Image correction circuit, image capture device, image correction method, and image correction program
An image capture device for capturing an image of an object includes a plurality of photoelectric conversion elements configured to output a signal corresponding to the image based on an amount of exposure between a first shutter operation for starting exposure and a second shutter operation for ending exposure, a controller configured to control the first shutter operation and the second shutter operation, and an image generation section configured to correct the signal, and to generate an output image corresponding to the signal after being corrected. The image generation section is configured to correct the signal based on variance in exposure duration among the plurality of photoelectric conversion elements between the first shutter operation and the second shutter operation.
1. An image capture device for capturing an image of an object, comprising:
a plurality of photoelectric conversion elements configured to output a signal corresponding to the image based on an amount of exposure between a first shutter operation for starting exposure and a second shutter operation for ending exposure;
a controller configured to control the first shutter operation and the second shutter operation; and
an image generation section configured to correct the signal, and to generate an output image corresponding to the signal after being corrected,
the image generation section configured to correct the signal based on variance in exposure duration among the plurality of photoelectric conversion elements between the first shutter operation and the second shutter operation,
the image generation section configured to set a value of gain to be 1 or greater for all regions of the plurality of photoelectric conversion elements which are exposed between the first and the second shutter operations, for correction in image processing with image data for each of the regions, the image data output from the plurality photoelectric conversion elements.
2. The image capture device according to claim 1 , wherein
the plurality of photoelectric conversion elements include a first photoelectric conversion element and a second photoelectric conversion element having the exposure duration longer than the first photoelectric conversion element, and
if the signal has uniform brightness in light emission, amount of correcting the signal at the first photoelectric conversion element is greater than amount of correcting the signal at the second photoelectric conversion element.
3. The image capture device according to claim 1 , wherein
the image generation section is configured to correct the signal based on the variance in the exposure duration within a range of amount of correction within which signal about the plurality of photoelectric conversion elements are not decreased.
4. The image capture device according to claim 1 , wherein
the first shutter operation is by an electronic shutter, and
the second shutter operation is by a mechanical shutter.
5. The image capture device according to claim 1 , wherein
the plurality of photoelectric conversion elements include first and second photoelectric conversion elements, and
if the first and second photoelectric conversion elements start receiving exposure and end in different timing, amount of correcting for the first photoelectric conversion element is different from amount of correcting for the second photoelectric conversion element.
6. The image capture device according to claim 1 , wherein
the controller is configured to control the second shutter operation by a mechanical shutter,
the plurality of photoelectric conversion elements have a light-receiving surface, and
the image generation section is configured to correct the signal based on a distance between the mechanical shutter and the light-receiving surface in a direction of an optical axis extending from the object to the plurality of photoelectric conversion elements.
7. The image capture device according to claim 1 , wherein
the controller is configured to control the first shutter operation and the second shutter operation on the basis of a prescribed shutter speed, and
the image generation section is configured to correct the signal by using a coefficient on the basis of the shutter speed.
8. The image capture device according to claim 1 , wherein
at least one of the first shutter operation and the second shutter operation is performed by a mechanical shutter, and
the image generation section is configured to acquire at least one of operating history information and operating environment information of the mechanical shutter at a time of capturing the image, and to correct the signal on the basis of at least one of the operating history information and the operating environment information.
9. The image capture device according to claim 1 , wherein
the image generation section is configured to correct the signal by at least one of an optical black correction, a color conversion processing, a sharpness adjustment, a noise removal, a gamma correction, and a resizing processing.
10. The image capture device according to claim 1 , wherein
the image generation section is configured to correct the variance in the exposure duration except in a vertical direction.
11. An image correction circuit, comprising:
an image acquisition section configured to acquire a signal corresponding to an image of an object by using a first shutter operation for starting exposure of a plurality of photoelectric conversion elements and a second shutter operation for ending exposure of the plurality of photoelectric conversion elements; and
a correction section configured to correct the signal,
the correction section configured to correct the signal based on variance in exposure duration among the plurality of photoelectric conversion elements between the first shutter operation and the second shutter operation,
the correction section configured to set a value of gain to be 1 or greater for all regions of the plurality of photoelectric conversion elements which are exposed in image processing with image data for each of the regions, the image data output from the plurality photoelectric conversion elements.
12. The image correction circuit according to claim 11 , wherein
the plurality of photoelectric conversion elements include a first photoelectric conversion element and a second photoelectric conversion having the exposure duration longer than the first photoelectric conversion element,
the correction section configured to correct the signal more by the first photoelectric conversion element than by the second photoelectric element.
13. The image correction device according to claim 11 , wherein
the correction section configured to correct the signal based on variance in exposure duration within a range of amount of correction within which that signal about the plurality of photoelectric conversion elements are not decreased.
14. The image correction circuit according to claim 11 , wherein
the image acquisition section is configured to acquire the signal by using an electronic shutter for the first shutter operation, and a mechanical shutter for the second shutter operation.
15. The image correction circuit according to claim 11 , wherein
the plurality of photoelectric conversion elements include first and second photoelectric conversion elements, and
if the first and second photoelectric conversion element start receiving exposure and end in different timing, amount of correcting for the first photoelectric conversion element is different from amount of correcting for the second photoelectric conversion element.
16. The image correction circuit according to claim 11 , wherein
the second shutter operation is performed by a mechanical shutter,
the plurality of photoelectric conversion elements have a light-receiving surface, and
the image generation section is configured to correct the signal based on a distance between the mechanical shutter and the light-receiving surface in a direction of an optical axis extending from the object to the plurality of photoelectric conversion elements.
17. The image correction circuit according to claim 11 , wherein
the correction section is configured to correct the signal based on a prescribed shutter speed.
18. The image correction circuit according to claim 11 , wherein
at least one of the first shutter operation and the second shutter operation is performed by a mechanical shutter, and
the correction section is configured to acquire at least one of operating history information and operating environment information of the mechanical shutter at a time of capturing the image, and to correct the signal on the basis of at least one of the operating history information and the operating environment information.
19. The image correction circuit according to claim 11 , wherein
the image generation section is configured to correct the signal by at least one from a group consisting of an optical black correction, a color conversion processing, a sharpness adjustment, a noise removal, a gamma correction, and a resizing processing.
20. An image capture device for acquiring a signal corresponding to an image of an object, comprising:
a plurality of photoelectric conversion elements configured to output the signal on the basis of an amount of exposure;
a mechanical shutter configured to at least one of starting and ending of the exposure; and
an image generation section configured to correct the signal based on variance in exposure duration among the plurality photoelectric conversion elements by using at least the mechanical shutter, and based on the signal output by the plurality of photoelectric conversion elements exposed by using at least the mechanical shutter, the image generation section configured to generate an output image corresponding to the signal after being corrected,
the image generation section configured to set a value of gain to be 1 or greater for all regions of the plurality of photoelectric conversion elements which are exposed between the first and the second shutter operations, for correction in image processing with image data for each of the regions, the image data output from the plurality of photoelectric conversion elements.