Image processing device, imaging device, and image processing method

An image processing device comprising:

• an image acquisition section that alternately acquires pixel-sum values of a first summation unit group and a second summation unit group in each frame of a plurality of frames, when each summation unit of summation units for acquiring the pixel-sum values is set on a plurality of pixels, and the summation units are classified into the first summation unit group and the second summation unit group;
• a resampling section that performs a resampling process on the acquired pixel-sum values in the each frame to calculate a resampling value of each summation unit of the first summation unit group and the second summation unit group;
• an interpolation section that determines whether or not to interpolate the pixel-sum value that is not acquired in a target frame among the plurality of frames based on a time-series change in the resampling value, and interpolates the pixel-sum value that is not acquired in the target frame based on the pixel-sum value acquired in a frame that precedes or follows the target frame;
• and
• an estimation section that estimates pixel values of pixels included in the summation units based on the pixel-sum values acquired in the target frame and the pixel-sum value that has been interpolated by the interpolation section in the target frame.