JP5515653B2 - Imaging apparatus and image processing apparatus - Google Patents

Description

  The present invention relates to an imaging apparatus and an image processing apparatus.

  Conventionally, as shown in Patent Document 1, for example, it is known that a histogram changes before and after a gamma conversion process for an image captured by an imaging apparatus.

JP 2006-295814 A

  By the way, for example, when electronic development processing is performed on a RAW image to obtain a developed image in JPEG format or the like, the histogram may change between the RAW image and the developed image in the same manner as described above. Further, there is a demand for means for allowing a user to easily check for the presence of white stripes or blackout in an image acquired in a mode for recording a RAW image.

  Accordingly, an object of the present invention is to provide means for allowing a user to easily confirm gradation information of an image before development processing even at the time of confirmation of the developed image.

An imaging apparatus according to an aspect of the present invention includes an imaging unit that captures an image of a subject, an image processing unit, a gradation information generation unit, and a display control unit. The image processing unit performs electronic development processing on the first image in the RAW format with the Bayer array structure obtained from the imaging unit to generate a second image. The gradation information generation unit, based on the first image and the second image, the first gradation information regarding the gradation for each color component of the R component, the G component, and the B component of the first image , and the R component of the second image , Second gradation information relating to the gradation for each color component of the G component and the B component is generated. The display control unit controls to display at least one of the first gradation information and the second gradation information generated by the gradation information generation unit on the display unit. The gradation information generation unit uses only the pixel value of one of the two pixels corresponding to the G component when generating the first gradation information, or uses the average value of the pixel values of the two pixels. As a result, the number of pixels is matched between the color components of the R component, the G component, and the B component.

In the one aspect described above, the gradation information generation unit performs pixel thinning or pixel value averaging for each of the R component, the G component, and the B component when generating the second gradation information. The number of pixels of each color component may be matched with the first gradation information.
In the one aspect described above, the display control unit may control to superimpose and display the first gradation information and the second gradation information generated by the gradation information generation unit.

  Further, the imaging apparatus according to the one aspect described above records a first image obtained from the imaging unit and a second image subjected to development processing by the image processing unit as a recording mode for recording the image in the storage unit. There may be provided a recording mode selection means for selecting a recording mode and a second recording mode for recording only the second image. When the first recording mode is selected by the recording mode selection unit, the display control unit displays the first gradation information related to the first image generated by the gradation information generation unit and the second gradation related to the second image. Information may be controlled to be displayed. In addition, when the second recording mode is selected by the recording mode selection unit, the display control unit may control to display only the second gradation information related to the second image.

An imaging apparatus according to another aspect of the present invention includes an imaging unit that captures an image of a subject, an image processing unit, a gradation information generation unit, and an image file generation unit. The image processing unit performs electronic development processing on the first image in the RAW format with the Bayer array structure obtained from the imaging unit to generate a second image. The gradation information generation unit generates first gradation information related to the gradation for each color component of the R component, the G component, and the B component of the first image based on the first image. The image file generation unit generates a second image file including at least the second image that has been electronically developed by the image processing unit and the first gradation information generated by the gradation information generation unit. The gradation information generation unit uses only the pixel value of one of the two pixels corresponding to the G component when generating the first gradation information, or uses the average value of the pixel values of the two pixels. As a result, the number of pixels is matched between the color components of the R component, the G component, and the B component.

In the other aspect described above, the image file generation unit generates a second floor related to the gradation for each color component of the R component, the G component, and the B component of the second image generated by the gradation information generation unit in the second image file. Key information may be added.

  In the other aspect described above, the image file generation unit may generate a first image file of the first image. In addition, the imaging device according to another aspect described above may further include a recording control unit that associates the first image file and the second image file generated by the image file generation unit and records them in the storage unit.

  At this time, the image file generation unit according to another aspect generates search data including at least first image identification information indicating the first image, second image identification information indicating the second image, and first gradation information. Also good. The recording control unit according to another aspect may associate the first image file generated by the image file generation unit, the second image file, and the search data in association with each other and record them in the storage unit.

An image processing apparatus according to still another aspect of the present invention includes an image processing unit that performs image processing on a first image in a RAW format with an input Bayer array structure, and generates a second image; a gradation information generation unit; A display control unit. The gradation information generation unit includes first gradation information relating to gradations for each of the R component, G component, and B component of the first image , and each of the R component, G component, and B component of the second image. 2nd gradation information regarding the gradation of the second is generated. The display control unit controls to display at least one of the first gradation information and the second gradation information generated by the gradation information generation unit on the display unit. The gradation information generation unit uses only the pixel value of one of the two pixels corresponding to the G component when generating the first gradation information, or uses the average value of the pixel values of the two pixels. As a result, the number of pixels is matched between the color components of the R component, the G component, and the B component.

  According to the imaging apparatus of the present invention, an image file is generated by associating the first gradation information related to the first image input from the imaging unit to the image processing apparatus and the second image obtained by the development processing of the first image Therefore, the user can easily confirm the gradation information related to the first image before the development process together with the confirmation of the second image after the development process.

1 is a block diagram illustrating a configuration example of an electronic camera according to a first embodiment. 1 is a flowchart showing an operation example of the electronic camera of the first embodiment. The figure which shows the example of a display of the histogram in 1st Embodiment. The figure which shows the example of data recording with the electronic camera of 1st Embodiment. The figure which shows the example of data recording with the electronic camera of 2nd Embodiment

<Description of First Embodiment>
In the first embodiment, an imaging apparatus according to the present invention is illustrated. FIG. 1 is a block diagram illustrating a configuration example of an electronic camera as an imaging apparatus. The electronic camera of the first embodiment has three recording modes from the first recording mode to the third recording mode as sub-modes of the imaging mode.
The electronic camera in the first recording mode has both RAW format color image data (RAW image) and image data obtained by subjecting the RAW image to electronic development processing (digital development processing) (development image data). Record. Further, the electronic camera in the second recording mode records the data of the developed image by the electronic camera in the second recording mode. The electronic camera in the third recording mode records RAW image data.

  The electronic camera includes an imaging optical system 11, an imaging device 12, a DFE 13, a CPU 14, a media I / F 15, a first memory 16 and a second memory 17, an operation unit 18, and a monitor 19. Yes. Here, the DFE 13, the media I / F 15, the first memory 16 and the second memory 17, the operation unit 18, and the monitor 19 are each connected to the CPU 14.

  The image pickup device 12 is a device that picks up an image of an object formed by a light beam that has passed through the image pickup optical system 11. The output of the image sensor 12 is connected to the DFE 13. Note that the image sensor 12 of the present embodiment may be a progressive scanning solid-state image sensor (CCD or the like) or an XY address type solid-state image sensor (CMOS or the like).

  A plurality of light receiving elements are arranged in a matrix on the light receiving surface of the imaging element 12. In addition, red (R), green (G), and blue (B) color filters are arranged in each light receiving element of the imaging element 12 according to a known Bayer array. Therefore, each light receiving element of the imaging element 12 outputs an image signal corresponding to each color by color separation in the color filter. Thereby, the image sensor 12 can acquire a color image at the time of imaging.

  The DFE 13 is a digital front-end circuit that performs signal processing such as A / D conversion of image signals input from the image sensor 12 and correction of defective pixels. The DFE 13 forms an imaging unit together with the imaging device 12 in the present embodiment, and outputs an image signal input from the imaging device 12 to the CPU 14 as RAW image data. Here, the RAW image is digital image data in which the relationship between the output signal value and the amount of incident light is linear. This RAW image may have been subjected to defective pixel correction processing. Further, the RAW image may be a mosaic image having a Bayer arrangement structure in a state before color interpolation, or may be a color image after color interpolation processing has been performed.

  The CPU 14 is a processor that comprehensively controls each unit of the electronic camera. For example, the CPU 14 performs a known autofocus (AF) control by contrast detection and a known automatic exposure (AE) calculation based on the output of the image sensor 12. Further, the CPU 14 operates as an image processing unit 21, a gradation information generation unit 22, a recording control unit 23, and an image file generation unit 24 by executing the program.

  The image processing unit 21 performs digital development processing on the RAW image data to generate developed image data. Here, the digital development processing is image processing for converting a RAW image into an image corresponding to a photograph. As an example, the digital development processing includes tone conversion processing, noise removal processing, contour enhancement processing, and color conversion processing (such as calculation using a color conversion matrix).

  The gradation information generation unit 22 analyzes the RAW image and the developed image, respectively, and generates information on the luminance frequency distribution in each image as gradation information.

  The image file generation unit 24 generates an image file of a RAW image or an image file of a developed image in association with the information generated by the gradation information generation unit 22 in accordance with the recording mode setting described above. The recording control unit 23 records the image file generated by the image file generation unit 24 in a storage unit described later.

  The electronic camera in the present embodiment includes a storage medium 25, a first memory 16, and a second memory 17 as one aspect of the storage unit.

  A non-volatile storage medium 25 can be detachably connected to the media I / F 15. The media I / F 15 executes data writing / reading with respect to the storage medium 25. The storage medium 25 is composed of a hard disk, a memory card incorporating a semiconductor memory, or the like. In FIG. 1, a memory card is illustrated as an example of the storage medium 25.

  The first memory 16 is a volatile buffer memory that temporarily stores image data before and after image processing. The second memory 17 is a non-volatile flash memory that stores various programs executed by the CPU 14. The second memory 17 may have a storage area for storing image files and the like.

  The operation unit 18 receives, for example, a recording mode switching input, a still image (main image) imaging instruction accompanying recording on the storage medium 25, and the like from the user. The CPU 14 performs switching control of the above three recording modes based on the input from the operation unit 18.

  The monitor 19 displays various images under the control of the CPU 14. For example, after capturing the main image, the CPU 14 can reproduce and display the captured image on the monitor 19. The CPU 14 can also display information generated by the calculation unit 22 on the monitor 19.

  Next, an operation example of the electronic camera in the first embodiment will be described with reference to the flowchart of FIG. In the operation example of FIG. 2, it is assumed that the electronic camera is in the state set in the first recording mode. 2 is started when the CPU 14 receives from the user an instruction to capture a main image (for example, full-press operation of a release button included in the operation unit 18).

  Step S101: The CPU 14 drives the imaging device 12 in accordance with a user's imaging instruction to capture the main image. An image signal output from the image sensor 12 passes through the DFE 13 in a pipeline manner and is input to the CPU 14. The raw image data is buffered in the first memory 16 under the control of the CPU 14. The CPU 14 in the first embodiment holds the RAW image before the white balance adjustment and the color interpolation process in the first memory 16 as the first image to be recorded in the storage medium 25.

  Step S102: The gradation information generation unit 22 obtains a frequency distribution of gradation values in the first image (S101) as gradation information related to the first image. As an example, the gradation information generation unit 22 obtains a frequency distribution of gradation values for each of the RGB channels of the first image.

  Note that since the first image in the first embodiment is an image before color interpolation, the number of pixels of the G channel is twice that of the R and B channels. Therefore, the gradation information generation unit 22 in S102 normalizes the number of pixels between channels when obtaining the above frequency distribution. For example, when obtaining the frequency distribution of the G channel, the calculation unit 22 may sample only one of the Gr pixel and the Gb pixel, or the calculation unit 22 may take an average value of the Gr pixel and the Gb pixel.

  Here, it can be estimated that the pixel whose gradation value indicates the upper limit value of the gradation range in the first image is a pixel in which gradation is lost due to white stripes due to excessive light amount. Therefore, the number (frequency) of pixels corresponding to the upper limit value of the gradation range in the frequency distribution of S102 is information indicating the number of pixels in which gradation is lost due to white stripes in the first image. For example, when the gradation range of an image is expressed by 8 bits (0-255), a pixel with a gradation value of 255 corresponds to a white-toned pixel.

  On the other hand, it can be estimated that the pixel whose gradation value indicates the lower limit value of the gradation range in the first image is a pixel whose gradation is lost due to black crushing due to insufficient light quantity. Therefore, the number (frequency) of pixels corresponding to the lower limit value of the gradation range in the frequency distribution of S102 is information indicating the number of pixels in which the gradation is lost due to black crushing in the first image. For example, when the gradation range of an image is expressed by 8 bits, a pixel with a gradation value of 0 corresponds to a blackened pixel.

  Step S103: The image file generation unit 24 associates the header data including various information such as the image shooting conditions (exposure time, aperture value, etc.) and the file name of the image with the data of the first image and RAW. Generate an image file for the image. Then, the recording control unit 23 records the image file of the RAW image on the storage medium 25 via the media I / F 15 (see FIG. 4).

  Step S104: The image processing unit 21 performs digital development processing on the first image to generate an RGB developed image (second image). The second image data is temporarily stored in the first memory 16 under the control of the CPU 14.

  Step S105: The gradation information generation unit 22 obtains a frequency distribution of gradation values in the second image (S104) as gradation information related to the second image. As an example, the gradation information generation unit 22 obtains a frequency distribution of gradation values for each of the RGB channels of the second image.

  In addition, when generating the frequency distribution of the second image, the gradation information generation unit 22 normalizes the number of pixels in each channel so that the number of pixels is the same as that of the frequency distribution (S102) of the first image. Do. For example, the gradation information generation unit 22 may perform pixel thinning or pixel value averaging so that the number of pixels in each channel is ¼. Thereby, it is possible to compare the frequency distribution of the gradation values in S102 with the frequency distribution of the gradation values in S105.

  Here, it can be estimated that the pixel in which the gradation value indicates the upper limit value of the gradation range in the second image is a pixel in which the gradation is lost due to white stripes before and after the development processing. Therefore, the number (frequency) of pixels corresponding to the upper limit value of the gradation range in the frequency distribution of S105 is information indicating the number of pixels that have lost gradation due to white stripes in the second image.

  On the other hand, it can be estimated that a pixel whose gradation value indicates the lower limit value of the gradation range in the second image is a pixel whose gradation is lost due to black crushing before and after the development processing. Therefore, the number of pixels (frequency) corresponding to the lower limit value of the gradation range in the frequency distribution of S105 is information indicating the number of pixels in which the gradation is lost due to black crushing in the second image.

  Step S106: The image processing unit 21 converts the RGB developed image data into the YCbCr format. In addition, the image processing unit 21 in the first embodiment compresses developed image data in the JPEG format.

  Step S107: The CPU 14 reproduces and displays the developed image captured this time on the monitor 19 until recording of the image file of the developed image is completed. This makes it easy for the user to check the focus and composition of the captured image.

  At this time, the CPU 14 in the first embodiment, according to the user setting, information on the frequency distribution of the gradation values of the first image (S102) and information on the frequency distribution of the gradation values of the second image (S105). Is displayed on the monitor 19.

  As an example, the CPU 14 in S107 displays the histogram of the same channel of the first image and the second image superimposed on the monitor 19 (see FIG. 3). Further, the CPU 14 switches the channel of the histogram displayed on the monitor 19 in accordance with a user operation.

  The vertical axis in FIG. 3 indicates the frequency, and the horizontal axis in FIG. 3 indicates the gradation value. In FIG. 3, the histogram of the first image is indicated by a line graph (broken line), and the histogram of the second image is indicated by a bar graph (solid line and hatching). By referring to the two histograms displayed on the monitor 19, the user can easily determine the presence or absence of white stripes and blackouts in the developed image and the presence or absence of white stripes and blackouts in the RAW image. As an example, FIG. 3 shows a case where white stripes occur in the developed image, but there are no white stripes or blackouts in the RAW image.

  In S107, the CPU 14 may display the histograms side by side on the screen of the monitor 19 in addition to the superimposed display of the histograms of the first image and the second image shown in FIG. 3, or the first image and the second image. These histograms may be alternately displayed on the screen of the monitor 19 (illustration of these display forms is omitted).

  Step S108: The image file generating unit 24 develops the image data (exposure time, aperture value, etc.), header data including various information such as the image file name, and the second image data in association with each other. Generate an image file for the image. Then, the recording control unit 23 records the image file of the developed image on the storage medium 25 via the media I / F 15. The image file of the developed image is generated in a format compliant with, for example, the Exif (Exchangeable image file format for digital still cameras) standard or the TIFF / EP standard.

  FIG. 4 is a diagram illustrating an example of data recording in the electronic camera of the first embodiment. The image file of the developed image in the first embodiment includes header data and developed image data in the YCbCr format (JPEG image data after the processing in S106).

  In addition, the header data of the image file of the developed image includes, for example, various information such as image shooting conditions (exposure time, aperture value, etc.), frequency distribution information regarding the gradation of the first image, and the second image level. Information on the frequency distribution related to the key and file name information indicating the image file name of the corresponding RAW image are included.

  Accordingly, when the image file of the developed image is read by a computer in a post-processing step after image capturing (image processing by application software), the user can refer to the frequency distribution information relating to the gradation of the second image. Thus, it is possible to easily determine the presence or absence of white stripes and black crushing in the developed image. Similarly, the user can easily determine the presence or absence of white stripes and blackouts in the RAW image by referring to the frequency distribution information related to the gradation of the first image associated with the second image.

  Further, by referring to the file name information of the RAW image included in the header data, the user can specify the image file of the RAW image corresponding to the developed image.

  In the description of FIG. 2 described above, regarding the data recording control, the buffering of the image data to the first memory 16 is executed by the control of the CPU 14, but the present invention is not limited to this configuration, and the storage control is performed. The unit 23 may execute buffering of image data or the like in the first memory 16 and recording of the image file in the storage medium 25. Above, description of the flowchart of FIG. 2 is complete | finished.

  In the present embodiment, when the second recording mode is selected, the CPU 14 reproduces and displays the developed image captured this time on the monitor 19 until recording of the image file of the developed image is completed at the time of shooting. In this case, the CPU 14 performs control to display the frequency distribution of the gradation values of the developed image on the monitor 19 according to the user setting.

  The electronic camera of the first embodiment generates tone information of a RAW image and tone information of a developed image in a mode for recording a RAW image and a developed image (S102, S105). The electronic camera records the RAW image gradation information and the developed image gradation information in the image file of the developed image (S108). Therefore, in the first embodiment, since the RAW image gradation information is given as the metadata of the image file of the developed image, the user can obtain useful information in the post-processing step after shooting.

  An image whose gradation has been lost due to white stripes or blackout cannot be recovered even in the post-processing steps described above, so the presence or absence of white stripes or blackout in the captured image is very important. Information. When both the RAW image and the developed image are recorded, even if the tone of the developed image is lost, if the tone of the RAW image is not lost, a high-quality image is obtained from the RAW image in a post-processing step. be able to. On the other hand, when the gradation is lost in both the RAW image and the developed image, it is preferable to adjust the image of another image taken with different exposure. In the example of the first embodiment, it is possible to determine whether the gradation of the original RAW image acquired at the same time is lost just by browsing the image file of the developed image, and the convenience of the user for selecting the image adjustment target is great. improves.

  Further, the electronic camera of the first embodiment displays the RAW image gradation information and the developed image gradation information on the monitor 19 after photographing (S107). Therefore, the user can determine the presence or absence of white stripes and blackout in the RAW image from the histogram of the RAW image, and the user can easily determine whether re-shooting is necessary.

  In the above embodiment, both the RAW image gradation information and the developed image gradation information are added as the header data of the developed image file. However, the present invention is not limited to this. For example, it may be possible to determine whether or not there is a pixel in which the gradation is lost in the developed image from the developed image displayed on the monitor without looking at the gradation information of the developed image. There may be cases where key information is not required. Therefore, only the RAW image gradation information may be added as the header data of the developed image file. Even in this case, as in the above-described embodiment, the gradation information of the RAW image included in the header data of the developed image can be referred to. Therefore, it is possible to easily check for the presence of white stripes and blackout in the RAW image. . Furthermore, the capacity of the image file can be made smaller than that containing both the RAW image gradation information and the developed image gradation information. When it is necessary to check the tone information of the developed image, the tone information generating unit generates tone information of the developed image each time based on the data of the developed image in the image file. What is necessary is just to display on a monitor.

<Description of Second Embodiment>
FIG. 5 is a diagram illustrating an example of data recording in the electronic camera of the second embodiment. Since the configuration of the electronic camera of the second embodiment is the same as that shown in FIG.

  The second embodiment is a modification of the first embodiment, and in the first recording mode in which both the RAW image and the developed image are recorded, the image file generating unit 24 An image file of a RAW image (first image), an image file of a developed image (second image), and search data are generated, and the recording control unit 23 records these in association with each other in the storage medium 25.

  The search data is separate from the image file, and is generated once for each shooting. The search data includes gradation information of the first image, gradation information of the second image, image file name information of the first image as first image identification information, and second image identification information. Information of the image file name of the second image, and the information is recorded in association with each other. When a plurality of shootings are performed in the first recording mode, the image file generation unit 24 generates a plurality of search data to be generated in one file, and the recording control unit 23 records the one file. May be. The search data only needs to include at least the gradation information of the first image, the information of the image file name of the first image, and the information of the image file name of the second image, and the gradation information of the second image. It is not necessary to have.

  In the example of the second embodiment, it is possible to determine whether the gray level of the RAW image is lost by browsing the search data, and the convenience of the user who selects the image adjustment target is greatly improved.

<Supplementary items of the embodiment>
(1) In each of the above embodiments, the CPU 14 may use an image obtained by performing at least one of white balance adjustment processing and color interpolation processing on a RAW image as the first image.

  (2) In each of the above embodiments, the image file generation unit 24 uses only the frequency of white stripes and the frequency of blackout as the second image among the frequency distributions related to the gradation of the first image and the second image. An image file may be generated in association with each other. Similarly, in the process of S107 in FIG. 2, the CPU 14 displays on the monitor 19 the frequency of white highlight and blackout in the first image, and the frequency of white highlight and blackout in the second image, The display of the histogram may be omitted.

  Further, using the frequency distribution information relating to the gradation of the first image and the second image, the presence or absence of white stripes or blackouts in the RAW image and the presence or absence of white stripes or blackouts in the developed image are displayed ( The configuration of an electronic camera that records (or records) can be included in the technical scope of the present invention.

  (3) In the above embodiment, the operation example in the first recording mode in which both the RAW image and the developed image are recorded has been described. However, the present invention is not limited to this. For example, when the developed image for composition confirmation is displayed on the monitor 19 in the third recording mode, the configuration of the electronic camera that displays the RAW image and the histogram of the developed image can be included in the technical scope of the present invention. .

  (4) In the process of S107 in FIG. 2, the CPU 14 sets, on the monitor 19, the positions of the pixels that are white or blackout in the first image and the positions of the pixels that are white or blackout in the second image, respectively. It may be displayed. For example, the CPU 14 may use the developed image displayed on the monitor 19 to emphasize the position of the above pixel by reverse display or the like.

  (5) In each of the above-described embodiments, an example has been described in which the CPU 14 implements the functions of the image processing unit 21, the gradation information generation unit 22, the recording control unit 23, and the image file generation unit 24 by software using a program. However, part or all of these configurations may be realized by hardware.

  (6) In the above embodiment, an electronic camera has been described as an example of an imaging apparatus, but the present invention is not limited to this. For example, as another example of the imaging device, a device capable of capturing an image of a subject such as a digital video camera or a mobile phone with a camera can be cited.

  (7) Further, the present invention can be applied to an image processing apparatus that is connected to an imaging apparatus, inputs an image signal from the imaging apparatus, and performs image processing such as development processing on the input image signal. It is. In this case, based on the original image (for example, RAW image) input from the imaging device, as described above, the gradation information of the original image is generated, and then the processed image (for example, the developed image) on which image processing has been performed. ) And gradation information relating to the image. Then, an image file may be created by associating these information with the image and recorded in the recording unit. Alternatively, the image processing apparatus may display at least one of the gradation information of the original image and the gradation information of the processed image on the display unit.

  It should be noted that the present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The present invention is defined by the claims, and the present invention is not limited to the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 11 ... Imaging optical system, 12 ... Imaging element, 13 ... DFE, 14 ... CPU, 15 ... Media I / F, 16 ... 1st memory, 17 ... 2nd memory, 18 ... Operation part, 19 ... Monitor, 21 ... Image Processing unit, 22 ... gradation information generation unit, 23 ... recording control unit, 24 ... image file generation unit, 25 ... storage medium

Claims (5)

An imaging unit that captures an image of a subject;
An image processing unit that electronically develops a first image in RAW format with a Bayer array structure obtained from the imaging unit to generate a second image;
Based on said first image and said second image, R component of the first image, the first gray level information about the tone of each color component of the G component and the B component, R component of the second image, G component And a gradation information generation unit that generates second gradation information related to gradation for each color component of the B component ,
A display control unit that controls to display at least one of the first gradation information and the second gradation information generated by the gradation information generation unit on a display unit ;
The gradation information generation unit uses the pixel value of only one of the two pixels corresponding to the G component when generating the first gradation information, or an average value of the pixel values of the two pixels An image pickup apparatus that matches the number of pixels among the color components of the R component, the G component, and the B component by using. The imaging device according to claim 1,
When generating the second gradation information, the gradation information generation unit performs pixel thinning or pixel value averaging for each color component of the R component, the G component, and the B component. An imaging device that matches a number with the first gradation information . In the imaging device according to claim 1 or 2,
The imaging apparatus that controls the display control unit to superimpose and display the first gradation information and the second gradation information generated by the gradation information generation unit . An imaging unit that captures an image of a subject;
An image processing unit that electronically develops a first image in RAW format with a Bayer array structure obtained from the imaging unit to generate a second image;
A gradation information generation unit that generates first gradation information related to gradations for each color component of the R component, the G component, and the B component of the first image based on the first image;
Image file generation for generating a second image file including at least the second image that has been electronically developed by the image processing unit and the first gradation information generated by the gradation information generation unit and a part,
The gradation information generation unit uses the pixel value of only one of the two pixels corresponding to the G component when generating the first gradation information, or an average value of the pixel values of the two pixels An image pickup apparatus that matches the number of pixels among the color components of the R component, the G component, and the B component by using. An image processing unit that performs image processing on the first image in the RAW format with the input Bayer arrangement structure, and generates a second image;
  First gradation information relating to the gradation of each of the R component, G component, and B component of the first image, and the first gradation information relating to the gradation of each of the R component, G component, and B component of the second image. A gradation information generation unit for generating two gradation information;
  A display control unit that controls to display at least one of the first gradation information and the second gradation information generated by the gradation information generation unit on a display unit;
  The gradation information generation unit uses the pixel value of only one of the two pixels corresponding to the G component when generating the first gradation information, or an average value of the pixel values of the two pixels By using the image processing apparatus, the number of pixels is matched between the color components of the R component, the G component, and the B component.

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