JP6849351B2 - Image processing equipment, image processing methods, and programs - Google Patents

Description

The present invention relates to an image processing apparatus, an image processing method, and a program for processing an image signal.

Conventionally, in an image pickup device, an image pickup device that captures a subject image and outputs an image pickup signal saturates the output signal from the pixels when strong light of a certain level or more is incident on the pixels constituting the element. Of the images captured by the image sensor, the saturated pixel region is recognized as a so-called overexposed region. In particular, when a person is imaged, if the light reflected on the surface of the skin causes overexposure, so-called "shininess" is generated on a part of the skin, which often gives an unpleasant impression to the viewer. .. Further, in an image sensor in which each pixel outputs only specific color signals of R (red), G (green), and B (blue) like a so-called Bayer arrangement, all the color signals are not saturated and a specific color signal is output. Coloring phenomenon may occur in which the color balance is lost due to saturation.

Therefore, for example, Patent Document 1 discloses a technique for correcting the shine of a part of the skin. In the technique described in Patent Document 1, an image area (subject area) of a specific subject (person, etc.) is detected from the image, and the detected subject area is close to the main color component (skin color, etc.) of the subject, that is, Detects the skin color area. Then, when the brightness value is high with reference to the brightness value of the skin color region, the correction is made so as to lower the brightness. Further, Patent Document 2 discloses a technique for reducing a coloring phenomenon by performing a color suppression process using a gain suppression characteristic in which a gain decreases when the luminance signal of an image exceeds a certain value.

Japanese Unexamined Patent Publication No. 2005-327007 Japanese Unexamined Patent Publication No. 8-331584

However, in the case of the technique described in Patent Document 1, the coloring phenomenon is not taken into consideration, and in the region where only a specific color signal is saturated, the influence of the coloring phenomenon occurs even when the correction is performed so as to lower the brightness. .. Further, in the color suppression process described in Patent Document 2, since the case where the correction is made so as to lower the luminance value when the luminance value is high is not taken into consideration, shine may occur.

Therefore, an object of the present invention is to reduce the brightness value in a high-luminance region such as shine that occurs when a subject such as a person is photographed, and to obtain an image in which the coloring phenomenon is reduced.

The image processing apparatus of the present invention includes a generation means for generating a correction signal for correcting a high-brightness region of a predetermined subject from an input image, a suppression processing means for suppressing a color signal according to a signal level of the input image, and a suppression processing means. the image signal the color signal is suppressed by the suppression processing means, have a, a correction means for performing correction based on the correction signal, the suppression processing means, depending on whether the image area of the predetermined object It is characterized by adjusting the characteristic of suppressing a color signal.

According to the present invention, when a subject such as a person is photographed, the brightness value in the high-luminance region such as shine can be reduced, and an image in which the coloring phenomenon is reduced can be obtained.

It is a block diagram which shows the schematic structure example of the digital camera of this embodiment. It is a block diagram which shows the schematic structure example of the image processing part. It is a flowchart which shows the flow of processing in an image processing part. It is a figure which shows an example of the characteristic of a luminance signal and a luminance gain. It is a figure which shows an example of the characteristic of a luminance signal and a color suppression gain.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The image processing device of the present embodiment can be applied to a digital camera, a digital video camera, various mobile terminals such as a smartphone and a tablet terminal having a camera function, an industrial camera, an in-vehicle camera, a medical camera, and the like. In the present embodiment, a digital camera will be described as an example of application of the image processing device. The digital camera of the present embodiment has a function of correcting a high-luminance region generated by reflection of light emitted from a light source, for example, on the surface of a subject in the captured image.

FIG. 1 is a block diagram showing a schematic configuration example of the digital camera 100 of the present embodiment.
In FIG. 1, the lens group 101 includes a zoom lens and a focus lens. The shutter unit 102 has an aperture and a shutter. The imaging unit 103 includes a CCD, a CMOS element, or the like that converts an optical image imaged on the imaging surface by the lens group 101 into an electric signal (analog image signal). The imaging unit 103 also includes red (R), green (G), and blue (B) color filters corresponding to the so-called Bayer arrangement. The A / D conversion unit 104 converts the analog image signal output from the image pickup unit 103 into a digital image signal (hereinafter, referred to as image data). The image processing unit 105 performs various image processing such as white balance processing, gamma (γ) processing, contour enhancement, and color correction processing on the image data output from the A / D conversion unit 104. The memory control unit 107 controls writing and reading of image data to the image memory 106. The D / A conversion unit 108 converts the input image data into an analog image signal. The display unit 109 is composed of, for example, a liquid crystal display (LCD), and displays an image or the like on the screen of the liquid crystal display (LCD). The codec unit 110 compresses and encodes the image data, and decompresses and decodes the compressed and encoded data. The I / F unit 111 is an interface unit with the recording medium 112. The recording medium 112 is made of a memory card, a hard disk, or the like, and is removable from the digital camera 100. The face detection unit 113 detects, for example, an image region (subject region) in which a face appears as a predetermined subject from the captured image. The system control unit 114 controls the entire system of the digital camera 100. The operation unit 115 is a user interface unit for inputting various operation instructions from the user. The non-volatile memory 116 includes EEPROM and the like, and stores programs, parameters, and the like according to the present embodiment. The system memory 117 is a memory for expanding constants, variables, programs read from the non-volatile memory 116, etc. for the operation of the system control unit 114.

Hereinafter, a flow of basic processing at the time of subject imaging in the digital camera 100 of the present embodiment shown in FIG. 1 will be described.
The image pickup unit 103 photoelectrically converts the light incident through the lens group 101 and the shutter unit 102, and outputs the light as an analog image signal to the A / D conversion unit 104. The A / D conversion unit 104 converts the analog image signal sent from the image pickup unit 103 into digital image data and outputs the analog image signal to the image processing unit 105 and the memory control unit 107.

The image data supplied from the A / D conversion unit 104 or the image data supplied from the memory control unit 107 is supplied to the image processing unit 105 as the image data of the input image. The image processing unit 105 performs color conversion processing such as white balance, gamma processing, contour enhancement processing, and the like on the input image data. In the case of the present embodiment, the image processing unit 105 also performs correction processing (shininess correction processing) in a high-luminance region, which will be described later. A detailed description of the image processing unit 105 will be described later.

Further, the image processing unit 105 uses the information of the face detection result by the face detection unit 113 (information indicating the image area of the face in the input image) and the image data obtained by imaging to perform a predetermined evaluation value calculation process. I do. The information of the evaluation value calculation result is sent to the system control unit 114. Based on the information of the evaluation value calculation result, the system control unit 114 performs exposure control for adjusting the exposure to a subject such as a face, distance measurement control for focusing, and the like. Specifically, the system control unit 114 performs so-called TTL (through-the-lens) AF (autofocus) processing, AE (autoexposure) processing, AWB (auto white balance) processing, and the like. Various known techniques can be used for the evaluation values and their calculation processes used when performing exposure control, distance measurement control, etc., and their description and illustration are omitted here.

The image data output from the image processing unit 105 is written to the image memory 106 via the memory control unit 107. The image memory 106 stores image data captured by the imaging unit 103 and output from the A / D conversion unit 104, image data after image processing by the image processing unit 105, image data to be displayed on the display unit 109, and the like. Store.

The D / A conversion unit 108 converts the image display data stored in the image memory 106 into an analog signal and supplies it to the display unit 109. The display unit 109 displays an image or the like corresponding to the analog signal from the D / A conversion unit 108 on a display such as an LCD.

The codec unit 110 compresses and encodes the image data recorded in the image memory 106 based on standards such as so-called JPEG and MPEG. The system control unit 114 causes the recording medium 112 to record the image data encoded by the codec unit 110 via the I / F unit 111.

The above is the basic operation of the digital camera 100 of the present embodiment when shooting a subject. In addition to the basic operation described above, the system control unit 114 realizes each process of the present embodiment described later by executing the program stored in the non-volatile memory 116 described above. The program referred to here is a program for executing the processing of each flowchart described later in this embodiment. At this time, constants and variables for operation of the system control unit 114, programs read from the non-volatile memory 116, and the like are expanded in the system memory 117.

Hereinafter, the details of the image processing unit 105 will be described with reference to FIG. FIG. 2 is a block diagram showing a schematic configuration of the image processing unit 105.
In FIG. 2, the image processing unit 105 includes a simultaneous processing unit 200, a WB processing unit 201, a luminance color difference signal conversion unit 202, a shine correction signal generation unit 203 (hereinafter referred to as a correction signal generation unit 203), and color suppression. It has a processing unit 204. Further, the image processing unit 105 also includes a contour enhancement processing unit 205, an RGB signal conversion unit 206, a shine correction unit 207, a gamma processing unit 208, and a luminance color difference signal conversion unit 209.

The operation of each part of the image processing unit 105 shown in FIG. 2 and the processing flow in the image processing unit 105 will be described with reference to the flowchart of FIG.
In step S301 of FIG. 3, the image data input to the image processing unit 105 is input to the simultaneous processing unit 200. Then, in step S301, the simultaneous processing unit 200 performs simultaneous processing on the RGB input image data corresponding to the Bayer array. Each of the R, G, and B color signals (hereinafter, referred to as R, G, and B signals) generated by the simultaneous processing unit in the simultaneous processing unit 200 is sent to the WB processing unit 201. After step S301, the processing of the image processing unit 105 proceeds to step S302.

In step S302, the WB processing unit 201 applies a gain to the R, G, B signals sent from the simultaneous processing unit 200 based on the white balance gain value calculated by the system control unit 114, and white balances the white balance. Perform adjustment processing. The R, G, and B signals whose white balance has been adjusted by the WB processing unit 201 are sent to the luminance color difference signal conversion unit 202 and the correction signal generation unit 203, respectively. After step S302, the processing of the image processing unit 105 proceeds to step S303.

In step S303, the luminance color difference signal conversion unit 202 converts the R, G, B signals after the white balance adjustment into the luminance signal Y and the luminance signals RY, BY. The luminance signal Y converted by the luminance color difference signal conversion unit 202 is sent to the correction signal generation unit 203, the color suppression processing unit 204, and the contour enhancement processing unit 205, respectively, and the color difference signals RY and BY are color suppression. It is sent to the processing unit 204. After step S303, the processing of the image processing unit 105 proceeds to step S304.

In step S304, the correction signal generation unit 203 extracts a high-luminance region in the image region of the subject's face (hereinafter, referred to as a face region) from the supplied luminance signal Y. Then, the correction signal generation unit 203 performs a process of generating a shine correction signal used when correcting the high-luminance region (a shine correction signal generation process). Specifically, the correction signal generation unit 203 has a color signal ratio based on the characteristics of the face area from the R, G, B signals of each pixel in the face area to the face area detected by the face detection unit 113. Is determined, and a shine correction signal is generated based on the color signal ratio.

More specifically, the correction signal generation unit 203 first calculates the complementary color signal of the skin color from the R, G, and B signals of each pixel in the face region. For example, assuming that the average values of the R, G, and B signals in the face region are AveR, AveG, and AveB, and the R, G, and B signals are in the range of 0 to 255, respectively, the complementary color signals Rs of the skin color, Gs and Bs can be obtained by the equation (1). The average values AveR, AveG, and AveB of the R, G, and B signals in the face region represent the color signal ratio based on the characteristics of the face region.

Rs = 255-AveR
Gs = 255-AveG formula (1)
Bs = 255-AveB

Further, the correction signal generation unit 203 refers to the luminance signal Y, and the luminance gain for extracting the high luminance region from the face region according to the signal level of the luminance signal Y (hereinafter, referred to as the luminance level). Find the signal Ky. Then, the correction signal generation unit 203 calculates the shine correction signals Rh, Gh, Bh by multiplying the luminance gain signal Ky by the skin color complementary color signals Rs, Gs, Bs as in the equation (2).

Rh = Ky × Rs
Gh = Ky × Gs equation (2)
Bh = Ky × Bs

Here, FIG. 4 is a diagram showing an example of a conversion table when the correction signal generation unit 203 obtains the luminance gain signal Ky from the luminance signal Y. In FIG. 4, the horizontal axis represents the luminance signal Y and the vertical axis represents the luminance gain signal Ky. By using the conversion table shown in FIG. 4, when the luminance signal Y is smaller than the predetermined threshold value Th0 and it can be considered that no shine is generated, the correction signal generation unit 203 sets the luminance gain signal Ky to "0. Get a value of 0 ". In this case, the shine correction signals Rh, Gh, and Bh are each set to "0", and the shine correction process is not performed by the shine correction unit 207 in the subsequent stage. On the other hand, when the luminance signal Y is larger than the predetermined threshold value Th1 (Th1> Th0) and the subject is overexposed due to shine, the correction signal generation unit 203 sets the luminance gain signal Ky to "1.0". To get. In this case, the shine correction signals Rh, Gh, and Bh are signals corresponding to the complementary color signals Rs, Gs, and Bs of the skin color, respectively, and the shine correction unit 207 in the subsequent stage corrects the shine according to the complementary color signals Rs, Gs, and Bs of the skin color. Processing will be performed. Further, in the correction signal generation unit 203, when the luminance signal Y is between the threshold values Th0 and Th1, and the luminance level is not overexposed but the shine of the skin is conspicuous, "0" corresponding to the luminance level. A value between 0.0 "and" 1.0 "is obtained as the luminance gain signal Ky. In this case, the shine correction signals Rh, Gh, Bh are signals obtained by multiplying the skin color complementary color signals Rs, Gs, Bs by the luminance gain signal Ky, and the shine correction unit 207 in the subsequent stage performs shine correction according to the multiplication signal. Processing will be performed.

In this way, the correction signal generation unit 203 generates the luminance gain signal Ky from the luminance signal Y, and multiplies the luminance gain signal Ky by the skin color complementary color signals Rs, Gs, Bs to obtain the shine correction signals Rh, Gh. , Bh is calculated. That is, the shine correction signals Rh, Gh, and Bh are signals calculated for the high-luminance region in the face region where the shine correction processing needs to be performed. In other words, the high-luminance region that needs to be subjected to the shine correction processing is a region extracted from the face region according to the brightness level. Therefore, it can be said that the shine correction signals Rh, Gh, and Bh calculated by using the brightness gain signal Ky corresponding to the brightness level are signals suitable for the shine correction processing in the high brightness region. That is, the correction signal generation unit 203 can generate the shine correction signals Rh, Gh, and Bh in which the region where the shine needs to be corrected and the region where the shine does not need to be corrected are switched with a natural impression. The shiny correction signals Rh, Gh, and Bh generated by the correction signal generation unit 203 are sent to the shiny correction unit 207. After step S304, the processing of the image processing unit 105 proceeds to step S305.

In step S305, the color suppression processing unit 204 performs color suppression processing on the color difference signals RY and BY converted by the luminance color difference signal conversion unit 202. Specifically, the color suppression processing unit 204 calculates the color suppression gain based on the luminance signal Y converted by the luminance color difference signal conversion unit 202, and the calculated color suppression gain is used as the input color difference signal R-. By multiplying Y and BY, a color difference signal subjected to color suppression processing is generated. For example, assuming that the color suppression gain is CSUP_GAIN, the color difference signals RY'and BY'that have undergone the color suppression processing can be obtained as in Eq.

RY'= CSUP_GAIN x RY
B-Y'= CSUP_GAIN x B-Y formula (3)

Here, FIG. 5 is a diagram showing an example of a conversion table when the color suppression processing unit 204 obtains the color suppression gain CSUP_GAIN from the luminance signal Y. In FIG. 5, the horizontal axis represents the luminance signal Y, and the vertical axis represents the color suppression gain CSUP_GAIN. When the luminance signal Y is smaller than the predetermined threshold value Th3 and it can be considered that the coloring phenomenon due to the saturation of any of the R, G, and B signals does not occur, the color suppression processing unit 204 sets the color suppression gain CSUP_GAIN to "1. Get .0 ". Therefore, the color suppression processing unit 204 does not perform the color suppression processing. On the other hand, the color suppression processing unit 204 can determine that the luminance signal Y is larger than the predetermined threshold value Th4 (Th4> Th3) and the coloring phenomenon occurs due to the saturation of any of the R, G, and B signals. Obtains "0.0" as the color suppression gain CSUP_GAIN. In this case, the color suppression processing unit 204 performs the color suppression processing, and the occurrence of the coloring phenomenon is suppressed. Further, in the color suppression processing unit 204, when the luminance signal Y is between the threshold values Th3 and Th4 and there is a possibility that a coloring phenomenon occurs, "1.0" to "" according to the intensity of the luminance signal Y. A value between 0.0 "is defined as a color suppression gain CSUP_GAIN. In this case, the color suppression processing unit 204 performs color suppression processing in which the color suppression gain CSUP_GAIN is multiplied by the color difference signals RY and BY. However, since the color suppression gain CSUP_GAIN at this time is a value between "1.0" and "0.0" according to the intensity of the luminance signal Y, it is suppressed to be inconspicuous even if a coloring phenomenon occurs. Will be. As described above, the color suppression processing unit 204 can reduce the coloring phenomenon by generating the color suppression gain CSUP_GAIN with reference to the luminance signal Y and performing the color suppression processing.

At this time, the color suppression processing unit 204 may determine the threshold value for calculating the color suppression gain CSUP_GAIN by referring to the threshold values Th0 and Th1 when the correction signal generation unit 203 extracts the high-luminance region. .. For example, the color suppression processing unit 204 sets the threshold Th4 when obtaining the color suppression gain CSUP_GAIN to be smaller than the threshold Th1 when extracting the high-luminance region, so that the influence of the coloring phenomenon in the high-luminance region where the shine correction is performed. Will be able to be ignored.

Further, for example, when the color suppression processing unit 204 obtains the color suppression gain CSUP_GAIN depending on whether or not the subject area is the face area detected by the face detection unit 113, that is, whether or not the subject area should be the target of the shine correction. The threshold value Th3 and the threshold value Th4 may be adjusted. For example, when the subject area is not the face area detected by the face detection unit 113 (the area is not the target of the shine correction), the threshold values Th3 and Th4 when obtaining the color suppression gain CSUP_GAIN are set to higher values, for example. Adjust to. In this case, when the luminance signal Y is a lower value, the color suppression gain CSUP_GAIN is set to "1.0", and the color suppression processing by the color suppression processing unit 204 is not performed. As a result, it is possible to prevent the color suppression process from being performed on the region that is not the target of the shine correction and the saturation from being lowered more than necessary. In this way, the color suppression processing unit 204 adjusts the characteristics of the color suppression processing by changing the threshold value of the color suppression processing according to whether or not the region should be the target of the shine correction, so that the region is not the target of the shine correction. It is possible to prevent excessive color suppression processing from being performed.

Similarly, the color suppression processing unit 204 refers to the average values AveR, AveG, and AveB of the R, G, and B signals in the face region calculated by the correction signal generation unit 203, and determines whether the color is close to the skin color. The threshold values Th3 and Th4 when calculating the color suppression gain CSUP_GAIN may be adjusted. For example, for a region that is not skin-colored even within the face region detected by the face detection unit 113, the threshold values Th3 and Th4 when obtaining the color suppression gain CSUP_GAIN are adjusted to, for example, higher values. As a result, it is possible to prevent the color suppression treatment from being performed on a region other than the skin color even within the facial region, resulting in an unnecessarily low saturation. In this way, the color suppression processing unit 204 determines the characteristics of the color suppression processing according to the average values of the R, G, and B signals in the face region, AveR, AveG, and AveB, that is, the color signal ratio used when generating the shine correction signal. By adjusting, it is possible to prevent the color suppression treatment from being performed on the non-skin-colored area.

The color difference signals RY'and BY' performed by the color suppression processing unit 204 as described above are sent to the RGB signal conversion unit 206. After step S305, the processing of the image processing unit 105 proceeds to step S306.

In step S306, the contour enhancement processing unit 205 performs contour enhancement processing on the luminance signal Y, and the contour-enhanced luminance signal Y'is sent to the RGB signal conversion unit 206. After step S306, the processing of the image processing unit 105 proceeds to step S307.

In step S307, the RGB signal conversion unit 206 responds to the luminance signal Y ′ supplied from the contour enhancement processing unit 205 and the color difference signals RY ′, BY ′ supplied from the color suppression processing unit 204. Performs RGB signal conversion processing. The R', G', and B'signals obtained by this RGB signal conversion process are sent to the shine correction unit 207. After step S307, the processing of the image processing unit 105 proceeds to step S308.

In step S308, the shine correction unit 207 sends the shine correction signals Rh, Gh, Bh generated by the correction signal generation unit 203 to the R', G', B'signals supplied from the RGB signal conversion unit 206. Performs shine correction processing based on. Specifically, assuming that the shine correction coefficient for adjusting the degree of shine correction is α, the shine correction unit 207 generates Rt, Gt, and Bt signals after the shine correction process by performing the calculation of the equation (4). To do. The shine correction coefficient α is a value in the range of "0.0" to "1.0". The shine correction coefficient α may be appropriately set according to an instruction from the user via the operation unit 115.

Rt = R'-α x Rh
Gt = G'-α × Gh equation (4)
Bt = B'-α x Bh

In this way, the shine correction unit 207 reduces the shine by subtracting the shine correction signals Rh, Gh, Bh and R', G', B'signals calculated based on the complementary colors of the skin in the high brightness region. It is possible to generate the R, G, B signals. The Rt, Gt, and Bt signals generated by performing the shiny correction processing by the shiny correction unit 207 are sent to the gamma processing unit 208. After step S308, the processing of the image processing unit 105 proceeds to step S309.

In step S309, the gamma processing unit 208 performs gamma processing on the Rt, Gt, and Bt signals supplied from the shine correction unit 207. The Rg, Gg, and Bg signals after the gamma processing by the gamma processing unit 208 are sent to the luminance color difference signal conversion unit 209. After step S309, the processing of the image processing unit 105 proceeds to step S310.

In step S310, the luminance color difference signal conversion unit 209 converts the Rg, Gg, and Bg signals supplied from the gamma processing unit 208 into the luminance signal Y and the luminance signals RY, BY. The luminance signal Y and the luminance signals RY, BY converted by the luminance color difference signal conversion unit 209 are sent to the codec unit 110. The codec unit 110 compresses and encodes the luminance signal Y and the color difference signals RY and BY. The compressed coded data is recorded on the recording medium 112 via the I / F unit 111. After step S310, the image processing unit 105 ends the processing of the flowchart of FIG.

As described above, according to the digital camera 100 of the present embodiment, a shine correction signal used for shine correction for a high-luminance region of a predetermined subject area is generated. Then, the digital camera 100 of the present embodiment performs a shine correction process based on the shine correction signal on the image signal after the color suppression process whose characteristic of suppressing the color signal is adjusted according to the brightness level of the input image. ing. As a result, in the digital camera 100 of the present embodiment, when a subject such as a person is photographed, the brightness value in the high-luminance region such as shine can be reduced, and an image in which the coloring phenomenon is reduced can be obtained. It is possible.

<Other Embodiments>
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or recording medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. Further, in the present invention, each function of the above-described embodiment can be realized by the cooperation of the circuit (for example, ASIC) and the program.

The above-described embodiments are merely examples of embodiment in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

100 digital camera, 103 imaging unit, 105 image processing unit, 106 image memory, 110 codec unit, 113 face detection unit, 114 system control unit, 115 operation unit, 116 non-volatile memory, 117 system memory, 112 recording medium, 200 simultaneous Chemical processing unit, 201 WB processing unit, 202 luminance color difference signal conversion unit, 203 shine correction signal generation unit, 204 color suppression processing unit, 205 contour enhancement processing unit, 206 RGB signal conversion unit, 207 shine correction unit, 208 gamma processing unit , 209 Luminance color difference signal converter

Claims (8)

A generation means for generating a correction signal for correcting a high-luminance region of a predetermined subject from an input image,
A suppression processing means for suppressing a color signal according to the signal level of the input image, and
The image signal the color signal is suppressed by the suppression processing means, have a, a correction means for performing correction based on the correction signal,
The suppression processing means is an image processing device characterized in that the characteristic of suppressing a color signal is adjusted depending on whether or not it is in the image region of the predetermined subject. The image processing apparatus according to claim 1, wherein the generation means generates the correction signal based on a color signal ratio according to the characteristics of the predetermined subject. The generation means generates the correction signal for the high-luminance region based on the brightness level of the image region of the predetermined subject.
The image processing apparatus according to claim 1 or 2, wherein the suppression processing means adjusts the characteristic of suppressing the color signal according to the luminance level when the correction signal is generated. The image processing apparatus according to claim 2 or 3 , wherein the suppression processing means adjusts a characteristic of suppressing the color signal according to the color signal ratio. The generation means generates a complementary color signal according to the characteristic of the predetermined subject from the average value of each of the red, green, and blue color signals representing the color signal ratio according to the characteristic of the predetermined subject, and the complementary color. The method according to any one of claims 2 to 4 , wherein the correction signal is generated by multiplying the signal by the brightness gain according to the brightness level of the image region of the predetermined subject. Image processing device. The correction means subtracts each color signal obtained by multiplying the correction signal by a predetermined correction coefficient from the red, green, and blue color signals of the image signal after the suppression is performed by the suppression processing means. The image processing apparatus according to claim 5 , wherein the correction is performed. A generation process for generating a correction signal for correcting a high-luminance region of a predetermined subject from an input image,
A suppression processing step of suppressing a color signal according to the signal level of the input image, and
The image signal the color signal is suppressed by the suppression processing step, have a, a correction step of performing correction based on the correction signal,
The image processing method of an image processing apparatus, characterized in that, in the suppression processing step, the characteristic of suppressing a color signal is adjusted depending on whether or not the image region is the predetermined subject. A program for causing a computer to function as each means of the image processing apparatus according to any one of claims 1 to 6.

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