Image processing device, imaging device, image processing method and computer readable medium

An image processing device comprising:

• an image acquisition section that acquires a first image and a second image, based on a first image signal and a second image signal that are output from an image pick-up device that include a first pixel group and a second pixel group that output the first and second image signals due to respective images being formed by a pupil-divided subject-image that has passed through a first region and a second region of an imaging lens;
• a sensitivity acquisition section that acquires sensitivity to light incident through the first region of pixels in a pupil division direction of the first pixel group, and acquires sensitivity to light incident through the second region of pixels in the pupil division direction of the second pixel group;
• a correction section that derives linearly approximated sensitivity correction coefficients for each of the first image and the second image based on the sensitivities acquired by the sensitivity acquisition section, and corrects brightnesses of the first and second images based on the derived sensitivity correction coefficients;
• a generation section that generates a first display image based on an image signal that is output from the image pick-up device, and generates a second display image, for use in focus verification, based on the first and second images corrected by the correction section;
• a display section that displays images;
• and
• a display controller that performs control to inhibit continuous display of the first display image, that is generated by the generation section, as a video image using the display section, and to continuously display on the display section the second display image, that is generated by the generation section, as a video image.

An image processing method comprising:

• acquiring a first image and a second image, based on a first image signal and a second image signal that are output from an image pick-up device that includes a first pixel group and a second pixel group that output the first and second image signals due to respective images being formed by a pupil-divided subject-image that has passed through a first region and a second region of an imaging lens;
• acquiring sensitivity to light incident through the first region of pixels in a pupil division direction of the first pixel group, and acquiring sensitivity to light incident through the second region of pixels in the pupil division direction of the second pixel group;
• deriving linearly approximated sensitivity correction coefficients for each of the first image and the second image based on the acquired sensitivities, and correcting brightnesses of the first and second images based on the derived sensitivity correction coefficients;
• generating a first display image based on an image signal that is output from the image pick-up device, and generating a second display image, for use in focus verification, based on the corrected first and second images;
• and
• performing control to continuously display the generated first display image as a video image on a display section that displays images, and to continuously display the generated second display image as a video image within a display region of the first display image.

An image processing method comprising:

• acquiring a first image and a second image, based on a first image signal and a second image signal that are output from an image pick-up device that includes a first pixel group and a second pixel group that output the first and second image signals due to respective images being formed by a pupil-divided subject-image that has passed through a first region and a second region of an imaging lens;
• acquiring sensitivity to light incident through the first region of pixels in a pupil division direction of the first pixel group, and acquiring sensitivity to light incident through the second region of pixels in the pupil division direction of the second pixel group;
• deriving linearly approximated sensitivity correction coefficients for each of the first image and the second image based on the acquired sensitivities, and correcting brightnesses of the first and second images based on the derived sensitivity correction coefficients;
• generating a first display image based on an image signal that is output from the image pick-up device, and generating a second display image, for use in focus verification, based on the corrected first and second images;
• and
• performing control to inhibit continuous display of the generated first display image as a video image using a display section, and to continuously display on the display section the generated second display image as a video image.