JP2009118001A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus capable of performing white balance correction as design by taking into consideration a difference in color temperature caused by individual differences and the aged deterioration of a light emitting diode in photographing accompanied by the lighting of the light emitting diode. <P>SOLUTION: When correcting the white balance of image data for recording obtained by photographing with a LED lighted, image data with a LED lighted for LED color estimation and image data with the LED put out for LED color estimation are obtained. A WB correction coefficient calculating part calculates a color change amount of a subject caused by the lighting of the LED from the image data with LED lighted for LED color estimation and the image data with the LED put out for LED color estimation (step S303), and modifies a WB correction coefficient corresponding to a specific light source stored in a flash memory according to the calculated color change amount (step S305). A WB correction processing part performs the white balance correction of the image data for recording by using the modified WB correction coefficient. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image pickup apparatus including an image pickup device, and more particularly to an image pickup apparatus capable of shooting with light emission of a light emitting diode.

  2. Description of the Related Art In recent years, imaging devices that can take pictures with light emission of light emitting diodes have been developed. In general, a light emitting diode has a smaller amount of light than a flash using a xenon tube, but can emit light for a long time. For this reason, it may be more appropriate to use a light emitting diode in macro mode photography or the like where the amount of light is too large for a xenon tube.

  On the other hand, light emitting diodes have a greater variation in color temperature due to the elements than xenon tubes, and even an image pickup apparatus using the same elements may not always expect white balance as designed.

  As one means for solving this problem, Patent Document 1 detects the color temperature of a light emitting diode, stores correction information based on the detection result in advance, and performs white balance correction using the correction information. A method has been proposed.

Patent Document 2 discloses a white balance correction at the time of strong light emission by using image data obtained at the time of no light emission and weak light emission in an imaging device including a light emitting means capable of strong light emission and weak light emission. A method for calculating the value has been proposed.
JP 2004-228723 A JP 2006-108970 A

  Here, the variation in the color temperature of the light emitting diode described above is greatly influenced by individual differences and aging degradation. Further, when shooting in a state where the distance to the subject is close as in macro mode shooting, the light amount of the light emitting diode is larger than the amount of ambient light, and the color change of the subject due to the light emitting diode is large. Therefore, in particular, it is necessary to consider the difference in color temperature due to individual differences and aging.

  Here, although the method of Patent Document 1 can correct the variation in color temperature due to individual differences of the light emitting diodes, the color temperature variation due to aging is not particularly taken into consideration. In addition, the technique of Patent Document 2 does not particularly take into consideration the variation in color temperature due to the difference in characteristics of the light emitting diodes between weak light emission and strong light emission.

  The present invention has been made in view of the above-described circumstances, and performs white balance correction as designed in consideration of differences in individual light emitting diodes and color temperature differences due to aging in shooting with lighting of the light emitting diodes. An object of the present invention is to provide an imaging device capable of performing the above.

  In order to achieve the above object, an imaging device according to a first aspect of the present invention includes an imaging unit that captures an image to obtain image data, a light emitting diode that illuminates the object, and a white balance that corresponds to a specific light source. A storage unit that stores a correction coefficient; and a white balance correction unit that corrects a white balance of the image data obtained by the photographing based on the stored white balance correction coefficient. When correcting the white balance for the first image data obtained by photographing with the light emitting diode turned on, the second image data obtained by photographing with the light emitting diode turned on and the light emitting diode are turned off. By the lighting of the light emitting diode, which is estimated from the third image data obtained by the captured image. Based on the color variation of the object caused, and correct the white balance correction coefficients corresponding to the stored specific light source, and correcting the white balance by using the white balance correction coefficients the corrected.

  In order to achieve the above object, an image pickup apparatus according to a second aspect of the present invention includes an image pickup unit that picks up a subject to obtain image data, a light-emitting diode that illuminates the subject, and an image obtained by the photographing. A white balance correction unit that calculates a white balance correction coefficient from the data and corrects the white balance of the image data based on the calculated white balance correction coefficient, and the white balance correction unit lights up the light emitting diode. When correcting the white balance with respect to the first image data obtained by the photographing, the second image data obtained by the photographing with the light emitting diode turned on and the photographing with the light emitting diode turned off are obtained. Estimated from the third image data obtained and caused by the lighting of the light emitting diode. Body and color variation amount of the calculated white balance correction coefficient based on the first image data, and correcting the white balance by using the white balance correction coefficient issued the calculated.

  According to the present invention, it is possible to provide an imaging apparatus capable of performing white balance correction as designed by taking into account individual differences of light emitting diodes and differences in color temperature due to aging in shooting with lighting of the light emitting diodes. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in the embodiments described below do not limit the scope of the present invention.

[First Embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a block diagram of a digital still camera as an example of an imaging apparatus according to the first embodiment of the present invention. A digital still camera shown in FIG. 1 includes a lens 101, an image sensor 102, an analog processing unit 103, an analog / digital (A / D) conversion unit 104, a bus 105, an image processing unit 106, and a JPEG processing unit. 107, microcomputer 108, SDRAM 109, memory interface (I / F) 110, LCD driver 111, LED control unit 113, LED 114, operation unit 115, flash memory 116, recording medium 117, An LCD 118, an AE processing unit 119, and an AF processing unit 120 are included.

  The lens 101 has a diaphragm mechanism and a lens driving mechanism, and condenses an optical image of a subject on the image sensor 102. The aperture mechanism and the lens driving mechanism are driven in accordance with instructions from the microcomputer 108.

  The image sensor 102 is configured by arranging a Bayer array color filter in front of a photodiode. In the Bayer array, there are a line in which R pixels and G (Gr) pixels are alternately arranged in the horizontal direction, and a line in which G (Gb) pixels and B pixels are alternately arranged, and the two lines are vertically arranged. It is configured by alternately arranging in the direction. Such an image sensor 102 receives light collected by the lens 101 by a photodiode in each pixel and performs photoelectric conversion, thereby converting the amount of light into an electrical signal (analog image signal) and an analog processing unit. To 103. Note that the image sensor 102 may be either a CMOS system or a CCD system, but preferably has an electronic shutter function capable of electronically controlling the exposure time. The image sensor 102 is provided with a mechanical shutter (not shown), and the exposure time of the image sensor 102 can be controlled by driving the mechanical shutter.

  The analog processing unit 103 performs waveform shaping on the analog image signal read from the image sensor 102 while reducing reset noise and the like, and further increases the gain so that the image brightness becomes the target brightness. The A / D conversion unit 104 converts the analog image signal processed by the analog processing unit 103 into a digital image signal (hereinafter referred to as image data).

  A bus 105 is a transfer path for transferring various data generated in the camera to each unit in the camera, and includes an A / D conversion unit 104, an image processing unit 106, a JPEG processing unit 107, a microcomputer 108, and the like. , SDRAM 109, memory I / F 110, LCD driver 111, AE processing unit 119, and AF processing unit 120. The image data obtained by the A / D conversion unit 104 is temporarily stored in the SDRAM 109 via the bus 105. The SDRAM 109 is a storage unit that temporarily stores various data such as image data obtained by the A / D conversion unit 104 and image data processed by the image processing unit 106 and the JPEG processing unit 107.

  The image processing unit 106 includes at least a WB correction coefficient calculation unit 151 and a WB correction processing unit 152 for performing white balance (hereinafter referred to as WB) correction processing of image data. A conversion processing unit and a noise reduction processing unit are included, and various image processing is performed.

  When performing the WB correction using the auto white balance (hereinafter referred to as AWB) correction function, the WB correction coefficient calculation unit 151 illuminates the subject when acquiring the image data from the color distribution of the image data read from the SDRAM 109. The light source that has been used is estimated, and a WB correction coefficient corresponding to the light source is calculated. Further, when correcting the white balance of the image data accompanied by the lighting of the LED 114, a WB correction coefficient considering the color change due to the lighting of the LED 114 is calculated. Details of the processing when the LED 114 is turned on will be described later.

  When performing WB correction using the AWB correction function, the WB correction processing unit 152 performs WB correction of image data using the WB correction coefficient calculated by the WB correction coefficient calculation unit 151, and an operation unit by a photographer When a preset WB is selected instead of AWB by the operation 115, WB correction of image data is performed using a WB correction coefficient for each light source corresponding to the preset WB recorded in advance in the flash memory 116. Further, when correcting the white balance of the image data accompanied by the lighting of the LED 114, the WB correction of the image data is performed using the WB correction coefficient calculated by the WB correction coefficient calculating unit 151 in consideration of the color change due to the lighting of the LED 114. I do.

  The color conversion processing unit performs processing for converting the image data depending on the characteristics of the image sensor 102 into an image color close to the photographer's image. The noise reduction processing unit reduces noise by performing low-pass filter processing. Note that the image data after the WB correction processing is synchronized with image data composed of RGB information per pixel from image data based on the Bayer array. Thereafter, the above-described color conversion processing, noise reduction processing, and the like are performed, and the processed image data is stored in the SDRAM 109.

  The AE processing unit 119 calculates subject luminance using the image data. The data for calculating the subject brightness may be an output of a dedicated photometric sensor. The AF processing unit 120 extracts high-frequency component signals from the image data, integrates the extracted high-frequency component signals, and obtains a focus (AF) evaluation value for AF.

  The JPEG processing unit 107 reads out RGB image data from the SDRAM 109 and performs compression according to a JPEG compression method or the like. The compressed image data is temporarily stored in the SDRAM 109 and then recorded on the recording medium 117 via the memory I / F 110. Here, the recording medium 117 is, for example, a recording medium including a memory card that can be attached to and detached from the camera body, but is not particularly limited.

  The LCD driver 111 displays an image on the LCD 118. When JPEG compressed image data recorded on the recording medium 117 is reproduced, the JPEG compressed image data recorded on the recording medium 117 is read out, decompressed by the JPEG processing unit 107, and decompressed. The image data is temporarily stored in the SDRAM 109. The LCD driver 111 reads out the image data from the SDRAM 109, converts it into a video signal, and then outputs it to the LCD 118 to display an image.

  The microcomputer 108 comprehensively controls various sequences of the camera body. An LED control unit 113, an operation unit 115, and a flash memory 116 are connected to the microcomputer 108. The operation unit 115 is an operation member such as a power button, a release button, and various key inputs. When the operation unit 115 is operated by the user, the microcomputer 108 executes various sequences according to the user's operation. The flash memory 116 stores various parameters such as a white balance correction coefficient for preset WB correction, a low-pass filter coefficient, and various programs executed by the microcomputer 108. The microcomputer 108 controls various sequences in accordance with a program stored in the flash memory 116, reads parameters necessary for the various sequences from the flash memory 116, and gives instructions to the blocks in FIG.

  The LED control unit 113 receives an instruction from the microcomputer 108 and controls the current supplied to the LED 114.

  FIG. 2 is a flowchart showing processing at the time of photographing according to the first embodiment of the present invention. In FIG. 2, first, the microcomputer 108 determines whether or not the release button is half-pressed by the operation of the operation unit 115 by the user (step S201). If the release button is pressed halfway by the user in the determination in step S201 (Yes in step S201), the microcomputer 108 controls the LED control unit 113 to turn on the LED 114 (step S202). Next, the microcomputer 108 executes AF processing (step S203). That is, in response to an instruction from the microcomputer 108, the AF processing unit 120 reads out the image data taken in through the image sensor 102 and stored in the SDRAM 109, and calculates an AF evaluation value based on the read image data. Then, the microcomputer 108 drives the lens 101 to focus the lens 101 while evaluating the AF evaluation value calculated by the AF processing unit 120. After the AF process, the microcomputer 108 executes the AE process. That is, in response to an instruction from the microcomputer 108, the AE processing unit 119 reads out image data stored in the SDRAM 109, and calculates subject luminance based on the read-out image data. After calculating the subject brightness, the microcomputer 108 uses the subject brightness calculated by the AE processing unit 119, the aperture value stored in the flash memory 116 and the shutter speed determination table in advance, and the aperture value and shutter speed at the time of shooting. Are calculated (step S204).

  Next, the microcomputer 108 determines whether or not the release button has been fully pressed by the user's operation of the operation unit 115 (step S205). If it is determined in step S205 that the release button has been fully pressed by the user (Yes in step S205), the microcomputer 108 uses an aperture mechanism and a mechanical shutter mechanism (not shown) according to the aperture value and shutter speed calculated in step S204. Shooting is performed while controlling the exposure of the image sensor 102 by driving (step S206). Hereinafter, the image data obtained by photographing in step S206 is referred to as recording image data. This recording image data corresponds to the first image data.

  Next, the microcomputer 108 takes an image while controlling the exposure of the image sensor 102 using the electronic shutter function (step S207). The aperture value and electronic shutter speed at this time use the values calculated in step S204. Hereinafter, the image data obtained by photographing in step S207 is referred to as LED color estimation LED lighting image data. The LED lighting image data for LED color estimation corresponds to the second image data. Thereafter, the microcomputer 108 controls the LED control unit 113 to turn off the LED 114 (step S208), and then performs imaging while controlling the exposure of the image sensor 102 using the electronic shutter function (step S209). The aperture value and electronic shutter speed at this time use the values calculated in step S204. Hereinafter, the image data obtained by photographing in step S209 will be referred to as LED color estimation LED unlit image data. This LED color estimation LED unlit image data corresponds to the third image data.

  Next, the microcomputer 108 causes the image processing unit 106 to perform various image processing such as WB correction processing and color conversion processing on the recording image data (step 210). Then, the image data that has been subjected to image processing is JPEG compressed by the JPEG processing unit 107 (step S211). Finally, the microcomputer 108 records the image data compressed in JPEG format and stored in the SDRAM 109 on the recording medium 117 (step S212).

  As described above, the process of FIG. 2 is executed when the user presses the release button of the operation unit 115. The release button is in a pressed state of two states: a half-pressed state (first release state) and a fully-pressed state (second release state). In FIG. 2, the calculation of conditions necessary for shooting such as calculation of exposure conditions and control of flash emission amount is executed in the first release state, and shooting is actually performed in the second release state.

  FIG. 3 is a flowchart showing a WB correction coefficient calculation process at the time of WB correction performed by the WB correction coefficient calculation unit 151 in the image processing in step S210 of FIG.

  In FIG. 3, first, the WB correction coefficient calculation unit 151 reads the LED color estimation LED lighting image data obtained in step S207 and the LED color estimation LED extinguishing image data obtained in step S209 from the SDRAM 109 (step S207). S301). Next, the WB correction coefficient calculation unit 151 includes Ron, Gon, Bon, and LED that are average values of R, G, and B data corresponding to the center region of the shooting screen in the LED lighting image data for LED color estimation. In the color estimation LED unlit image data, Roff, Goff, and Boff, which are average values of R, G, and B data corresponding to the center area of the shooting screen, are calculated (step S302).

Next, the WB correction coefficient calculation unit 151 calculates the color change amount Kr (color change amount to red) and Kb (color change amount to blue) of the subject by the LED 114.
Kr = (Roff / Goff) / (Ron / Gon)
Kb = (Boff / Goff) / (Bon / Gon)
(Step S303). That is, Kr is the ratio of the ratio of the red color in the image data obtained when the LED is turned on to the ratio of the red color in the image data obtained when the LED is turned off, and Kb is the image data obtained when the LED is turned on. The ratio of the blue color to the ratio of the blue color in the image data obtained when the LED is turned off.

  Next, the preset WB correction coefficients Pr and Pb stored in the flash memory 116 are read (step S304). Here, Pr and Pb are respectively stored for specific light sources such as sunlight and fluorescent lamps. The white balance of the image data is read by reading the preset WB correction coefficient corresponding to the light source specified by the photographer and multiplying the read preset WB correction coefficient by R and B of the image data captured without causing the LED 114 to emit light. Can be taken.

In the present embodiment, Pb and Pr are corrected using Kr and Kb so that the correct white balance of the image data photographed by causing the LED 114 to emit light can be obtained. That is, the WB correction coefficient calculation unit 151 uses Wr and Wb, which are WB correction coefficients for R and B, used for WB correction of the recording image data in the WB correction processing unit 152, respectively.
Wr = Pr × Kr
Wb = Pb × Kb
(Step S305).

  By using the WB correction coefficient calculated by the series of processes shown in FIG. 3, it is possible to perform WB correction considering the color change of the subject due to the lighting of the LED. In this embodiment, the color change amount of the subject due to the LED lighting is estimated from the LED color estimation LED lighting image data and the LED color estimation LED extinguishing image data taken immediately after the recording image data is shot. . The amount of color change estimated from these image data substantially coincides with the amount of color change of the subject due to the lighting of the LED at the time of shooting the recording image data. Therefore, it is possible to deal with color changes due to individual differences of LEDs 114 and aging degradation.

  Here, the image data for recording obtained in step S206 may be used for the estimation of the color change amount of the subject due to the lighting of the LED instead of the LED lighting image data for estimating the LED color without performing the photographing in step S207. . However, in step S207, the exposure of the image sensor 102 is controlled by the same electronic shutter as in step S209, which is considered more suitable for estimating the amount of color change due to LED lighting.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment of the present invention, similarly to the first embodiment, the block is composed of the blocks shown in FIG. 1, and the processing shown in FIG.

  FIG. 4 is a flowchart showing a WB correction coefficient calculation process in the second embodiment of the present invention. In FIG. 4, the processes denoted by the same step reference numerals as in FIG. 3 are the same as those in FIG. That is, in step S303, the process is the same as in FIG. 3 until the color change amounts Kr and Kb of the subject due to LED lighting are calculated.

  In step S303, after calculating the color change amounts Kr and Kb of the subject due to the lighting of the LED, the WB correction coefficient calculation unit 151 reads out the recording image data obtained in step S206 from the SDRAM 109 (step S404). Then, the WB correction coefficient calculating unit 151 corrects the recording image data by multiplying R of the read recording image data by Kr and multiplying B by Kb (step S405). The image data obtained by this correction corresponds to the image data corrected in the direction to cancel the color change of the subject by the LED 114, that is, the image data when the LED 114 is turned off. Image data obtained by this correction corresponds to the fourth image data.

  Finally, the WB correction coefficient calculation unit 151 calculates WB correction coefficients Wr ′ and Wb ′ for AWB correction from the corrected recording image data (step S406). Using the calculated WB correction coefficient, WB correction is performed on the corrected recording image data, and then other image processing such as color conversion processing and noise reduction processing is performed.

Here, the WB correction coefficient calculated in step S406 is
Wr = Wr ′ × Kr
Wb = Wb ′ × Kb
By correcting the WB correction, the WB correction can be directly performed on the recording image data obtained in step S206.

  The WB correction coefficient calculated by the series of processes shown in FIG. 4 is the WB correction coefficient for AWB calculated using the recorded image data corrected so as to cancel the color change of the subject due to the lighting of the LED. Therefore, individual differences of LEDs 114 and color differences due to aging can be eliminated, and stable WB correction by AWB can always be performed.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the third embodiment of the present invention, similarly to the first embodiment, the block includes the blocks shown in FIG. 1, and the processing shown in FIG.

  FIG. 5 is a flowchart showing a WB correction coefficient calculation process in the third embodiment of the present invention. In FIG. 5, the processes denoted by the same step reference numerals as those in FIG. 3 are the same as those in FIG. That is, in step S303, the process is the same as in FIG. 3 until the color change amounts Kr and Kb of the subject due to LED lighting are calculated.

In step S303, after calculating the color change amounts Kr and Kb of the subject due to the lighting of the LED, the WB correction coefficient calculation unit 151 calculates the AWB for each of R and B from the LED color estimation LED unlit image data read in step S301. WB correction coefficients Ar and Ab are calculated (step S504). Then, the WB correction coefficient calculation unit 151 uses Wr and Wb, which are WB correction coefficients for R and B, used for WB correction of the recording image data,
Wr = Ar × Kr
Wb = Ab × Kb
(Step S505).

  In the processing shown in FIG. 5, the WB correction coefficient for AWB is calculated based on the image that is not affected by the lighting of the LED 114, that is, when the LED 114 is turned off. Therefore, this WB correction coefficient is not affected even if the characteristics of the LED 114 change due to aging or the like. Thereafter, the calculated WB correction coefficient is corrected to a WB correction coefficient that takes into account the color change of the subject by the LED 114, and a WB correction coefficient equivalent to the WB correction coefficient obtained in the second embodiment is calculated. Thus, as in the second embodiment, it is possible to always perform stable WB correction by AWB by eliminating individual differences of LEDs 114 and color differences due to aging, and it is necessary to correct recording image data. Therefore, the processing time can be shortened compared to the second embodiment.

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention.

  Furthermore, the above-described embodiments include various stages of the invention, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some configuration requirements are deleted from all the configuration requirements shown in the embodiment, the above-described problem can be solved, and this configuration requirement is deleted when the above-described effects can be obtained. The configuration can also be extracted as an invention.

1 is a block diagram of a digital still camera as an example of an imaging apparatus according to a first embodiment of the present invention. It is a flowchart which shows the process at the time of imaging | photography concerning the 1st Embodiment of this invention. It is a flowchart which shows the white balance correction coefficient calculation process of 1st Embodiment. It is a flowchart which shows the white balance correction coefficient calculation process of 2nd Embodiment. It is a flowchart which shows the white balance correction coefficient calculation process of 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Lens, 102 ... Imaging device, 103 ... Analog processing part, 104 ... A / D conversion part, 105 ... Bus, 106 ... Image processing part, 107 ... JPEG processing part, 108 ... Microcomputer, 109 ... SDRAM, 110 ... Memory I / F, 111 ... LCD driver, 113 ... LED control unit, 114 ... LED, 115 ... operation unit, 116 ... Flash memory, 117 ... recording medium, 118 ... LCD, 119 ... AE processing unit, 120 ... AF processing unit 151 ... WB correction coefficient calculation unit 152 ... WB correction processing unit

Claims (8)

An imaging unit that captures image data by photographing a subject;
A light emitting diode for illuminating the subject;
A storage unit for storing a white balance correction coefficient corresponding to the specific light source;
A white balance correction unit that corrects the white balance of the image data obtained by the photographing based on the stored white balance correction coefficient;
Comprising
The white balance correction unit corrects the white balance for the first image data obtained by shooting with the light emitting diodes turned on, and the second image obtained by shooting with the light emitting diodes turned on. Corresponding to the stored specific light source based on the color change amount of the subject caused by the lighting of the light emitting diode, which is estimated from the data and the third image data obtained by photographing with the light emitting diode turned off An image pickup apparatus, wherein a white balance correction coefficient to be corrected is corrected, and the white balance is corrected using the corrected white balance correction coefficient. An imaging unit that captures image data by photographing a subject;
A light emitting diode for illuminating the subject;
A white balance correction unit that calculates a white balance correction coefficient from the image data obtained by the photographing, and corrects the white balance of the image data based on the calculated white balance correction coefficient;
Comprising
The white balance correction unit corrects the white balance for the first image data obtained by shooting with the light emitting diodes turned on, and the second image obtained by shooting with the light emitting diodes turned on. Based on the amount of color change of the subject caused by lighting of the light emitting diode and the first image data estimated from the data and third image data obtained by shooting with the light emitting diode turned off. An image pickup apparatus that calculates a white balance correction coefficient and corrects the white balance using the calculated white balance correction coefficient.   The white balance correction unit corrects the white balance for the first image data when the light emitting diode is turned off based on the color change amount of the subject. Correcting to the corresponding fourth image data, calculating a white balance correction coefficient from the fourth image data, and correcting the white balance of the fourth image data using the calculated white balance correction coefficient; The imaging apparatus according to claim 2.   The white balance correction unit corrects the white balance for the first image data when the light emitting diode is turned off based on the color change amount of the subject. The corresponding fourth image data is corrected, a white balance correction coefficient is calculated from the fourth image data, the calculated white balance correction coefficient is corrected based on the color change amount of the subject, and the corrected The imaging apparatus according to claim 2, wherein a white balance of the first image data is corrected using a white balance correction coefficient.   The white balance correction unit calculates a white balance correction coefficient from the third image data and corrects the calculated white balance correction coefficient of the subject when correcting the white balance for the first image data. The imaging apparatus according to claim 2, wherein the imaging apparatus corrects based on a color change amount and corrects the white balance of the first image data using the corrected white balance correction coefficient.   The first image data is image data obtained by photographing using a mechanical shutter, and the second and third image data are image data obtained by photographing using an electronic shutter. The imaging device according to any one of claims 1 to 5.   The imaging apparatus according to claim 1, wherein the second and third image data are image data obtained by photographing immediately after photographing the first image data. .   8. The imaging apparatus according to claim 1, wherein the white balance correction unit corrects the white balance using the first image data as the second image data. 9. .

Images