Image processing device, image processing method, and storage medium

An image processing device comprising:

• at least one processor configured to:
• set, as a range for which image data is output, in a position in a central part of a frame image region related to a plurality of frame images, an output target region smaller than the frame image region;
• set an out-of-frame monitor region to be a target for detecting a subject in a position deviated in a predetermined direction from the central part, in a part of the frame image region outside the output target region;
• acquire a first image and a second image generated after the first image, the first image and the second image being included in the plurality of frame images;
• execute detection processing for detecting a subject in the output target region and the out-of-frame monitor region for the first image and the second image;
• in a case where the subject is detected in the output target region of the first image and the subject is detected in a certain out-of-frame monitor region of the second image by the detection processing, reset the position of the output target region in the second image such that the output target region includes, in an end part thereof, at least a part of the certain out-of-frame monitor region;
• and
• reset the out-of-frame monitor region such that the positional relationship between the output target region and the out-of-frame monitor region after resetting of the output target region is the same as the positional relationship between the output target region and the out-of-frame monitor region before resetting of the output target region.

An image processing device comprising:

• at least one processor configured to:
• set, as a range for which image data is output, in a position in a central part of a frame image region related to a plurality of frame images, an output target region smaller than the frame image region;
• and
• set an out-of-frame monitor region to be a target for detecting a subject in a position deviated in a predetermined direction from the central part, in a part of the frame image region outside the output target region,
• wherein the output target region is rectangular, and
• wherein the at least one processor is further configured to set one out-of-frame monitor region for each of four sides of the output target region.

An image processing device comprising:

• at least one processor configured to:
• set, as a range for which image data is output, in a position in a central part of a frame image region related to a plurality of frame images, an output target region smaller than the frame image region;
• set an out-of-frame monitor region to be a target for detecting a subject in a position deviated in a predetermined direction from the central part, in a part of the frame image region outside the output target region;
• and
• set the out-of-frame monitor region in a position not in contact with an outer periphery of the output target region.