JP2015213366A - Imaging apparatus and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve video display in which appropriate correction of white balance is correctly and speedily performed when video is reproduced.SOLUTION: An imaging apparatus image-processes a video signal acquired by photographing in an imaging element 305 and displays video on a display panel 309. A camera image signal processing section 312 includes a white balance processing section 109 which performs white balance control for photographing and performs processing so that a white balance state of the video becomes appropriate. A display video signal switching section 115 switches a video signal to which white balance correction is not performed yet by the white balance processing section 109 and a video signal to which the white balance correction is performed by the white balance processing section 109 as the video signal inputted to the display panel 309.

Description

  The present invention relates to white balance correction of an image displayed on display means in underwater shooting.

In recent years, a video camera is provided with a display unit such as a liquid crystal panel for monitoring a subject image. This type of digital camera or video camera can be taken underwater by mounting the main body in a waterproof dedicated housing.
By the way, in the case of underwater photographing using an imaging device provided with a display unit, it is known that the red component attenuates as the water depth increases, and thus the photographed subject image is bluish. For this reason, when viewing the image with white balance correction so that it is correct white at the time of shooting on the display, the surrounding ambient light is bluish, and the human brain adapts to the surrounding blue ambient light For this reason, the video on the display section appears reddish. That is, in the imaging apparatus, the white balance correction of the display image is performed by a preset correction value, which is independent of the white balance correction for the camera image at the time of shooting and the surrounding ambient light. Since human vision adapts to the shooting environment, if a camera image that has undergone white balance correction is displayed on the display panel as it is, the user may feel uncomfortable. In other words, in underwater shooting, a signal that is corrected to the original color by adding a red component by white balance correction is recorded, and when this is played back and displayed on the display panel, the image is red to the user's eyes. Appears to taste. For this reason, the user may have an illusion that a reddish video has been recorded.
In order to avoid this, when shooting underwater with a digital camera or video camera, a color chart is displayed on the display unit, allowing the user to specify what looks white, and white balance of the displayed video based on the specified color Has been proposed (see Patent Document 1). In addition, an imaging device that can reduce the difference between the white balance of the camera image and the white balance of the display image caused by the lighting environment at the time of shooting and can accurately grasp the white balance state of the image being shot by the user is proposed (See Patent Document 2).

JP 2006-197478 A Japanese Patent Laid-Open No. 2008-212333

In the prior art, there is a problem that the user cannot confirm an image with appropriate white balance correction on the display screen during underwater shooting or it takes a processing time. In the technique disclosed in Patent Document 1, since it is necessary to present and select a color chart set in advance in white balance adjustment of a display image, the time required until a correct adjustment state is obtained. It was over.
SUMMARY OF THE INVENTION An object of the present invention is to provide an imaging apparatus capable of displaying an image that has been subjected to appropriate white balance correction accurately and quickly at the time of image reproduction, and a control method therefor.

  In order to solve the above-described problems, an apparatus according to the present invention is an imaging apparatus that performs image processing on a video signal acquired by imaging by an imaging unit and displays the image on a display unit, and performs white balance on the video signal. A signal processing unit that performs correction, a video signal that is not subjected to white balance correction by the signal processing unit, and a video signal that is subjected to white balance correction by the signal processing unit as a video signal input to the display unit Signal switching means for switching the video signal.

  According to the present invention, it is possible to display an image on which an appropriate white balance correction has been made accurately and quickly at the time of image reproduction.

FIG. 2 is a block diagram illustrating a configuration example of an imaging device in order to explain a first embodiment related to the present invention together with FIGS. It is a graph which illustrates the gain control amount of blue and red in white balance control. It is a flowchart which shows the example of a white balance correction process. FIG. 7 is a perspective view showing an example of the appearance of an imaging apparatus in order to explain a second embodiment related to the present invention together with FIGS. 5 and 6. It is a block diagram which shows the structural example of an imaging device. It is a flowchart which shows the example of a white balance correction process. FIG. 9 is a block diagram illustrating a configuration example of an imaging apparatus in order to describe the third embodiment of the present invention together with FIG. 8. It is a flowchart which illustrates the operation | movement procedure of an imaging device. 14 is a flowchart illustrating an operation procedure of an imaging apparatus according to a modification of the third embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each embodiment, a video camera capable of underwater photography will be described. However, the present invention can be applied to various imaging devices such as a digital still camera as long as video signals can be recorded and reproduced.

(First embodiment)
FIG. 1 is a block diagram showing a configuration example of a video camera according to the first embodiment related to the configuration of the imaging apparatus of the present invention.
The imaging optical system includes a lens 301 (including a focus lens, a camera shake correction lens, and the like), a diaphragm 302, and an imaging element 305. A diaphragm 302 is disposed behind the lens 301, and light passing through these is formed as a subject image on the imaging surface of the image sensor 305. An image sensor used for the image sensor 305 converts a subject image from an optical signal to a video signal. The video signal obtained by the imaging device 305 is sent to the camera image signal processing unit 312 and subjected to predetermined processing, and is output to the external display device 316 or recorded in the built-in memory 315 or the memory card 318. The Note that the type of recording medium to be used does not matter.
The system control unit 311 controls accumulation and reading of the image sensor 305 via the imaging control unit 306. The system control unit 311 performs focus control and zoom control of the lens 301 via the lens control unit 303. In addition, the system control unit 311 controls exposure by controlling the aperture 302 and the shutter speed via the aperture control unit 304 using the luminance information of the subject obtained from the image data obtained from the image sensor 305. I do.

A mode selection unit 401 is used when the user selects an underwater shooting mode or a playback mode. A white balance (hereinafter also referred to as WB) is set in accordance with the selected mode. Information on the set WB mode is sent to the system control unit 311. The system control unit 311 performs WB control for shooting through the camera image signal processing unit 312 and performs processing so that the WB state of the video is appropriate. In the method of dividing the video display screen as one of the WB controls, a color is detected for each divided area to determine an appropriate value of WB, and the WB correction value of the entire screen becomes an appropriate value based on the average value. It is processed. WB detection is performed by dividing the video screen into 9 or 6 divisions, but other screen division numbers may be used.
In the camera image signal processing unit 312, the system control unit 311 obtains ambient color temperature information by color coordinate conversion of the camera image, and sends it to the display image signal processing unit 308. At the time of video playback, the image data recorded in the built-in memory 315 or the memory card 318 is sent to the playback image signal processing unit 314, and color temperature information obtained by color coordinate conversion of the playback video is sent to the display image signal processing unit 308. The display image signal processing unit 308 performs WB correction according to surrounding color temperature information obtained by color coordinate conversion of the camera image and color temperature information obtained by color coordinate conversion of the reproduced image. Thereby, the WB state of the display panel 309 of the imaging apparatus becomes appropriate. As the display panel 309, for example, a liquid crystal panel (LCD) is used, but not limited to this, various display devices can be used.

FIG. 2 is a graph illustrating gain control amounts for R (red) and B (blue) in the WB control of this embodiment. The horizontal axis represents the R gain amount, and the vertical axis represents the B gain amount.
The WB correction of the present embodiment is performed by fixing G among the three primary color signals of R, G (green), and B, and changing the correction amounts of the R and B gains. In FIG. 2, the graph curve indicated by the solid line portion 201 indicates the variable range of the WB correction amount along the black body radiation when the WB correction is not performed in the underwater reproduction mode. A point 203 exemplifies a control point located on the graph curve indicated by the solid line portion 201. Underwater, since the red component attenuates as the water depth increases, for example, with the WB correction amount according to the graph line of the solid line portion 201, the color temperature is 3000K (Kelvin), and the gain amount of B is high. When the amount of gain is low, the image is bluish. Therefore, in the underwater shooting mode, WB correction is performed along the graph line indicated by the dotted line 202 as the water depth increases. The point 204 exemplifies a control point located on the graph line indicated by the dotted line 202, and corresponds to a case where the water depth is 5 m, for example. By the WB correction in the underwater shooting mode, the color temperature becomes 10000K, and the WB correction is performed to decrease the B gain amount and increase the R gain amount. In contrast to the WB correction at the point 204, the R gain amount is increased on the screen of the display panel 309, so that the image appears reddish to the user's eyes. An arrow 300 indicated by a solid line represents a direction when the WB correction of the display panel 309 is controlled in the reverse direction based on the WB information at the point 204. In the WB correction of the display panel 309, the WB state of the display image is changed to a position shifted with respect to the curve along the black body radiation so that the WB state of the display image is viewed with the eyes of the user who has adapted to the surrounding environment (water). Appropriate. Note that the WB correction of the display panel 309 may vary depending on the characteristics of the device used (for example, spectral characteristics of a liquid crystal panel, a backlight, etc.), and thus the arrow 300 is an example.

FIG. 3 is a flowchart illustrating the flow of WB correction processing in the present embodiment.
When the image pickup apparatus is powered on, the system control unit 311 receives a signal from the mode selection unit 401 and determines whether or not the current setting mode is the underwater shooting mode (S10). If the current setting mode is the underwater shooting mode, the process proceeds to S11. If the current setting mode is not the underwater shooting mode, the process ends.
The system control unit 311 determines whether or not the current setting mode is the playback mode (S11). If the current setting mode is not the playback mode, the process proceeds to S16. If the current setting mode is the playback mode, the process proceeds to a determination process (S12) as to whether or not the display panel 309 is on. If the display panel 309 is on and is lit, color temperature information is acquired by color coordinate conversion of the reproduced video (S13). Then, when viewed with the eyes of the user who has adapted to the surrounding environment (underwater), the camera image signal processing unit 312 performs color coordinate conversion of the camera image so that the WB of the display image is appropriate. Ambient color temperature information is acquired (S14). The display image signal processing unit 308 performs WB correction on the display panel 309 as described with reference to FIG. 2 based on the color temperature information acquired in S13 and the color temperature information acquired in S14 (S15). Since the WB correction of the display panel 309 is canceled by the visual chromatic adaptation effect, the user can view the reproduced video in an appropriate WB state. Then, the process proceeds to S16.
If the display panel 309 is off and is not lit in S12, the display panel 309 is not subjected to WB correction processing, and the process proceeds to S16. It is determined whether or not the reproduction has ended, and while the reproduction has not ended, the process returns to S10 and the process is repeated. Further, in the case of the end of reproduction, the above-described series of processing ends.
According to the first embodiment, when video playback is performed in order to check the shooting content in the underwater shooting mode, the WB correction of the display panel 309 is performed using the white balance correction value in the camera image signal processing unit 312. . As a result, the reproduced video with the red component reduced can be displayed accurately and quickly on the display panel 309.

(Second Embodiment)
Next, a second embodiment related to the configuration of the imaging apparatus of the present invention will be described. In the following, differences from the first embodiment will be mainly described, and the same components as those in the first embodiment will be omitted by using the same reference numerals already used. Such omission is the same in other embodiments described later.
FIG. 4 is a perspective view illustrating an appearance example of the imaging apparatus according to the second embodiment. Hereinafter, the subject side will be described as the front side and the front side of the apparatus.
A recording medium such as a built-in memory or a memory card is accommodated in the main body 320 of the imaging apparatus, and is configured to be able to record and reproduce moving image data and still image data.
A lens portion 321 is provided on the front surface of the main body 320, and a microphone 322 is attached to the upper portion in order to record sound during shooting. A display panel 309 for displaying a playback image is supported on the side surface of the main body 320 so as to be openable and closable, and a viewfinder 310 is provided on the rear surface of the main body 320. The first switching detection unit 501 has a switch that detects the open / closed state of the display panel 309. When the display panel 309 is accommodated in the main body 320, the display panel 309 is turned off and the light source in the viewfinder 310 is turned on, so that the user can check the playback display while looking through the viewfinder 310. Further, when a switch for detecting that the user has pulled out the viewfinder 310 is provided, when the drawer is detected, the display panel 309 is turned on, and the viewfinder 310 is also turned on. As a result, the user can confirm the playback display in either case. The second switching detection unit 502 detects that the display surface of the display panel 309 is in an inverted state in which the display surface faces in a direction different from the side surface side of the main body 320. When the inversion state is detected, both the display panel 309 and the viewfinder 310 are lit, so that the user can check the reproduction display.

  The mode selection unit 401 has a rotary switch provided on the side surface of the main body 320. The user can select a “playback” position for setting the playback mode, an “underwater” position for setting the underwater shooting mode, and the like by operating the mode selection unit 401. The operation switch unit 327 includes various keys used by the user to operate the main body 320, for example, keys for menu operation, reproduction operation, and the like. The speaker 329 located below the audio output when reproducing the video signal. The battery 330 is detachably provided from the back surface of the main body 320, and supplies power to each unit in the imaging apparatus.

FIG. 5 is a block diagram illustrating a configuration example of a video camera according to the second embodiment. Hereinafter, differences from the configuration shown in FIG. 1 will be described.
The system control unit 311 corrects camera shake during shooting by the user by driving the lens 301 through the lens control unit 303 or by controlling the camera image signal processing unit 312. The detection signals of the first switching detection unit 501 and the second switching detection unit 502 are sent to the system control unit 311. When the display panel 309 is in a lighting state, WB correction is performed based on the surrounding color temperature information obtained from the camera image by the camera image signal processing unit 312 and the color temperature information of the reproduced image by the reproduction image signal processing unit 314. Further, when the light source of the viewfinder 310 is in a lighting state, WB correction of the video displayed on the viewfinder 310 is performed using predetermined setting information. A display image signal processing unit 408 processes the reproduction signal from the reproduction image signal processing unit 314 and outputs it to the viewfinder 310 to display an image.

FIG. 6 is a flowchart for explaining the WB control of the viewfinder 310 in the second embodiment.
When the imaging apparatus is powered on, the system control unit 311 determines whether the current setting mode is the underwater shooting mode based on a signal from the mode selection unit 401 (S20). If the current mode is the underwater shooting mode, the process proceeds to S21. If the current mode is not the underwater shooting mode, the process ends.

Next, it is determined whether or not the current setting mode is the playback mode (S21). If the current setting mode is not the playback mode, the process proceeds to S24. Also. If the current setting mode is the playback mode, the process proceeds to S22. In S22, the system control unit 311 receives signals from the first switching detection unit 501 and the second switching detection unit 502, and determines whether the viewfinder 310 is in an on state, that is, whether the light source is on. judge. If the viewfinder 310 is in the lit state, the process proceeds to S23. If the viewfinder 310 is in the off state and the light is extinguished, the process proceeds to S24.
The display image signal processing unit 408 performs WB correction according to a predetermined color temperature setting (S23). At this time, if the display panel 309 is in the lighting state, the process is executed according to the flowchart described in FIG.

After the above processing is performed, it is determined whether or not the reproduction is finished (S24). When the reproduction is finished, the above-described series of processing is finished. When the reproduction is continued, the process returns to S20 and the above process is repeatedly executed. When the power is turned off, the process is terminated.
According to the second embodiment, when switching to the viewfinder 310 is detected, the display image signal processing unit 408 performs WB correction using color temperature information determined in advance for the display image of the viewfinder 310. Done. Therefore, the user can check the captured video in an appropriate WB state.

(Third embodiment)
FIG. 7 is a block diagram illustrating a configuration example of an imaging apparatus according to the third embodiment of the present invention.
A CPU (central processing unit) (not shown) constituting the system control unit 311 controls each unit by interpreting and executing the control program. In addition, the system control unit 311 controls the camera shake correction at the time of shooting of the user by driving the lens 301 via the lens control unit 303 or by controlling a camera image signal processing unit 312 described later. A mode selection unit 401 is used when the user sets a shooting mode or a WB mode described later.

  The video signal obtained by the image sensor 305 is sent to a camera image signal processing unit 312 and a display video signal switching unit 115 described later. The camera image signal processing unit 312 includes a WB processing unit 109, a color correction processing unit 110, a gamma processing unit 111, and an outline enhancement processing unit 112. The WB processing unit 109 performs WB control for shooting according to the WB mode information set by the user, and performs processing so that the WB state of the video is appropriate. The gamma processing unit 111 changes input / output characteristics according to the level of light and darkness in the screen. The contour enhancement processing unit 112 extracts a high-frequency component of the video signal, adds the gain to the original video after increasing the gain, and thereby enhances the contour. The color correction processing unit 110 also improves color reproducibility and corrects chromatic aberration. The video signal that has undergone predetermined processing by the camera image signal processing unit 312 is sent to the recording signal processing unit 114 and subjected to compression / decompression processing. As a compression / decompression processing method, for example, there is a moving image coding method in which each frame is compression-coded independently, such as Motion JPEG. Alternatively, as in MPEG, a moving image encoding method may be used in which compression encoding is performed independently for each frame, and the difference between preceding and subsequent frames is taken, or compression encoding is performed by predicting from a plurality of frames. JPEG is an abbreviation for “Joint Photographic Experts Group”, and MPEG is an abbreviation for “Moving Picture Experts Group”.

The output of the recording signal processing unit 114 is sent to the display video signal switching unit 115 or recorded on the recording medium 118. The recording medium 118 for storing still image data, moving image data, and the like is composed of a magnetic recording medium, a magneto-optical recording medium, a semiconductor memory, or the like, and various media that can be randomly accessed can be used.
The display video signal switching unit 115 is a signal before being subjected to WB processing by the WB processing unit 109 (see video signal path B) as a display video signal to be sent to the display image signal processing unit 308, or WB by the WB processing unit 109. The signal after the processing (see video signal path A) is switched. The display video signal selected here is subjected to predetermined processing in the display image signal processing unit 308 and then output to the display panel 309. FIG. 4 is a perspective view showing an example of the appearance of the imaging apparatus according to the present embodiment. Below, only the component relevant to this embodiment is demonstrated.

The electronic viewfinder 310 is used for capturing and confirming a subject at the time of shooting by looking into the user. The moving image trigger switch 206 is a push button, and is operated by the user to instruct the apparatus to start and end moving image shooting. The mode selection unit 401 includes a mode dial, and the user can select a setting position such as a reproduction mode, a camera mode, an underwater shooting mode, and an OFF position. The operation switch unit 208 is provided in the vicinity of the display panel 309. In order to operate the main body 320 by the user, a key for performing setting input for the WB mode, a key for selecting a shooting scene mode (person, fireworks, underwater, etc.), other menu operations, reproduction operations, and the like. Consists of keys to do.
The display panel 309 is used in a state where it is opened from the side surface of the main body 320, and can also be rotated in the horizontal direction.

Next, switching control of the video signal paths A and B in FIG. 7 will be described for the display video signal to be sent to the display panel 309.
FIG. 8 is a flowchart illustrating the procedure for switching the display video signal. The following processing is executed according to instructions from the system control unit 311.
When the imaging apparatus is powered on, the system control unit 311 determines whether the current setting mode is a camera (shooting) mode or a playback mode (S301). In the case of the camera mode, the process proceeds to S302, and in the case of the playback mode, the process proceeds to S304.
In the case of the camera mode, it is determined whether or not the set mode is the underwater shooting mode (S302). In underwater shooting, the red component of the captured video is attenuated, so in the camera image, WB correction is performed in advance so as to increase red. For this reason, an image displayed on the display panel 309 such as an LCD becomes a reddish image due to the visual adaptation effect of the user. Therefore, if the setting mode is the underwater shooting mode, the process proceeds to S303. The display video signal switching unit 115 switches the display video signal to be sent to the display panel 309 to a video signal before the WB processing unit 109 performs WB processing (see video signal path B in FIG. 7). On the other hand, if the setting mode is not the underwater shooting mode, the process proceeds to S304. The display video signal switching unit 115 switches the display video signal to be sent to the display panel 309 to the video signal after the WB processing unit 109 performs the WB process (see video signal path A in FIG. 7).

After the processing in S303 and S304, the process proceeds to S305, and the system control unit 311 determines whether to continue shooting. When continuing, the process returns to S301, and the above processing is repeated until the power is cut off and the control is completed. At the end of shooting, the series of processes described above ends.
According to the third embodiment, the display video signal to be sent to the display panel 309 in the underwater shooting mode is switched to the video signal before the WB processing is performed, so that the WB processing related to the image signal captured in the underwater environment is performed. An image in which the red component is enhanced is not displayed on the display panel 309. For this reason, even in human vision adapted to the underwater environment, video display in an appropriate WB state is performed on the display panel 309. That is, it is possible to reduce the WB difference between the camera image (captured image) and the display panel image (display image) that occurs in an underwater environment. And the user can grasp | ascertain correctly the WB state of a picked-up image.
In the third embodiment, when the user looks into the viewfinder 310, it is not affected by the surrounding lighting environment. Therefore, the display video signal to be sent to the viewfinder 310 may remain the video signal path A (see FIG. 7) using the video signal after the WB processing unit 109 performs the WB process.

(Modification)
Next, a modification of the third embodiment of the present invention will be described.
The mode selection unit 401 shown in FIG. 7 can select the following WB mode.
・ Auto white balance mode (AWB)
In this mode, automatic correction is performed based on image data of a subject or information of a color temperature sensor to obtain an appropriate WB state.
・ White balance set mode (WB set)
This is a mode in which the WB is corrected so that the reference white becomes an appropriate white when the user operates in advance while photographing a reference white subject in the shooting environment.
・ White balance preset mode (WB preset)
In this mode, a correction value for obtaining an appropriate WB is prepared in a plurality of environments assumed in advance, such as preset indoors and preset outdoor, and the user selects a correction value.
The WB mode instruction signal set by the user operating the WB mode selection unit included in the mode selection unit 401 is output to the system control unit 311.

FIG. 9 is a flowchart illustrating a procedure for switching display video signals to be sent to the display panel 309. Since the process of S501 is the same as S301 in FIG. 8 and the process of S506 to 508 is the same as S303 to 305 of FIG. 8, the process of S502 to S505 will be mainly described below.
When the process proceeds from S501 to S502 (in the case of YES), the setting content of the WB mode is determined. The system control unit 311 determines which of the WB set, AWB, and WB preset is described above. In the case of the WB set, the WB processing unit 109 corrects the WB so that the reference white becomes an appropriate white (S503). In AWB, an appropriate WB state is obtained by automatic correction based on image data of a subject or information of a color temperature sensor (504). In the WB preset, the user selects a correction value prepared in order to obtain an appropriate WB state under a plurality of environments assumed in advance (505). In the WB set (S503) and AWB (S504), the video displayed on the display panel 309 needs to be displayed in an appropriate WB state as with the captured video. In the case of the WB set or AWB, the process proceeds to S506 in order to view the video in the proper WB state even when the display image on the display panel 309 is viewed by the user's eyes adapted to the surrounding lighting environment. The display video signal switching unit 113 switches to a video signal before performing the WB process as a display video signal to be sent to the display panel 309 (see video signal path B in FIG. 7).

On the other hand, in the WB preset (S505), correction values are prepared so that an appropriate WB state is obtained under an environment assumed in advance. However, there are cases where the user intentionally uses a correction value that is different from the environment at the time of use (for example, when the user wants to take the sunset more red). Therefore, in the case of the WB preset, the process proceeds to S507. The display video signal switching unit 113 switches to the video signal after the WB processing is performed as the display video signal to be sent to the display panel 309 (see video signal path A in FIG. 7).
According to the modification, in the case of an AWB or WB set in which the white portion of the video is required to be appropriate white, the path is switched to the path B that uses the video signal before the WB processing is performed. For this reason, since the WB difference between the camera image and the display panel image caused by the lighting environment at the time of shooting can be reduced, the user can accurately grasp the WB state of the video being shot. In the case of the WB preset, the user may intentionally change the WB correction amount. Therefore, by switching to the video signal path A that uses the video signal after the WB processing is performed, the user can The change of the correction amount can be confirmed.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

109 White Balance Processing Unit 115 Display Video Signal Switching Unit 305 Image Sensor 308 Display Image Signal Processing Unit 309 Display Panel 310 Viewfinder 312 Camera Signal Processing Unit 314 Playback Image Signal Processing Unit 315 Built-in Memory 318 Memory Card 401 Mode Selection Unit 501, 502 Switching detector

Claims (7)

An image pickup apparatus that performs image processing on a video signal acquired by shooting by an image pickup means and displays the image on a display means,
Signal processing means for performing white balance correction on the video signal;
As a video signal input to the display means, a signal switching means for switching a video signal before white balance correction is performed by the signal processing means and a video signal after white balance correction is performed by the signal processing means; An imaging apparatus comprising: The imaging means can shoot underwater,
2. The imaging according to claim 1, wherein the signal processing unit performs white balance correction corresponding to attenuation of light in water on a video signal acquired by photographing in water by the imaging unit. apparatus.   The imaging apparatus according to claim 2, wherein the signal processing unit performs white balance correction so as to enhance a red color of an image. When shooting underwater,
The imaging apparatus according to claim 2 or 3, wherein the signal switching unit switches the video signal input to the display unit to a video signal before white balance correction is performed by the signal processing unit. Further comprising mode selection means,
When the underwater shooting mode is selected by the mode selection unit and the display unit is on, the signal switching unit performs white balance correction by the signal processing unit as a video signal to be input to the display unit. 4. The image pickup apparatus according to claim 2, wherein the image signal is switched to a video signal before being transmitted.   The imaging apparatus according to claim 1, wherein the signal switching unit switches a video signal according to a surrounding environment of the imaging apparatus. A control method executed by an imaging apparatus that performs image processing on a video signal acquired by imaging by an imaging unit and displays the image on a display unit,
As a video signal input to the display means, there is a signal switching step for switching between a video signal before white balance correction by the signal processing means and a video signal after white balance correction by the signal processing means. And a method of controlling the imaging apparatus.

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