JP2016154360A - Imaging apparatus and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus and its control method that are capable of creating an image file from which an image having a correct subject shape can be reproduced in two-dimensional display and stereoscopic display.SOLUTION: An imaging element 505 includes a plurality of photoelectric conversion units that perform photoelectric conversion on light beams individually having passed through different regions in an exit pupil of an imaging optical system to output a plurality of image signals. An image combination processing circuit 513 acquires respective data on a left-eye image and right-eye image from an image signal output by the imaging element 505, and generates combined image data for two-dimensional display by performing addition combination on the left-eye image and right-eye image. A parallax map generation circuit 514 generates parallax map data from the data on the left-eye image and right-eye image. A recording medium control I/F unit 510 performs control of generating an image file including the combined image data generated by the image combination processing circuit 513 and the parallax map data generated by the parallax map generation circuit 514 in different regions inside to record the image file in a recording medium 511.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an imaging apparatus, and more particularly to recording processing of an image file including image data for stereoscopic display (hereinafter also referred to as 3D display) and two-dimensional display (hereinafter also referred to as 2D display).

  In recent years, three-dimensional (3D) cinema, 3D display, and other 3D video related devices are rapidly spreading. Although stereoscopic video shooting has been conventionally performed with a film camera or the like, with the widespread use of digital imaging devices, original images for generating stereoscopic video with a digital camera, a digital video camera, and the like have been captured. ing.

As a mechanism for a user to view a stereoscopic video, right eye image data and left eye image data with parallax in the left-right direction so as to correspond to an image of an object viewed with the left eye and an image viewed with the right eye are provided. Be prepared. A user can view each image stereoscopically by looking at the right eye and the left eye. As such a method, there is a method of dividing an image to be viewed, such as a parallax barrier method or a lenticular method, into a parallax. There is also known a method for presenting different images to the left and right eyes of the user through filters having different characteristics on the left and right.
Patent Documents 1 and 2 disclose a method of simultaneously capturing images from different viewpoints as a method of capturing an image that can be viewed as a stereoscopic video.

  Patent Document 1 discloses a solid-state imaging device in which a plurality of microlenses are formed, and one or more pairs of photodiodes are arranged in proximity to each of the microlenses. A first image signal is obtained from the output of one of the photodiode pairs, and a second image signal is obtained from the output of the other photodiode. By using the first and second image signals as the left-eye image signal and the right-eye image signal, respectively, the user can view a stereoscopic video.

  Patent Document 2 discloses an output parallax map having an output element having an output value corresponding to a shift to be applied to each pixel of the first image. A second image can be generated based on the output parallax map and the first image. This calculation is based on an input parallax map with each input element having an input value, and a second image can be generated using the input image and the parallax map to render a multi-view image.

JP-A-58-24105 Special table 2008-518317

In order to view an image as a three-dimensional video, as described above, it is necessary to view an image with parallax in the left-right direction with the corresponding user's eyes. Therefore, in either method, a left-eye image for viewing with the left eye and a right-eye image for viewing with the right eye are necessary.
As disclosed in Patent Document 1, when a plurality of microlenses are formed and imaged using a solid-state imaging device in which one or more pairs of photodiodes are arranged in proximity to each of the microlenses, There are the following problems. One of the paired photodiodes outputs a left-eye image signal obtained by photoelectrically converting the light beam that has passed through the region where the exit pupil of the imaging optical system is located, and the other photo-electrical light beam that has passed through a region different from the region of the exit pupil. Assume that the converted right-eye image signal is output. In this case, depending on the subject, both the left-eye image and the right-eye image may not be images reflecting the shape of the subject.

For example, in a shooting scene in which light from a point light source is shot in a blurred manner, a photograph of a light source that is blurred in a circular shape should be originally taken. However, when the image is captured by the solid-state imaging device disclosed in Patent Document 1, the captured image has a shape such as a semicircle or an ellipse that does not reflect the shape of the subject. For example, the subject in the left-eye image is missing the left half, and the subject in the right-eye image is missing the right half. Taken. This is because, among the light fluxes emitted from the exit pupil of the imaging optical system, the regions of the light received by the photodiodes differ from the optical axis.
In such a case, even if an attempt is made to obtain the second image by calculation using the technique disclosed in Patent Document 2, an image of the correct subject shape cannot be obtained. That is, since the original image is captured in a shape different from the actual subject, the second image obtained by calculation cannot be reproduced as a correct image.

When using a parallax map, it is necessary to create an image file in accordance with a compatible file format so that it can be handled by a general application. When files containing parallax map data and files containing image data are created separately, it is necessary to manage multiple files, so it is desirable to include both data in a single file in consideration of user convenience .
Accordingly, an object of the present invention is to provide an imaging apparatus capable of creating an image file capable of reproducing an image of a correct subject shape in two-dimensional display and stereoscopic display, and a control method thereof.

  In order to solve the above problems, an apparatus according to the present invention includes an image sensor having a plurality of photoelectric conversion units that photoelectrically convert light beams that have passed through different areas of an exit pupil of an imaging optical system and output a plurality of image signals. An image pickup apparatus that processes a plurality of image signals by the image pickup device and records the processed image signals on a recording medium, and acquires each data of a left eye image and a right eye image from an image signal output from the image pickup device, Image synthesis means for generating composite image data for two-dimensional display by addition synthesis related to the image for right and the image for right eye, and parallax map generation means for generating parallax map data from the data of the image for left eye and the image for right eye, Create image files that contain the combined image data generated by the image combining means and the disparity map data generated by the disparity map generating means in different regions. A recording control means for performing control of recording on the recording medium.

  According to the present invention, it is possible to create an image file that can reproduce an image of a correct subject shape in two-dimensional display and stereoscopic display.

1 is a diagram schematically showing an overall configuration of an image sensor according to an embodiment of the present invention. It is a figure which shows the structural example of the pixel of an image pick-up element. It is the conceptual diagram showing a mode that the light from the area | region where the exit pupil of a photographing lens enters into an image pick-up element. It is a figure which shows the structural example of the imaging device which concerns on embodiment of this invention. It is a figure which shows the production | generation process example of a parallax map. It is a figure which shows a parallax map typically. FIG. 11 is a diagram schematically showing an example of a file structure in order to explain the first embodiment of the present invention in conjunction with FIGS. It is a flowchart explaining an imaging sequence example. It is a flowchart explaining the example of a file creation process. It is a flowchart explaining the example of a parallax map production | generation process. It is a figure which shows typically the file structure example in 2nd Embodiment. It is a flowchart explaining the example of a parallax map generation process in 2nd Embodiment. It is a figure which shows the example of a file structure in 3rd Embodiment typically. It is a flowchart explaining the example of a parallax map generation process in 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically illustrating a configuration example of an imaging element applied to an imaging apparatus according to an embodiment of the present invention. The image sensor 100 includes a pixel array 101, a vertical selection circuit 102 that selects a row in the pixel array 101, and a horizontal selection circuit 104 that selects a column in the pixel array 101. The readout circuit 103 reads out the signal of the pixel selected by the vertical selection circuit 102 among the pixels in the pixel array 101. The reading circuit 103 includes a memory for accumulating signals, a gain amplifier, an AD converter, and the like for each column.

  The serial interface (SI) unit 105 determines an operation mode of each circuit according to an instruction from an external circuit. The vertical selection circuit 102 sequentially selects a plurality of rows in the pixel array 101 and extracts pixel signals to the readout circuit 103. The horizontal selection circuit 104 sequentially selects a plurality of pixel signals read by the reading circuit 103 for each column. In addition to the components shown in FIG. 1, the image sensor 100 includes, for example, a timing generator that provides a timing signal to the vertical selection circuit 102, the horizontal selection circuit 104, the readout circuit 103, a control circuit, and the like. These detailed explanations are omitted.

  FIG. 2 is a diagram illustrating a configuration example of pixels of the image sensor 100. FIG. 2A schematically shows the configuration of one pixel. FIG. 2B shows the arrangement of the pixel array 101. A pixel 201 illustrated in FIG. 2A includes a microlens 202 as an optical element and a plurality of photodiodes (hereinafter abbreviated as PD) as light receiving elements.

  FIG. 2A illustrates an example in which two pixels, the left PD 203 and the right PD 204, are provided in one pixel, but three or more (for example, four or nine) PDs may be used. The PD 203 photoelectrically converts the received light beam and outputs a left-eye image signal. The PD 204 photoelectrically converts the received light beam and outputs a right-eye image signal. The pixel 201 includes, for example, a pixel amplification amplifier that extracts a PD signal to the readout circuit 103, a row selection switch, a PD signal reset switch, and the like in addition to the illustrated components.

  In order to provide a two-dimensional image, the pixel array 101 is configured by arranging in a two-dimensional array like a plurality of pixels 301 to 304 shown in FIG. The PDs 301L, 302L, 303L, and 304L correspond to the PD 203 in FIG. PDs 301R, 302R, 303R, and 304R correspond to the PD 204 in FIG. That is, the image sensor used in the present embodiment includes a first photoelectric conversion unit (PD 203) that outputs a left-eye image signal and a second photoelectric conversion unit (PD 204) that outputs a right-eye image signal. A plurality of pixel portions. Pixel portions having a plurality of photoelectric conversion portions are arranged side by side in the horizontal direction and the vertical direction.

Next, light reception of the imaging element 100 having the pixel configuration illustrated in FIG. FIG. 3 is a conceptual diagram showing a state in which a light beam that has passed through different regions of the exit pupil of the photographing lens is incident on the image sensor 100 with respect to one optical element (microlens).
The pixel array 101 includes a microlens 202, a color filter 403, and PDs 404 and 405. PD 404 and PD 405 correspond to PD 203 and PD 204 in FIG.

In FIG. 3, the center of the light beam emitted from the exit pupil 406 of the photographing lens with respect to the microlens 202 is an optical axis 409. The light emitted from the exit pupil 406 enters the image sensor 100 with the optical axis 409 as the center. Partial areas 407 and 408 are areas of the exit pupil 406 of the photographing lens. Light rays 410 and 411 are the outermost light rays of the light passing through the partial region 407. Light rays 412 and 413 are the outermost light rays of the light passing through the partial region 408.
Among the light beams emitted from the exit pupil 406, with the optical axis 409 as a boundary line, the upper light beam in FIG. 3 is incident on the PD 405, and the lower light beam is incident on the PD 404. That is, PD 404 and PD 405 each receive light beams from different regions of the exit pupil of the imaging optical system. In this way, each light receiving element detects light in a different region at the exit pupil, and therefore, in a situation where light is taken from a point light source, photographed images having different shapes can be obtained. .

FIG. 4 is a diagram illustrating a configuration example of the imaging apparatus according to the present embodiment. An example in which the image sensor 100 shown in FIG. 1 is applied to a digital camera will be described with reference to FIG.
The lens unit 501 constituting the imaging optical system forms an image of light from the subject on the imaging element 505. The imaging element 505 corresponds to the imaging element 100 illustrated in FIG. 1 and has a pixel configuration illustrated in FIG. The lens driving device 502 performs zoom control, focus control, aperture control, and the like. The mechanical shutter 503 is controlled by a shutter driving device 504. The image sensor 505 converts the subject image formed by the lens unit 501 into an image signal. The imaging signal processing circuit 506 performs various processing (pixel interpolation processing, color conversion processing, etc.) and correction on the image signal output from the imaging element 505. The timing generator 507 outputs a timing signal necessary for the image sensor 505 and the image signal processing circuit 506.

  A system control unit 509 is a control unit that performs various calculations and controls the entire imaging apparatus, and performs various processes by interpreting and executing a program by a CPU (central processing unit) (not shown). Note that the system control unit 509 can perform AF (autofocus) control by comparing each data of the left-eye image and the right-eye image and detecting a phase difference.

  The memory unit 508 includes a memory that temporarily stores image data. A recording medium control interface unit (hereinafter abbreviated as I / F unit) 510 that performs recording control is provided for recording or reading image data, parallax map data described later, and the like on the recording medium 511. The recording medium 511 that can be attached to and detached from the imaging apparatus is a semiconductor memory or the like. The external I / F unit 512 transmits and receives data to and from an external device such as a computer device, and the user can perform image processing. Further, the user can operate the digital camera using an operation unit (not shown) connected to the external I / F unit 512.

  The image composition circuit 513 performs an addition averaging process on the image data output from the image sensor 505 for each pixel and performs a process of acquiring only a necessary PD signal. Taking FIG. 2 as an example, for the pixel signals 301L, 301R, 302L, 302R, 303L, 303R, 304L, and 304R output from each PD, only the output of the left PD is extracted (301L, 302L, and 303L). 304L). Further, it is assumed that only the output of the right PD is taken out (301R, 302R, 303R, 304R). Composite image data is created from ((301L + 301R) / 2, (302L + 302R) / 2, (303L + 303R) / 2, (304L + 304R) / 2) obtained by averaging the outputs of the left PD and right PD.

  The parallax map generation circuit 514 calculates the amount of positional deviation between the left-eye image / right-eye image based on the position of the subject image in the composite image as the parallax amount. Information on the calculated amount of parallax is stored in the memory unit 508 as a parallax map. The compression / decompression circuit 515 compresses the image data stored in the memory unit 508 according to a predetermined image compression method (for example, adaptive discrete cosine transform (ADCT)). The compression / decompression circuit 515 has a function of writing image data that has been compressed into the memory unit 508, and a function of expanding image data read from the memory unit 508 and writing it into the memory unit 508.

  The display unit 516 displays various information and captured images in accordance with display data from the display control circuit 517. A display control circuit 517 performs display control for displaying image data for two-dimensional display and display control for displaying image data in stereoscopic display.

Next, the operation of the digital camera at the time of shooting will be described.
When the main power supply of the image pickup apparatus is turned on, the power supply of the control system circuit unit is turned on, and the power supply of the image pickup processing system circuit such as the image pickup signal processing circuit 506 is turned on. When the user operates a release button (not shown), the system control unit 509 performs a calculation related to focus state detection based on data from the image sensor 505, and calculates a distance from the imaging device to the subject. Thereafter, the lens driving device 502 drives the movable lens of the lens unit 501, and the system control unit 509 determines whether or not it is in focus.

  If the system control unit 509 determines that it is not in focus, the system control unit 509 executes focus state detection processing again by driving control of the lens unit 501. Note that the calculation for obtaining the distance to the subject may be a method using a dedicated distance measuring device (not shown) in addition to the method of calculating from the imaging data by the imaging element 505. The system control unit 509 starts the photographing operation after determining the focused state. When the photographing operation is completed, the imaging signal processing circuit 506 processes the image signal output from the imaging element 505, and the system control unit 509 performs control to write image data in the memory unit 508.

  The imaging data output by the imaging element 505 is output as image signals from a plurality of PDs. In the example shown in FIG. 2B, image signals are output in the order of PDs 301L, 301R, 302L, 302R, 303L, 303R, 304L, and 304R. The imaging signal processing circuit 506 performs image processing by sorting imaging data output from the imaging element 505 into left-eye image data and right-eye image data. The left-eye image data is image data obtained as a result of selecting and processing only the outputs of the left PD 301L, 302L, 303L, 304L, etc. in FIG. The right-eye image data is image data obtained as a result of selecting and processing only the outputs of the right PD 301R, 302R, 303R, 304R, etc. in FIG. The left-eye image data and the right-eye image data are held in the memory unit 508 separately.

  The image composition circuit 513 reads the left eye image data and the right eye image data held in the memory unit 508 and generates composite image data. The generated composite image data is stored in the memory unit 508. The image processing executed by the image composition circuit 513 is a process of calculating an addition average value for each pixel for the left-eye image and the right-eye image. Therefore, the composite image generated by this image processing is an image reflecting the shape of the subject. That is, even when the imaging element 505 captures the subject image in the left-eye image and the right-eye image differently, the shape of the subject image is interpolated by the image processing of the image composition circuit 513, so that the correct shape is obtained. Image data is generated. For example, even when the shape of the subject is circular and the left-eye image and the right-eye image are not circular, the composite image has the same circular shape as the subject.

  Next, the parallax map generation circuit 514 generates a parallax map and stores the parallax map data in the memory unit 508. The parallax map generation circuit 514 generates a parallax map using the amount of positional deviation between the left-eye image / right-eye image based on the position of the composite image as a parallax amount.

FIG. 5 is a diagram illustrating an example of a disparity map generation process. Reference numeral 601 in FIG. 5A indicates a composition obtained by photographing a subject. Reference numerals 602, 603, and 604 denote subjects. In the composition shown in FIG. 5A, the subjects 602, 603, and 604 are arranged in this order from the top. In addition, the subject is arranged side by side in the depth direction as shown in FIG. Reference numeral 604 indicates a subject closest to the camera, and reference numeral 602 indicates a subject farthest from the camera.
FIG. 5B shows a stereo image obtained by photographing the composition shown in FIG. An image 605 shows a left-eye image, and an image 606 shows a right-eye image. In the left-eye image 605, subjects 602, 603, and 604 are shown as 607L, 608L, and 609L, respectively. In the right-eye image 606, subjects 602, 603, and 604 are shown as 607R, 608R, and 609R, respectively.

  There is a positional deviation between the subject image in the left-eye image 605 and the subject image in the right-eye image 606. In this embodiment, the amount of positional deviation between the two is defined as the amount of parallax. Reference numeral 610 indicates a positional shift amount in the right-eye image 606 based on the position of the subject 602 in the left-eye image 605, that is, a parallax amount between 607L and 607R. Similarly, reference numeral 611 indicates a positional shift amount in the right-eye image 606 with reference to the position of the subject 604 in the left-eye image 605, that is, a parallax amount between 609L and 609R. For the subject 603, the position in the left-eye image 605 and the position in the right-eye image 606 are the same. That is, for the subject 603, the parallax amount is zero.

First, the parallax map generation circuit 514 detects subjects included in the left-eye image 605 and the right-eye image 606 using a known pattern matching method. The parallax map generation circuit 514 executes the following processing for each detected subject.
The parallax map generation circuit 514 calculates a positional deviation amount from the midpoint between the centroids of the subject images in the left-eye image 605 and the right-eye image 606 to the centroid of the subject image in the left-eye image 605 as a parallax amount. In other words, the parallax map generation circuit 514 uses the position of the center of gravity of the subject image in the composite image generated based on the left-eye image 605 and the right-eye image 606 as a reference, and the position of the center of gravity of the subject in the left-eye image. The deviation amount is calculated as the parallax amount. The calculated amount of parallax is the amount of parallax corresponding to the image for the left eye. Of course, the parallax map generation circuit 514 calculates the displacement amount of the center of gravity of the subject image in the right-eye image based on the position of the center of gravity of the subject image in the composite image as a parallax amount corresponding to the right-eye image. Also good.

  In the example illustrated in FIG. 5B, for the subject 602, the parallax map generation circuit 514 calculates a parallax amount 612 that is half of the parallax amount 610. For the subject 604, the parallax map generation circuit 514 calculates a parallax amount 613 that is half the parallax amount 611. The parallax map generation circuit 514 stores information regarding the calculated parallax amounts 612 and 613 and position information of an image serving as a reference for the parallax amount in the memory unit 508 as a parallax map. In this example, the position information of the image serving as a reference for the amount of parallax indicates the center of gravity of the subject image in the composite image. As described above, in the example illustrated in FIG. 5B, the parallax amount is zero for the subject 603.

  FIG. 6 is a diagram schematically illustrating a parallax map. The parallax map 621 includes a parallax amount 622 and information 623 on the position (center of gravity) of the image serving as a reference for the parallax amount.

Next, an image reproduction process using a parallax map will be described.
The system control unit 509 reads the composite image data and the parallax map data from the memory unit 508. The system control unit 509 confirms that the position of the image serving as the reference of the parallax amount indicated by the parallax map data is the center of gravity of the subject image in the composite image. Then, the system control unit 509 shifts the subject image in the composite image by the amount of parallax indicated by the parallax map data, thereby generating the left-eye image to be reproduced, that is, the reproduction data of the image corresponding to the parallax amount. .

  Also, the system control unit 509 inverts the sign of the amount of parallax indicated by the parallax map data. The system control unit 509 uses the parallax amount obtained by inverting the sign of the parallax amount indicated by the parallax map as the positional deviation amount of the center of gravity of the subject in the image for the right eye with reference to the center of gravity of the subject image in the composite image. . Then, the system control unit 509 shifts the subject image in the composite image by the amount of parallax obtained by inverting the sign of the parallax amount indicated by the parallax map data. As a result, the right-eye image to be reproduced, that is, reproduction data for an image other than the image corresponding to the parallax amount indicated by the parallax map data is generated.

Note that the pixel at the position where the subject image is arranged becomes a missing pixel due to the shift of the subject image in the composite image. The system control unit 509 assigns color space information to the missing pixels using, for example, a technique described in Reference Document 1 below. That is, the system control unit 509 calculates the average value of the pixel values of the pixels near the missing pixel as color space information, and gives the calculated color space information to the missing pixel.
Reference 1: Japanese Patent No. 3524147

  As described above, the imaging apparatus according to the present embodiment combines the left-eye image and the right-eye image to generate a composite image that reflects the shape of the subject, and relates to the amount of parallax based on the position in the composite image. Information is generated as parallax map data. The memory unit 508 stores left-eye image data and right-eye image data, combined image data generated by the image combining circuit 513, and disparity map data generated by the disparity map generating circuit 514.

  Based on the composite image data and the parallax amount indicated by the parallax map data, the left-eye image data and the right-eye image data to be reproduced are generated. Therefore, even when the shape of the image for the left eye and the image for the right eye obtained by photoelectric conversion of the light beam that has passed through different areas of the exit pupil of the photographing optical system is different from the subject shape, the shape of the subject is changed during image reproduction. The reflected correct image can be played back.

[First Embodiment]
Next, the file structure of the image data in the first embodiment of the present invention will be described with reference to FIG.
FIG. 7 shows an example of the structure when an image file compliant with the DCF standard including a parallax map is created. DCF (Design Rule for Camera File System) is an image file format for handling image data with a common specification in a digital camera. The image file 6000 includes a DCF header portion 6003, a thumbnail image portion 6004, a JPEG image portion 6005, and a parallax map portion 6006. JPEG is an abbreviation for “Joint Photographic Experts Group”.

The DCF image data portion 6001 includes a DCF header portion 6003, a thumbnail image portion 6004, and a JPEG image portion 6005. The DCF header portion 6003 is an area for storing DCF header information, and is given a predetermined data size in advance. The DCF header information includes the following supplementary information and offset information for specifying an area for storing each image data (indicated by a sign in parentheses).
Metadata A (6007): shooting information and parameters related to image data stored in the JPEG image portion 6005.
Offset value B (6008): Offset data up to the top position of the thumbnail image portion 6004.
Offset value C (6009): Offset data up to the top position of the JPEG image portion 6005.
Offset value D (6010): Offset data up to the top position of the parallax map portion 6006.
The offset values B, C, and D are relative position information from the reference position of the DCF header portion 6003 to each image portion, and the start position of each image data in the image file is specified by these values.

  The thumbnail image portion 6004 is an area for storing thumbnail image data that has been resized by thinning out the JPEG image data stored in the JPEG image portion 6005. The thumbnail image data is used, for example, when displaying a plurality of reduced images (index display) on the screen of the display unit 516.

The JPEG image portion 6005 is an area for storing JPEG image data obtained by processing RAW image data with the imaging signal processing circuit 506 and then compressing it. The RAW image is an image obtained from the data of each pixel by the image sensor, and means an image before image processing, that is, before performing development processing or the like. JPEG image data is data that can be handled by many applications, and in the present embodiment, JPEG image data obtained by combining a right-eye image and a left-eye image is stored. By adding and synthesizing both images, the data of the JPEG image portion 6005 can be reproduced as a correct subject shape for 2D display. Note that the addition synthesis includes addition averaging processing. Further, by using the parallax map, the image for the left eye and the image for the right eye can be restored, and image data that can be reproduced for 3D display can be obtained.
The parallax map unit 6006 is an area for storing a parallax amount related to the image data of the JPEG image unit 6005. The amount of parallax is calculated by the above method.

  Next, an image file recording operation in the present embodiment will be described with reference to FIG. FIG. 8 is a flowchart for explaining a series of sequences from the start of shooting to recording of an image file on the recording medium 511. In the following, a case where the photographer has made a setting for performing 3D photographing before photographing and a case where this is not the case will be described.

  In step S6101, as described with reference to FIG. 5, in response to a user operation of a release button (not shown), a series of shooting processes including AF (autofocus) processing, AE (automatic exposure) processing, and exposure processing is performed. In next step S6102, an image file including a parallax map or an image file not including a parallax map is created, and the created image file is temporarily stored in the memory unit 508. Details of the DCF file creation processing will be described later with reference to FIGS. In step S6103, a recording process for writing the image file data generated in step S6102 and temporarily stored in the memory unit 508 to the recording medium 511 is performed.

Next, the image file creation processing in S6102 of FIG. 8 will be described with reference to FIG.
First, in step S6201, the imaging signal processing circuit 506 acquires RAW data output from the imaging element 505. The image composition circuit 513 generates composite image data using the acquired RAW data (S6202). The generated composite image data is stored in the memory unit 508.
In step S6203, it is determined whether a parallax map needs to be created. For example, when 3D shooting is performed according to a user operation, a parallax map is necessary, but when 2D shooting is performed, a parallax map is not necessary. Here, a case where a parallax map is generated will be described.

The disparity map generation processing in S6204 will be described with reference to FIG.
First, the image composition circuit 513 generates left-eye image data from the RAW data acquired in S6201 (S6301), and further generates right-eye image data (S6302). Note that the order of generating the left-eye image data and the right-eye image data may be reversed.
Resize processing according to the size of the JPEG image is performed on each generated image data (S6303). Next, the parallax map generation circuit 514 generates parallax map data from the resized left-eye image data and right-eye image data (S6304). The generated parallax map data is stored in the memory unit 508. Note that the disparity map data may be generated from the data of the left-eye image and the right-eye image that have not been resized, and then the resizing process may be performed.

  In S6205 of FIG. 9, thumbnail image data is generated, and JPEG image data is generated in S6206. A process of reading the composite image data stored in the memory unit 508 is executed, and the compression / decompression circuit 515 performs an image compression process according to the set mode. In the free area of the memory unit 508, JPEG image data and thumbnail image data that have been subjected to a series of processing from the start of shooting are stored.

  Finally, a DCF header is created (S6207), and the creation process of the image file 6000 is executed using the thumbnail image, JPEG image, and parallax map data stored in the memory unit 508. At this time, in the DCF header portion 6003, metadata is created from shooting information such as shutter speed and exposure time as metadata A (see 6007 in FIG. 7) such as shooting information and parameters, and these values are set. The Also, an offset value B (see 6008) up to the thumbnail image portion 6004, an offset value C (see 6009) up to the JPEG image portion 6005, and an offset value D (see 6010) up to the parallax map portion 6006 are set based on the data size. Is done. Thus, header information of the DCF header portion 6003 is generated. As a result, information indicating the presence / absence and location of the parallax map (see offset 6010) is stored in the DCF header portion 6003. For example, if the offset value D of the offset 6010 is a predetermined value (for example, “0”), it means that the parallax map is not stored in the image file 6000. When a predetermined value indicating that the parallax map is not included in the image file 6000 is set, or when the offset 6010 itself does not exist in the DCF header portion 6003, it can be determined that the parallax map does not exist. . On the other hand, when a predetermined offset value is given to the offset value D, the parallax map is stored in the image file 6000 and the storage location can be specified from the offset value D.

Next, image file creation processing when no parallax map is generated in S6203 of FIG. 9 will be described with reference to FIG.
The composite image data is stored in the memory unit 508 in the processes of S6201 and S6202. After the determination in S6203, thumbnail image data is generated using the composite image data (S6205), and JPEG image data is generated (S6206). By omitting the disparity map generation process, the memory unit 508 can be saved.

  In S6207, regarding the DCF header portion 6003, metadata is created from metadata A (see 6007 in FIG. 7) such as shooting information and parameters, that is, shooting information such as shutter speed and exposure time, and their values are set. . Further, based on each data size, an offset value B (see 6008) up to the thumbnail image portion 6004, an offset value C (see 6009) up to the JPEG image portion 6005, and an offset value D (see 6010) up to the parallax map portion 6006 are set. Is done. Here, the offset value D stored in the offset 6101 is set to a predetermined value indicating that the parallax map is not included in the image file 6000, for example, “0”. Alternatively, when the parallax map is not included in the image file 6000, the offset 6010 itself may not be generated.

In step S6208, an image file 6000 that does not include a parallax map is created from the data of the generated DCF header portion 6003, thumbnail image portion 6004, and JPEG image portion 6005.
In the present embodiment, the recording process for writing the image file to the recording medium 511 has been described. However, the present invention is not limited to this, and image data and management information attached to the image data are transferred to and from a peripheral device such as a computer device or a printer. Even if they match, the same processing as described above is performed.

  According to the first embodiment, the JPEG image data obtained by combining the left-eye image and the right-eye image is stored in the JPEG image portion of the image file, and the parallax map related to the data is included in the image file. Thereby, it is possible to reproduce an image in 3D display using a parallax map. In applications where the parallax map cannot be used, it is possible to reproduce images in 2D display using JPEG image data subjected to addition synthesis processing, and versatility is guaranteed. That is, in this embodiment, it is possible to create an image file that can be played back in 2D display and 3D display while maintaining a file format that can be played back by a general application.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
Hereinafter, the structure of the image file and the generation process when the parallax map for the thumbnail image is generated will be described with reference to FIG.

FIG. 11 shows an example of the structure of a DCF file including a thumbnail image parallax map.
The DCF image data portion 7001 includes a DCF header portion 7003, a thumbnail image portion 7004, and a JPEG image portion 7005. The DCF header portion 7003 is an area for storing DCF header information, and is given a predetermined data size in advance. The DCF header information includes metadata A (see 7008) such as shooting information and parameters. In addition, an offset value B (see 7009) to the top position of the thumbnail image portion 7004 and an offset value C (see 7010) to the top position of the JPEG image portion 7005 are included. An offset value D (see 7011) indicates an offset to the top position of the thumbnail image parallax map unit 7006. An offset value E (see 7012) indicates offset data up to the head position of the JPEG image parallax map unit 7007. These offset values B, C, D, and E specify the start position of each image data in the image file. Note that the arrangement order of the offset values is an example, and other orders may be used.

The parallax map unit 7002 includes a thumbnail image parallax map unit 7006 and a JPEG image parallax map unit 7007. The parallax map unit 7006 for thumbnail images stores parallax map data generated according to the size of the thumbnail image, and is used for image reproduction processing in 3D display of the thumbnail image. The thumbnail image parallax map unit 7006 is arranged before the JPEG image parallax map unit 7007 (on the DCF header unit 7003 side), but the arrangement order of the parallax maps in the parallax map unit 7002 may be reverse to that in FIG. . The thumbnail image portion 7004, the JPEG image portion 7005, and the JPEG image parallax map portion 7007 are the same as those in the first embodiment, and thus detailed descriptions thereof are omitted.
As shown in FIG. 11, the thumbnail image parallax map and the JPEG image parallax map are arranged at the rear of the image file, so that convenience is improved in image reproduction and parallax map deletion when the parallax map is not used. To do.

Next, generation of a parallax map in the second embodiment will be described with reference to FIGS. 9 and 12.
First, the composite image data is stored in the memory unit 508 in the processes of S6201 and S6202 of FIG. The image composition circuit 513 generates left-eye image data (S7101 in FIG. 12), and generates right-eye image data (S7102). Resize processing is executed on each generated image data in accordance with the set JPEG image size (S7103). The parallax map generation circuit 514 generates a JPEG image parallax map from the right-eye image data and the left-eye image data resized for the JPEG image (S7104).

  Next, in order to generate a thumbnail image parallax map, a resize process to the thumbnail image size is performed on the left-eye image data and the right-eye image data generated in S7101 and S7102 (S7105). The parallax map generation circuit 514 generates parallax map data for thumbnail images from the right-eye image data and the left-eye image data resized for the thumbnail images (S7106). Thereafter, the DCF header portion 7003 is created in the same manner as described in the first embodiment. At this time, by providing the offset value D of the thumbnail image parallax map unit 7006 and the offset value E of the JPEG image parallax map unit 7007, the image file 7000 has separate parallax maps for thumbnail images and JPEG images. Can do.

  As described above, in the second embodiment, a parallax map for thumbnail images is generated, and an image file including the map data is created. Thereby, it is possible to perform image reproduction processing in 3D display for the thumbnail image.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
FIG. 13 illustrates a file structure when an image file including RAW image data is created.

The DCF image data portion 8001 includes a DCF header portion 8003, a thumbnail image portion 8004, a display JPEG image portion 8005, and a RAW image portion 8006. The DCF header portion 8003 is an area for storing DCF header information, and is given a predetermined data size in advance. The DCF header information includes metadata A (see 8010) such as shooting information and parameters related to image data stored in the RAW image unit 8006. In addition, the following offset values are included (indicated by a sign in parentheses).
Offset value B (see 8011): indicates offset data up to the top position of the thumbnail image portion 8004.
Offset value C (see 8012): Indicates offset data up to the top position of the display JPEG image portion 8005.
Offset value D (see 8013): Indicates offset data up to the head position of the RAW image portion 8006.
Offset value E (see 8014): Indicates offset data up to the top position of the parallax map portion 8007 for thumbnail images.
Offset value F (see 8015): Indicates offset data up to the top position of the display JPEG image parallax map portion 8008.
Offset value G (see 8016): Indicates offset data up to the start position of the RAW image parallax map unit 8009.
The start position of each image data in the image file is specified by the offset values B to G.

A RAW image portion 8006 is an area for storing RAW image data. The RAW image data is data read from the image sensor, and is large-size image data before image processing such as development and compression processing is performed. In the present embodiment, an example in which the following two types of RAW image data are handled will be described.
RAW image data obtained by adding and averaging data obtained by a plurality of PDs in each pixel (hereinafter referred to as added RAW image data)
Raw image data (hereinafter referred to as non-added RAW image data) that uses data obtained from each PD in the pixel as it is without performing selection processing or composition processing.

  The added RAW image data is data obtained by subjecting the detection data of each PD in one pixel to the addition averaging process, and is the data after the calculation process, but the RAW image data means that it is not suitable for display or the like. It is. In the present embodiment, the addition RAW image data is described as data after addition averaging processing. However, data obtained by performing only addition processing may be handled as addition RAW image data, and division processing or dynamic range adjustment may be performed in post-processing. Absent.

  The parallax map unit 8002 shown in FIG. 13 includes a thumbnail image parallax map unit 8007, a display JPEG image parallax map unit 8008, and a RAW image parallax map unit 8009. Since the thumbnail image parallax map unit 8007 and the display JPEG image parallax map unit 8008 are the same as those in the second embodiment, detailed description thereof will be omitted.

  The RAW image parallax map unit 8009 is an area for storing the amount of parallax related to the RAW image data of the RAW image unit 8006. In the case of non-addition RAW image data, the information of each PD read from the image sensor 505 is used as it is, so that the parallax map can be restored later. For this reason, in the present embodiment, when the RAW image data stored in the RAW image unit 8006 is non-addition RAW image data, an image file that does not include the RAW image parallax map unit 8009 will be described. In addition, since the thumbnail image portion 8004, the display JPEG image portion 8005, and the like are the same as those in the second embodiment, their detailed description is omitted.

Next, generation of a parallax map in the third embodiment will be described with reference to FIGS. 9 and 14.
First, in the processing of S6201 and S6202 of FIG. The image composition circuit 513 generates left-eye image data (S8101), and generates right-eye image data (S8102). Next, the system control unit 509 determines whether the RAW image data is non-addition RAW image data or addition RAW image data, and determines whether or not it is necessary to create a RAW image parallax map (S8103). ). For determining whether the RAW image data is non-addition RAW image data or addition RAW image data, a method of determining from a mode set by the user or a method of automatically determining from a media capacity, an image size, or the like There is. In the case of addition RAW image data, the process proceeds to S8014. From the left-eye image data and right-eye image data generated in S8101 and S8102, the parallax map generation circuit 514 generates RAW image parallax map data (S8104). Next, the left-eye image data and the right-eye image data generated in S8101 and S8102 are each resized for JPEG images (S8105), and parallax map data of the display JPEG image is generated (S8106). Further, the left-eye image data and the right-eye image data generated in S8101 and S8102 are resized for thumbnail images (S8107), and parallax map data for thumbnail images is generated (S8108).

On the other hand, if it is determined in S8103 that it is non-addition RAW image data, it is not necessary to generate RAW image parallax map data, and the process proceeds to S8105 to perform resizing processing and parallax map generation processing for JPEG images and thumbnail images. Is done.
Similarly to the DCF header portion of the first embodiment, in the DCF header portion 8003, shooting information such as shutter speed and exposure time is set as metadata A (see 8010 in FIG. 13) such as shooting information and parameters. . Further, G is set from the offset values B to G based on the data size, and header information of the DCF header portion 8003 is generated. Thus, the DCF header portion 8003 stores information (offset G) indicating the presence / absence and location of the parallax map for RAW image data. When a predetermined value (for example, “0”) is set as the offset value G indicated by the offset 8016, it means that the RAW image parallax map data is not stored in the image file 8000. Alternatively, when the offset 8016 itself does not exist in the DCF header portion 8003, it can be seen that the RAW image parallax map data is not stored in the image file 8000. If a valid value is given to the offset value G, it is found that the RAW image parallax map data is stored in the image file 8000, and the storage location can be specified from the offset value G.

  As described above, in the third embodiment, it is determined whether or not it is necessary to include parallax map data in an image file depending on whether it is added RAW image data or non-added RAW image data. As a result, when it is determined as non-addition RAW image data, a RAW image parallax map is not necessary, and the file capacity can be reduced accordingly.

  The preferred embodiment of the present invention has been described above, but the arrangement order of offset data stored in the DCF header part and the arrangement order of parallax map data stored in the parallax map part can be arbitrarily changed. In the present embodiment, the thumbnail image parallax map and the display JPEG image parallax map are always created in order to reduce the time required for 3D image playback processing. However, the present invention is not limited thereto, and when a RAW image parallax map exists in an image file, a step of creating a parallax map for a thumbnail image or a parallax map for a display JPEG image and including it in the image file may be deleted.

(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. In this case, the program and the storage medium storing the program constitute the present invention.

505 Imaging device 506 Imaging signal processing circuit 509 System control unit 510 Recording medium control I / F unit 511 Recording medium 513 Image composition circuit 514 Parallax map generation circuit

In order to solve the above problems, an apparatus according to the present invention is obtained by an acquisition unit that acquires a plurality of image signals with different viewpoints that are output from an imaging unit that photoelectrically converts a light beam from a subject, and is acquired by the acquisition unit. Map data corresponding to the distribution of the amount of image misalignment between image signals based on the image signals of the different viewpoints based on the image generation means for synthesizing the image signals of different viewpoints to generate a composite image signal before image processing Map generation means for generating image data, and recording means for generating an image file including the composite image signal and the map data and recording the image file on a recording medium .

Claims (1)

The imaging device has a plurality of photoelectric conversion units that photoelectrically convert light beams that have passed through different areas in the exit pupil of the imaging optical system and output a plurality of image signals, and process the plurality of image signals by the imaging device An imaging device for recording on a recording medium,
Image combining means for acquiring left-eye image data and right-eye image data from an image signal output from the image sensor, and generating combined image data for two-dimensional display by additive combining of the left-eye image and right-eye image When,
Parallax map generating means for generating parallax map data from the data of the left-eye image and right-eye image;
A recording control unit configured to create an image file that includes the combined image data generated by the image combining unit and the parallax map data generated by the parallax map generating unit in different areas and record the image files on the recording medium; An imaging apparatus characterized by that.

Images