proceeds to step S221 in FIG.

  In step S221, exposure control is performed. That is, the shutter and diaphragm are driven according to the calculated exposure values, and an image signal for one frame is read from the CCD 24. Then, based on the read image signal, color image signals of luminance and color differences Y, Cb, and Cr are generated.

  In step S222, it is determined whether or not the flag F is set to 1. If it is determined that the flag F is set to 1, the process proceeds to step S223, and color inversion processing is performed on the recorded color image signal. When step S223 is executed, the process proceeds to step S224. On the other hand, if it is determined that the flag F is set to 0, the process proceeds to step S224 as it is.

  In step S224, the color image signal that is image data is compressed, and in step S225, the image data is recorded on the memory card 39. In step S226, the flag F is reset to 0. When step S226 is executed, the shooting operation process ends.

  As described above, according to this embodiment, color image signals of luminance and color differences Y, Cr, and Cb are generated, and a subject image is displayed as a moving image on the LCD 34 based on the color image signals. When any one of the luminance conversion mode, the red conversion mode, and the green conversion mode is set, it is determined whether the color characteristic of the subject image obtained by photographing is a recognition failure for the color blind person. If it is determined that a recognition failure has occurred, color inversion processing including luminance inversion is performed.

  Regarding the determination of color reversal processing execution, based on the above formula, assuming that a user shoots a sheet document such as a general white document or a leaflet and uses it for visual recognition (so-called text shooting mode). Although it is configured to perform execution / non-execution of color reversal, of course, the determination may be made based on a formula other than the above formula. For example, in the case of luminance, determination may be made based on whether it exceeds 50%, or any ratio of 50% to 80% may be used as a reference. In the case of a reddish color component corresponding to the L cone, determination may be made based on whether or not it exceeds 30%, or any ratio of 30% to 50% may be used as a reference. In the case of the color component corresponding to the green region corresponding to the M cone, the upper limit need not be provided.

Color determination may be performed using a color space other than the Yu ^* v ^* color space, and based on image signals of color components other than luminance, color differences Y, Cb, and Cr, such as R, G, and B color image signals. The color may be discriminated.

  Color discrimination is performed for each symptom (type) of people with color blindness, but for people with all color blindness, color discrimination for luminance, red component, and green component is performed at the same time for color vision recognition. A color reversal process may be performed when it is determined that there is a failure. In addition, after the color reversal processing is performed once, the subject image subjected to the color reversal processing may be continuously displayed. In this case, step S218 is configured to return to step S217.

  In this embodiment, at the time of color reversal processing, the luminance and color differences Y, Cr, and Cb are all color-reversed. However, for people with weak colors, color reversal processing may be performed so that only the luminance is reversed. Alternatively, for the first color blind, second color blind, or all color blind, it may be configured such that the color is inverted only by the luminance and color differences Y, Cr, and Cb. In addition, the color conversion processing may be executed for a recording moving image or a still image without being limited to a real-time moving image.

It is a block diagram of a digital camera. It is the flowchart which showed the mode setting process in color inversion mode. It is the flowchart which showed photographing operation processing. It is the flowchart which showed photographing operation processing. It is the figure which showed the pixel distribution in red conversion mode in Yu ^* v ^* color space. It is the figure which showed the pixel distribution in the green conversion mode in Yu ^* v ^* color space.

Explanation of symbols

10 Digital camera 24 CCD (Image sensor)
30 Signal processing circuit 34 LCD
50 System control circuit

Claims (17)

Signal processing means for generating a color image signal based on a pixel signal read from the image sensor;
Display means for displaying a subject image based on the color image signal;
Color detection means for determining whether or not the ratio of high luminance in the entire subject image exceeds a predetermined ratio that is a recognition failure for a color blind person ;
An image-taking apparatus that performs color reversal processing on a color image signal so that the signal processing means is capable of being recognized by a color blind person when the ratio is a recognition failure. A recording unit that generates a recording color image signal based on the pixel signal read from the image sensor and records it as image data;
The photographing apparatus according to claim 1, wherein when the signal processing unit displays a subject image that has been color-reversed, a color reversal process is performed on the recording color image signal . Signal processing means for generating a color image signal based on a pixel signal read from the image sensor;
Display means for displaying a subject image based on the color image signal;
Color detecting means for determining whether or not the ratio of the color component corresponding to at least one of the three cones in the entire subject image exceeds a predetermined ratio that causes a cognitive impairment for a color blind person ; Prepared,
An image- taking apparatus that performs color reversal processing on a color image signal so that the signal processing means is capable of being recognized by a color blind person when the ratio is a recognition failure.   The photographing apparatus according to claim 3, wherein the color detection unit determines whether or not a ratio of a color component corresponding to the L cone in the entire subject image exceeds a predetermined ratio.   The photographing apparatus according to claim 3, wherein the color detection unit determines whether or not a ratio of color components corresponding to the M cone in the entire subject image exceeds a predetermined ratio. The signal processing means generates luminance and color difference signals as color image signals,
The photographing apparatus according to claim 3, wherein the color detection unit determines a ratio of color components based on a color difference signal. The photographing apparatus according to claim 6, wherein the color detection unit determines a ratio of color components according to a Yu ^* v ^* color space. A recording unit that generates a recording color image signal based on the pixel signal read from the image sensor and records it as image data;
4. The photographing apparatus according to claim 3 , wherein when the signal processing means displays a subject image that has been color-reversed, a color reversal process is performed on the recording color image signal. An operation member for selecting and setting any one of a luminance conversion mode for executing a color reversal process determination for a color weak person and a specific color conversion mode for executing a color reversal process determination for a color blind person;
Setting means for setting any conversion mode according to the operation on the operation member;
The color detection means;
When the brightness conversion mode is set, it is determined whether the ratio of high brightness in the entire subject image exceeds a predetermined ratio,
When the color conversion mode is set, it is determined whether or not the ratio of the color component corresponding to at least one of the three cones in the entire subject image exceeds a predetermined ratio. The imaging device according to claim 1. The ratio of high luminance in the entire subject image exceeds a predetermined rate that causes a recognition failure for a color blind person with respect to a color image signal corresponding to the subject image that is generated based on a pixel signal read from the image sensor . Color detection means for determining whether or not,
A color conversion device comprising: color reversal processing means for performing color reversal processing on a color image signal so that it can be identified by a color blind person when the ratio is a recognition failure. To the color image signal corresponding to the Utsushitai image together Once generated based on the pixel signals read from the image sensor, a predetermined percentage of the proportion of high-brightness is recognized obstacle to color vision disabilities in the entire object image To determine whether or not
A color conversion method, wherein color reversal processing is performed on a color image signal so that the color image signal can be identified by a person with color blindness when the ratio is a recognition failure rate . Shooting device
To the color image signal corresponding to the Utsushitai image together Once generated based on the pixel signals read from the image sensor, a predetermined percentage of the proportion of high-brightness is recognized obstacle to color vision disabilities in the entire object image a color detection means for determining whether or not exceeded,
Color reversal processing means for performing color reversal processing on a color image signal so that it can be identified by a person with color blindness when the ratio is a recognition failure
Program characterized thereby to function. 2. The signal processing unit according to claim 1, wherein the signal processing unit generates luminance and color difference signals as color image signals, and performs color reversal processing on both the luminance and color difference signals when the ratio is a recognition failure. Shooting device. The photographing apparatus according to claim 1, wherein the signal processing unit generates a luminance and color difference signal as a color image signal, and performs color reversal processing only on the luminance signal when the ratio is a recognition failure. . The ratio of the color component corresponding to at least one of the three cones in the entire subject image with respect to the color image signal generated based on the pixel signal read from the image sensor and corresponding to the subject image. Color detection means for determining whether or not a predetermined ratio that is a cognitive impairment for color blind persons is exceeded;
A color conversion device comprising: color reversal processing means for performing color reversal processing on a color image signal so that it can be identified by a color blind person when the ratio is a recognition failure. The ratio of the color component corresponding to at least one of the three cones in the entire subject image with respect to the color image signal generated based on the pixel signal read from the image sensor and corresponding to the subject image. Determine whether it exceeds a certain percentage that causes cognitive impairment for color blind people,
A color conversion method, wherein color reversal processing is performed on a color image signal so that the color image signal can be identified by a person with color blindness when the ratio is a recognition failure rate. Shooting device
The ratio of the color component corresponding to at least one of the three cones in the entire subject image with respect to the color image signal generated based on the pixel signal read from the image sensor and corresponding to the subject image. Color detection means for determining whether or not a predetermined ratio that is a cognitive impairment for color blind persons is exceeded;
A program that functions as a color reversal processing unit that performs color reversal processing on a color image signal so that it can be identified by a person with color blindness when the ratio is a recognition failure.

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