JP2016181798A - Imaging device and control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of achieving a display image having preferable image quality when an image based on image data obtained by imaging is displayed.SOLUTION: An imaging device includes setting means for setting any mode of plural scene modes, processing means for generating processed image data by performing gamma conversion processing on pickup image data as image data obtained by imaging using a gamma curve corresponding to a scene mode set by the setting means, and display means for displaying an image based on the processed image data on a screen. The pixel value of the pickup image data includes plural gradation values which are different in kind, the gamma curve corresponding to the scene mode corresponds to gamma curves to be applied to plural tone values, and the plural gamma curves corresponding to the scene mode are set so that the hue of an image displayed on a screen is varied to the hue corresponding to the scene mode.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an imaging apparatus and a control method thereof.

  Currently, devices having a liquid crystal panel, which is a display panel using a liquid crystal element (liquid crystal cell) as a display element, are widely used. For example, an imaging device (digital camera) having a liquid crystal panel, a liquid crystal display device which is an image display device having a liquid crystal panel, and the like are widely used.

  A display panel that displays an image for confirmation is required to display an image having excellent image quality such as contrast, color reproducibility, and gradation characteristics. In particular, color reproducibility and gradation characteristics are important. The color reproducibility and gradation characteristics of an image (display image) displayed on the screen of the liquid crystal panel are strongly influenced by the spectral characteristics of a plurality of members including a backlight module, a liquid crystal element, and a color filter.

  The color gamut (color range that can be expressed or reproduced) of a display image is generally determined by three chromaticities corresponding to the three primary colors (red, green, and blue). Specifically, the color gamut of the display image is an area inside the triangle having the above three chromaticities as vertices among the areas in the chromaticity diagram. The NTSC color gamut (target color gamut) is an area inside a triangle whose apexes are the three chromaticities that are standard values of the NTSC system.

  The color gamut of the display image depends on the characteristics of the display panel. For example, the color gamut of the display image depends on the spectral characteristics of the backlight module, the liquid crystal element, and the color filter. Here, since the spectral characteristic of the color filter is mainly determined by the characteristic of the material of the color filter, the user cannot freely select the spectral characteristic of the color filter. Therefore, the color of the image displayed on the screen of the liquid crystal panel is often different from the color desired by the user (target color).

  FIG. 12 is a diagram illustrating an example of the target color gamut and the color gamut of the display image. From FIG. 12, it can be seen that the color gamut of the display image is shifted from the target color gamut. When such a color gamut shift occurs, the saturation degree is 100% (the color of the pixel whose pixel value is the upper limit value), white, skin color, memory color (sky blue, grass green, sunset red, etc.) For all colors such as), it is difficult to make the display color (the color of the display image) match the target color. If the display color of one color is matched with the target color, the display color is shifted from the target color for the other colors. As a result, the image quality (image quality) of the display image is degraded.

  A conventional technique for improving the image quality of a display image is disclosed in Patent Document 1, for example. In the technique disclosed in Patent Document 1, the image quality of the display image is improved by performing image processing for adjusting the brightness according to the shooting information of the imaging apparatus on the image data.

  However, in the technique disclosed in Patent Document 1, only the brightness of image data is changed. For this reason, even if the technique disclosed in Patent Document 1 is used, the above-described shift in display color cannot be reduced, and a display image with sufficiently favorable image quality cannot be obtained.

International Publication No. 2004/008755

  An object of the present invention is to provide a technique capable of obtaining a display image having a suitable image quality when an image based on image data obtained by imaging is displayed.

The first aspect of the present invention is:
Setting means for setting one of a plurality of scene modes respectively corresponding to a plurality of shooting scenes;
Processing means for generating processed image data by performing gamma conversion processing on captured image data, which is image data obtained by imaging, using a gamma curve corresponding to the scene mode set by the setting means;
Display means for displaying an image based on the processed image data on a screen;
Have
The pixel value of the captured image data includes a plurality of gradation values of different types,
The gamma curves according to the scene mode are a plurality of gamma curves respectively applied to the plurality of gradation values,
The plurality of gamma curves according to the scene mode are defined so that the color of the image displayed on the screen changes to the color according to the scene mode.

The second aspect of the present invention is:
A setting step for setting one of a plurality of scene modes respectively corresponding to a plurality of shooting scenes;
A processing step of generating processed image data by performing a gamma conversion process on captured image data, which is image data obtained by imaging, using a gamma curve corresponding to the scene mode set in the setting step;
A display step of displaying an image based on the processed image data on a screen;
Have
The pixel value of the captured image data includes a plurality of gradation values of different types,
The gamma curves according to the scene mode are a plurality of gamma curves respectively applied to the plurality of gradation values,
The plurality of gamma curves according to the scene mode are determined such that the color of the image displayed on the screen changes to the color according to the scene mode. It is.

  According to a third aspect of the present invention, there is provided a program that causes a computer to execute each step of the above-described imaging apparatus control method.

  According to the present invention, it is possible to obtain a display image with suitable image quality when displaying an image based on image data obtained by imaging.

1 is a block diagram illustrating an example of a configuration of an imaging apparatus according to a first embodiment. 6 is a flowchart illustrating an example of a processing flow of the imaging apparatus according to the first embodiment. FIG. 10 is a diagram illustrating an example of a changed gradation range according to the first embodiment. The figure which shows an example of the representative color regarding the beach mode of Example 1, and a target value The figure which shows an example of the gamma curve regarding the beach mode of Example 1. The figure which shows an example of the representative color regarding the scenery mode of Example 1, and a target value The figure which shows an example of the gamma curve regarding the landscape mode of Example 1. The figure which shows an example of the representative color regarding the sunset mode of Example 1, and a target value The figure which shows an example of the gamma curve regarding the sunset mode of Example 1. FIG. 6 is a block diagram illustrating an example of a configuration of an imaging apparatus according to the second embodiment. 10 is a flowchart illustrating an example of a processing flow of the imaging apparatus according to the second embodiment. The figure which shows an example of the color gamut of a target color gamut and a display image

<Example 1>
Hereinafter, an imaging apparatus and a control method thereof according to Embodiment 1 of the present invention will be described.

  First, an example of the configuration of the imaging apparatus according to the present embodiment will be described. FIG. 1 is a block diagram illustrating an example of the configuration of the imaging apparatus according to the present embodiment. As shown in FIG. 1, the imaging apparatus according to the present embodiment includes an imaging unit 101, an analog processing unit 102, a digital processing unit 103, a recording / playback unit 104, a display image data generation unit 105, a display panel 107, and an operation unit 108. , An operation mode setting unit 109, a control microcomputer 110, a scene mode setting unit 111, a memory 112, and the like.

  The control microcomputer 110 is a central processing unit that controls the entire imaging apparatus and performs arithmetic processing. For example, a compressed program is recorded in advance in a flash memory (not shown). The program recorded in the flash memory is decompressed and developed in a program memory (not shown). The control microcomputer 110 operates according to the program developed in the program memory.

  Light passing through a lens (not shown) forms an image on the light receiving surface of the imaging unit 101. The imaging unit 101 is a photoelectric conversion element that converts light imaged on the light receiving surface into an electrical signal (analog signal). In this embodiment, an electrical signal obtained by converting light imaged on the light receiving surface is referred to as “analog imaging data”. The imaging unit 101 outputs analog imaging data to the analog processing unit 102.

  The analog processing unit 102 performs various signal processing on the analog imaging data output from the imaging unit 101 to generate digital imaging data that is a digital signal. Various signal processing performed in the analog processing unit 102 includes AD conversion processing for converting an analog signal into a digital signal. The analog processing unit 102 outputs the digital imaging data to the digital processing unit 103.

  The digital processing unit 103 generates captured image data by performing various signal processing on the digital imaging data output from the analog processing unit 102. In the present embodiment, a processing group from acquisition of analog imaging data to generation of captured image data is referred to as “imaging”. Various signal processing performed in the digital processing unit 103 includes, for example, compression processing for compressing and encoding digital imaging data.

Note that the compression processing method is not particularly limited. For example, one of the following first compression processing and second compression processing is performed as the compression processing. The first compression process is a compression process for compressing and encoding digital image data of a frame for each frame. With the first compression processing, captured image data in a format such as motion JPEG can be generated. The second compression process compresses and encodes digital imaging data of a part of the frames, and generates captured image data based on the data of previous and subsequent frames (digital imaging data or captured image data) for the remaining frames. This is a compression process. The process of generating captured image data based on the data of the previous and subsequent frames includes the process of generating captured image data based on the difference in data between the previous and subsequent frames, and predicting the captured image data from the data of the previous and subsequent frames. Processing to generate, etc. By the second compression processing, captured image data in a format such as MPEG can be generated.

  The recording / playback unit 104 can record captured image data in a recording medium (storage unit) (not shown) (recording process). The recording / reproducing unit 104 can also read captured image data from the recording medium. In other words, the recording / reproducing unit 104 can reproduce the captured image data stored in the recording medium (reproducing process). The recording process and the reproduction process are executed, for example, in response to a user operation or automatically. As the recording medium, a magnetic disk, an optical disk, a semiconductor memory, or the like can be used. The recording medium may be built in the imaging apparatus or may be detachable from the imaging apparatus. The recording process and the reproduction process may be performed by different functional units.

  When reproduction processing is performed (during reproduction), the digital processing unit 103 acquires captured image data to be reproduced from the recording / reproducing unit 104 and outputs the captured image data to be reproduced to the display image data generation unit 105. To do. Thereafter, the processing of the display image data generation unit 105 and the display panel 107 is performed, so that the user can confirm an image based on the captured image data recorded on the recording medium. In other cases, the digital processing unit 103 outputs the generated current captured image data to the display image data generation unit 105. Thereafter, the processing of the display image data generation unit 105 and the display panel 107 is performed, so that the user can confirm an image representing the current state of the subject. That is, the user can use the screen of the imaging apparatus as an electronic viewfinder (EVF). When the recording process is performed, the digital processing unit 103 also outputs the generated current captured image data to the recording / reproducing unit 104. Then, the recording / reproducing unit 104 records the captured image data output from the digital processing unit 103 on a recording medium.

  In the memory 112, a plurality of image quality parameters are recorded in advance. The number and value of the image quality parameters can be changed. As the memory 112, for example, a nonvolatile memory such as an EEPROM can be used.

  The display image data generation unit 105 generates display image data by performing various signal processing on the captured image data output from the digital processing unit 103. Various signal processing performed by the display image data generation unit 105 includes gamma conversion processing. Specifically, the display image data generation unit 105 includes a gamma conversion unit 106. The gamma conversion unit 106 reads any one of the plurality of image quality parameters from the memory 112 and performs gamma conversion processing on the captured image data using a gamma curve corresponding to the read image quality parameters. Thereby, processed image data is generated. The processed image data may be used as display image data, or display image data may be generated by performing other signal processing on the processed image data. By switching the image quality parameter to be used, the image quality of the display image (image displayed on the screen of the imaging apparatus) can be changed. The display image data generation unit 105 outputs the generated display image data to the display panel 107. The control microcomputer 110 can control display / non-display of images. The display image data generation unit 105 outputs display image data to the display panel 107 when the imaging device displays an image, and outputs display image data to the display panel 107 when the imaging device does not display an image. do not do.

  Note that the image quality parameter may be any parameter as long as the gamma curve can be specified. For example, a plurality of gamma curves (functions and tables) may be prepared in advance, and gamma curve identifiers may be used as image quality parameters. A parameter of a function representing a gamma curve may be used as the image quality parameter.

The display panel 107 displays an image corresponding to the display image data (an image based on the processed image data) on the screen. As the display panel 107, an organic EL panel, a liquid crystal panel, a plasma display panel, or the like can be used. The display panel 107 may be an external device of the imaging apparatus, and control for displaying an image on the screen of the display panel 107 may be performed by a functional unit (for example, the control microcomputer 110) included in the imaging apparatus.

  The operation unit 108 receives a user operation on the imaging apparatus and outputs an operation signal corresponding to the user operation to the control microcomputer 110. The control microcomputer 110 performs control according to the operation signal. In the present embodiment, the operation unit 108 has a plurality of operation members (physical buttons). The function assigned to each operation member is appropriately switched according to a user operation for selecting various function icons displayed on the display panel 107. For example, when a menu button is pressed, menu images for various settings are displayed on the screen. The user can intuitively perform various settings using the displayed menu image, up / down / left / right four-way buttons, the SET button, and the like. When the power OFF button is pressed, the image pickup apparatus is turned off.

  The operation unit 108 is not limited to a physical button. For example, a touch panel that can detect a user's contact with the screen may be used as the operation unit 108. The touch panel detection method is not particularly limited. For example, as a detection method, a resistance film method, a capacitance method, a surface acoustic wave method, an infrared method, an electromagnetic induction method, an image recognition method, an optical sensor method, or the like can be used.

  The operation mode setting unit 109 sets one of a plurality of operation modes in the control microcomputer 110. In other words, the operation mode setting unit 109 switches the set operation mode between a plurality of operation modes. For example, the operation mode setting unit 109 sets an operation mode according to a user operation. The plurality of operation modes include, for example, a recording mode that enables execution of recording processing and a playback mode that enables execution of playback processing. The control microcomputer 110 performs control according to the set operation mode. The recording mode includes an auto shooting mode, an auto scene discrimination mode, a manual mode, a program AE mode, a custom mode, and the like.

  The scene mode setting unit 111 sets one of a plurality of scene modes respectively corresponding to a plurality of shooting scenes in the control microcomputer 110. For example, the scene mode setting unit 111 sets a scene mode in accordance with a user operation. The control microcomputer 110 performs control according to the set scene mode. For example, the control microcomputer 110 performs control to change imaging parameters (shutter speed, aperture value, ISO sensitivity, etc.) according to the set scene mode. The scene mode setting method is not limited to the above method. For example, the scene mode may be automatically set according to the usage environment of the imaging apparatus. The use environment of the imaging apparatus can be detected using various sensors, for example.

  The plurality of scene modes include, for example, a portrait mode, a beach mode, a landscape mode, a sunset mode, a snow mode, and the like. The portrait mode corresponds to a shooting scene for shooting a person, the beach mode corresponds to a shooting scene for shooting the sea, and the landscape mode corresponds to a shooting scene for shooting mountains, forests, grasslands, and the like. The sunset mode corresponds to a shooting scene for shooting a sunset, and the snow mode corresponds to a shooting scene for shooting a snow scene. The scene mode is not limited to these six scene modes. The number and type of scene modes are not particularly limited.

  Next, an example of a processing flow of the imaging apparatus according to the present embodiment will be described. FIG. 2 is a flowchart illustrating an example of a processing flow of the imaging apparatus according to the present embodiment. The processing flow in FIG. 2 is started, for example, at a timing when the imaging apparatus is turned on.

  First, the control microcomputer 110 determines whether a recording mode and a scene mode are set (S201). If both the recording mode and the scene mode are set, the process proceeds to S202, and otherwise, the process proceeds to S203.

  In S202, the control microcomputer 110 determines the set scene mode, and notifies the gamma conversion unit 106 of the determination result. Thereby, the gamma curve corresponding to the set scene mode is set as the gamma curve used for the gamma conversion processing. Specifically, the plurality of image quality parameters stored in the memory 112 are associated with a plurality of scene modes, respectively. In S202, an image quality parameter corresponding to the set scene mode is set as an image quality parameter used in the gamma conversion unit 106. Thereafter, the process proceeds to S204.

  In S203, the control microcomputer 110 instructs the gamma conversion unit 106 to set a default value. Thereby, the gamma curve defined as the default curve is set as the gamma curve used for the gamma conversion processing. Specifically, an image quality parameter defined as a default value is set as an image quality parameter used in the gamma conversion unit 106. Thereafter, the process proceeds to S204.

  In this embodiment, the pixel value of the captured image data includes a plurality of gradation values of different types. A plurality of gamma curves respectively applied to a plurality of gradation values are set as gamma curves used for the gamma conversion processing. As will be described in detail later, the plurality of gamma curves corresponding to the scene mode are determined so that the color of the display image changes to the color corresponding to the scene mode.

  After the processing of S202 and S203, various signal processing including at least gamma conversion processing using the set gamma curve is performed on the captured image data, and an image corresponding to the display image data is displayed on the screen.

  In S204, the control microcomputer 110 determines whether or not a user operation for pressing the power OFF button has been performed. If the power OFF button has not been pressed, the process returns to S201. When the power OFF button is pressed, various processes for turning off the image pickup apparatus are performed, and the image pickup apparatus is turned off.

  Next, an example of the correspondence between the scene mode and the gamma curve according to the present embodiment will be described. Hereinafter, an example will be described in which the pixel values of the captured image data are RGB values including an R value corresponding to red, a G value corresponding to green, and a B value corresponding to blue. In this case, in the gamma conversion process, a gamma curve (R curve) applied to the R value, a gamma curve (G curve) applied to the G value, and a gamma curve (B curve) applied to the B value are used.

  The gamma curve described below is merely an example, and the gamma curve corresponding to the scene mode is not limited to the following gamma curve. The correspondence relationship between the scene mode and the gamma curve can change depending on the preference of the user layer, the preference of the manufacturer, the use of the imaging device, and the like. Further, the pixel value is not limited to the RGB value. For example, the pixel value may be a YCbCr value (a combination of a Y value, a Cb value, and a Cr value).

Each scene mode has a color representative of the scene mode (representative color; characteristic color). The representative color is, for example, a color that is highly likely to be included in the subject. Since there is a high possibility that the subject when the portrait mode is set is a person, the representative color in the portrait mode is skin color. Similarly, the representative color of the beach mode is blue, the representative color of the landscape mode is green, the representative color of the sunset mode is red, and the representative color of the snow mode is white. In the present embodiment, a gamma curve determined so that the representative color approaches a predetermined target color among the colors that can be taken by the display image and the color other than the representative color is maintained is used.

  In addition to the gamma conversion process, the process for changing the color of the display image includes an addition process for adding an offset value to each gradation value, a multiplication process for multiplying each gradation value by a gain value, and the like. However, in addition processing and multiplication processing, offset value addition and gain value multiplication are performed over the entire gradation range. For this reason, when the display color that is the representative color matches the target color, the display color other than the representative color is greatly changed from the original display color, and the image quality of the display image is deteriorated. In the gamma conversion process, the display color can be changed only in a part of the gradation range, so that the occurrence of the image quality deterioration can be suppressed.

  FIG. 3 is a diagram illustrating an example of a gradation range (changed gradation range) in which the color balance (balance of R value, G value, and B value) is changed from the default curve in order to bring the representative color closer to the target color. It is. The horizontal axis in FIG. 3 indicates the gradation value (R value, G value, or B value) that is the input value, and the vertical axis in FIG. 3 indicates the display luminance (red, blue, or green) that is the output value. Display luminance). The change gradation range is a range of input values. The display brightness is the brightness on the screen. In FIG. 3, a solid line indicates a default curve, a fine broken line indicates a gamma curve corresponding to the beach mode, and a rough broken line indicates a gamma curve corresponding to the portrait mode. The dotted line indicates a gamma curve corresponding to the landscape mode, and the alternate long and short dash line indicates a gamma curve corresponding to the sunset mode. From FIG. 3, the change gradation range of the beach mode is a range on the high gradation side, the change gradation range of the portrait mode and the landscape mode is a range from the intermediate gradation to the high gradation, and the change gradation range of the sunset mode. It can be seen that the range is from the intermediate gradation to the low gradation. Although not shown in FIG. 3, the changed gradation range of the snow mode is the entire gradation range.

  FIG. 4 is a chromaticity diagram illustrating an example of the color gamut, target color gamut, representative color, and target color of the display image. The representative color and target color in FIG. 4 relate to the beach mode. In FIG. 4, a triangle drawn with a broken line indicates the color gamut of the display image, and a triangle drawn with a solid line indicates the target color gamut. The white square indicates the chromaticity of the representative color, and the white circle indicates the target chromaticity (the chromaticity of the target color). Since it is difficult to match the color gamut of the display image with the target color gamut, in this embodiment, the chromaticity of the representative color is brought close to the target chromaticity.

  FIG. 5 shows an example of an R curve, a G curve, and a B curve corresponding to the beach mode. In FIG. 5, a dotted line indicates an R curve, a fine broken line indicates a G curve, and a coarse broken line indicates a B curve. As shown in FIG. 5, when the beach mode is set, in the changed gradation range on the high gradation side, the luminance of the B curve (blue luminance) is set higher than the default curve, and the G curve The brightness lower than the default curve is set as the brightness. Thereby, the white square of FIG. 4 is brought close to the white circle. In the range other than the changed gradation range, the gamma curve has the same characteristics as the default curve, so that changes in colors other than the representative color can be suppressed.

  FIG. 6 is a chromaticity diagram illustrating an example of a color gamut, a target color gamut, a representative color, and a target color of the representative image. The representative colors and target colors in FIG. 6 relate to the landscape mode. FIG. 7 shows an example of an R curve, a G curve, and a B curve corresponding to the landscape mode. As shown in FIG. 7, when the landscape mode is set, the luminance of the G curve is set higher than the default curve in the changed gradation range from the intermediate gradation to the high gradation, and the luminance of the R curve is set. As a result, a lower brightness than the default curve is set. Thereby, the white square (representative color) in FIG. 6 is brought close to the white circle (target color). Further, in the range other than the changed gradation range, the gamma curve has the same characteristics as the default curve, so that changes in colors other than the representative color can be suppressed.

  FIG. 8 is a chromaticity diagram illustrating an example of a color gamut, a target color gamut, a representative color, and a target color of the representative image. The representative colors and target colors in FIG. 8 relate to the sunset mode. FIG. 9 shows an example of an R curve, a G curve, and a B curve corresponding to the sunset mode. As shown in FIG. 9, when the sunset mode is set, the luminance of the R curve is set higher than the default curve in the changed gradation range from the intermediate gradation to the low gradation, and the G curve A brightness lower than the default curve is set as the brightness. Accordingly, the white square (representative color) in FIG. 8 is brought close to the white circle (target color). In the range other than the changed gradation range, the gamma curve has the same characteristics as the default curve, so that changes in colors other than the representative color can be suppressed.

  As described above, according to the present embodiment, the color of the display image is changed to the color corresponding to the set scene mode by using the gamma curve corresponding to the set scene mode. Thereby, when an image based on the captured image data is displayed, a display image with suitable image quality can be obtained. Specifically, a display image having a suitable color according to the scene mode can be obtained.

<Example 2>
Hereinafter, an imaging apparatus and a control method thereof according to Embodiment 2 of the present invention will be described. In the second embodiment, a configuration and processing capable of obtaining a display image with suitable image quality when reproducing captured image data will be described. In the following, configurations and processes different from those in the first embodiment will be described in detail, and descriptions of the same configurations and processes as those in the first embodiment will be omitted.

  First, an example of the configuration of the imaging apparatus according to the present embodiment will be described. FIG. 10 is a block diagram illustrating an example of the configuration of the imaging apparatus according to the present embodiment. As illustrated in FIG. 10, the imaging apparatus according to the present embodiment includes a digital processing unit 1001 instead of the digital processing unit 103 illustrated in FIG. 1, and includes a recording / reproducing unit 1002 instead of the recording / reproducing unit 104. , A control microcomputer 1003 is provided instead of the control microcomputer 110. In addition, the imaging apparatus according to the present embodiment includes a scene mode determination unit 1004. In FIG. 10, the same reference numerals as those in FIG.

  The digital processing unit 1001 has the same function as the digital processing unit 103. However, when the recording process is performed, the digital processing unit 1001 records and reproduces the captured image data to be recorded and the scene information indicating the scene mode set when the captured image data to be recorded is captured. To 1002. Specifically, the digital processing unit 1001 outputs the generated current captured image data and scene information indicating the set current scene mode to the recording / reproducing unit 104. Similarly to the first embodiment, the generated current captured image data is also output to the display image data generation unit 105.

  The recording / reproducing unit 1002 has the same function as the recording / reproducing unit 104. However, the recording / playback unit 1002 stores the scene information output from the digital processing unit 1001 in the recording medium when the captured image data output from the digital processing unit 1001 is recorded on the recording medium. The scene information output from the digital processing unit 1001 is recorded in association with the captured image data output from the digital processing unit 1001. For example, the scene information is recorded as metadata of captured image data. Further, when reading the captured image data from the recording medium, the recording / reproducing unit 1002 reads scene information associated with the captured image data from the recording medium.

The scene mode determining unit 1004 acquires scene information associated with the captured image data to be reproduced from the recording / reproducing unit 1002 when reproducing the captured image data. Then, the scene mode determination unit 1004 determines the scene mode set at the time of capturing the captured image data to be reproduced based on the acquired scene information. Thereafter, the scene mode determination unit 1004 notifies the control microcomputer 1003 of the determined scene mode.

  The control microcomputer 1003 has the same function as the control microcomputer 110. However, the control microcomputer 1003 notifies the gamma conversion unit 106 of the scene mode notified from the scene mode determination unit 1004 when reproducing the captured image data. As a result, the gamma curve corresponding to the scene mode set when the captured image data to be reproduced is captured is set as the gamma curve used for the gamma conversion process.

  Next, an example of a processing flow of the imaging apparatus according to the present embodiment will be described. FIG. 11 is a flowchart illustrating an example of a processing flow of the imaging apparatus according to the present embodiment.

  First, the control microcomputer 1003 determines whether or not the recording mode is set (S1101). If the recording mode is set, the process proceeds to S1102, and if the playback mode is set, the process proceeds to S1103.

  A processing flow when the recording mode is set will be described. In step S1102, the control microcomputer 1003 determines whether a scene mode is set. When the scene mode is set, the processes of S1105 and S1107 are performed, and when the scene mode is not set, the processes of S1106 and S1107 are performed. In this case, in S1105, S1106, and S1107, the same processes as those in S202, S203, and S204 of the first embodiment (FIG. 2) are performed.

  A processing flow when the playback mode is set will be described. In S1103, the control microcomputer 1003 selects captured image data to be reproduced. The captured image data to be reproduced is selected according to a user operation, for example.

  Next, the control microcomputer 1003 determines whether there is scene information associated with the captured image data to be reproduced (S1104). Whether or not scene information exists can be determined according to whether or not the scene mode is notified from the scene mode determination unit 1004. Specifically, it can be determined that the scene information exists when the scene mode is notified, and it can be determined that the scene information does not exist when the scene mode is not notified. If the scene information exists, the processes of S1105 and S1107 are performed. If the scene information does not exist, the processes of S1106 and S1107 are performed.

  In step S <b> 1105, the control microcomputer 1003 notifies the gamma conversion unit 106 of the scene mode notified from the scene mode determination unit 1004. As a result, the gamma curve corresponding to the scene mode set when the captured image data to be reproduced is captured is set as the gamma curve used for the gamma conversion process. Thereafter, the process proceeds to S1107. Even when the playback mode is set, the processing of S1105 and S1107 is the same as the processing of S203 and S204 of the first embodiment (FIG. 2).

  As described above, according to the present embodiment, when the captured image data is reproduced, the gamma conversion process using the gamma curve corresponding to the scene mode set at the time of capturing the captured image data to be reproduced is performed. As a result, a display image with suitable image quality can be obtained even when the captured image data is reproduced.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

<Other examples>
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

106: Gamma conversion unit 107: Display panel 110: Control microcomputer 111: Scene mode setting unit

Claims (11)

Setting means for setting one of a plurality of scene modes respectively corresponding to a plurality of shooting scenes;
Processing means for generating processed image data by performing gamma conversion processing on captured image data, which is image data obtained by imaging, using a gamma curve corresponding to the scene mode set by the setting means;
Display means for displaying an image based on the processed image data on a screen;
Have
The pixel value of the captured image data includes a plurality of gradation values of different types,
The gamma curves according to the scene mode are a plurality of gamma curves respectively applied to the plurality of gradation values,
The imaging apparatus according to claim 1, wherein the plurality of gamma curves corresponding to the scene mode are determined so that a color of an image displayed on the screen changes to a color corresponding to the scene mode. The plurality of gamma curves corresponding to the scene mode are represented by the representative colors that represent the scene mode among the colors that can be taken by the image displayed on the screen, and the colors other than the representative colors. The imaging apparatus according to claim 1, wherein the imaging apparatus is determined so that the color is maintained. The pixel value is an RGB value including an R value corresponding to red, a G value corresponding to green, and a B value corresponding to blue.
3. The gamma curve according to claim 1, wherein the plurality of gamma curves are a gamma curve applied to the R value, a gamma curve applied to the G value, and a gamma curve applied to the B value. Imaging device. Recording means for recording the captured image data in a storage unit;
Playback means for playing back the captured image data stored in the storage unit;
Further comprising
The processing means performs gamma conversion processing on the captured image data to be reproduced using a gamma curve corresponding to a scene mode set at the time of capturing the captured image data to be reproduced at the time of reproduction by the reproducing means. The image processing apparatus according to claim 1, wherein processed image data is generated by the processing. When recording the captured image data in the storage unit, the recording unit associates scene information indicating a scene mode set at the time of capturing the captured image data to be recorded with the captured image data to be recorded. Recorded in the storage unit,
The imaging apparatus further includes a determination unit that determines a scene mode set at the time of imaging the captured image data to be reproduced based on scene information associated with the captured image data to be reproduced. The imaging device according to claim 4. A setting step for setting one of a plurality of scene modes respectively corresponding to a plurality of shooting scenes;
A processing step of generating processed image data by performing a gamma conversion process on captured image data, which is image data obtained by imaging, using a gamma curve corresponding to the scene mode set in the setting step;
A display step of displaying an image based on the processed image data on a screen;
Have
The pixel value of the captured image data includes a plurality of gradation values of different types,
The gamma curves according to the scene mode are a plurality of gamma curves respectively applied to the plurality of gradation values,
The plurality of gamma curves according to the scene mode are determined such that the color of the image displayed on the screen changes to the color according to the scene mode. . The plurality of gamma curves corresponding to the scene mode are represented by the representative colors that represent the scene mode among the colors that can be taken by the image displayed on the screen, and the colors other than the representative colors. The method according to claim 6, wherein the color is determined so as to be maintained. The pixel value is an RGB value including an R value corresponding to red, a G value corresponding to green, and a B value corresponding to blue.
The plurality of gamma curves are a gamma curve applied to the R value, a gamma curve applied to the G value, and a gamma curve applied to the B value, respectively. Control method of imaging apparatus. A recording step of recording the captured image data in a storage unit;
A reproduction step of reproducing the captured image data stored in the storage unit;
Further comprising
In the processing step, a gamma conversion process is performed on the captured image data to be reproduced using a gamma curve corresponding to a scene mode set at the time of capturing the captured image data to be reproduced at the time of reproduction in the reproduction step. The image processing apparatus control method according to claim 6, wherein the processed image data is generated. In the recording step, when the captured image data is recorded in the storage unit, scene information indicating a scene mode set when the captured image data to be recorded is captured is associated with the captured image data to be recorded. Recorded in the storage unit,
The control method of the imaging apparatus further includes a determination step of determining a scene mode set at the time of imaging the captured image data to be reproduced based on scene information associated with the captured image data to be reproduced. The method for controlling an imaging apparatus according to claim 9.   A program that causes a computer to execute each step of the control method for an imaging apparatus according to any one of claims 6 to 10.

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