Image processing device, image capturing device, image processing method, and storage medium

An image processing method comprising:

• generating, by at least one processor comprising hardware, a high-resolution combined image by aligning a plurality of time-series images with each other in a high-resolution image space having a resolution higher than a resolution of the plurality of time-series images based on an amount of displacement between the plurality of time-series images, and combining the plurality of time-series images;
• generating, by the at least one processor, a low-resolution combined image by aligning the plurality of time-series images with each other in a low-resolution image space having a resolution equal to or lower than the resolution of the plurality of time-series images based on the amount of displacement, and combining the plurality of time-series images through weighted addition;
• calculating, by the at least one processor, a feature quantity pertaining to a pixel-value change direction at each of plural regions in the generated low-resolution combined image;
• and
• correcting, by the at least one processor, the high-resolution combined image based on the calculated feature quantity.

A non-transitory computer-readable storage medium storing an image processing program thereon, the program being executable to control a computer to execute processes comprising:

• generating a high-resolution combined image by aligning the plurality of time-series images with each other in a high-resolution image space having a resolution higher than a resolution of the plurality of time-series images based on an amount of displacement between the plurality of time-series images, and combining the plurality of time-series images;
• generating a low-resolution combined image by aligning the plurality of time-series images with each other in a low-resolution image space having a resolution equal to or lower than the resolution of the plurality of time-series images based on the amount of displacement, and combining the plurality of time-series images through weighted addition;
• calculating a feature quantity pertaining to a pixel-value change direction at each of plural regions in the generated low-resolution combined image;
• and
• correcting the high-resolution combined image based on the calculated feature quantity.