Image processing device and recording medium

A non-transitory computer readable storage medium having a program stored thereon that is executable by a computer to function as sections comprising:

• an image input section that inputs a plurality of images that are continuous in chronological order;
• a variation amount calculation section that calculates respective variation amounts caused by movements of a subject between images that are adjacent in chronological order, for the plurality of input images;
• an interval designation section that sequentially designates a first interval contained in an entire interval in which all of the plurality of images are present in chronological order, while sequentially altering the first interval, and sequentially designates a second interval, which is an interval excluding the sequentially designated first interval from the entire interval;
• a representative value determination section that determines a first representative value based on first variation amounts, which are calculated by the variation amount calculation section from the images that are present in the designated first interval, and that determines a second representative value based on second variation amounts, which are calculated by the variation amount calculation section from the images that are present in the designated second interval;
• a degree of divergence calculation section that, each time the first interval is designated, calculates a first degree of divergence between the first variation amounts and the first representative value and, each time the second interval is designated, calculates a second degree of divergence between the second variation amounts and the second representative value;
• and
• an image extraction section that extracts images that are present in the first interval designated by the interval designation section at a time when a sum of the calculated first degree of divergence and second degree of divergence is at a minimum.