Provided is an image processing device, and the like, that can appropriately extract a representative image even in a case where it is difficult to continuously pick up images, in a stable state, of a subject due to changes in the characteristics of an organism and in the image pickup conditions. An image processing device (1) comprises: a detection unit (110) that detects an abnormal region from a series of images acquired by sequentially picking up images of the inside of a lumen of the organism, and that extracts abnormal images which include the abnormal region a proximity range setting unit (120) that sets, as a time-sequence proximity range, the proximity range of abnormal images in the series of images which are arranged in time-sequence order an abnormal image group extraction unit (130) that, on the basis of the time-sequence proximity range, extracts an abnormal image group from the abnormal images extracted by the detection unit (110), the images of the group including the same abnormal region and a representative image extraction unit (140) that extracts a representative image from the abnormal image group. The proximity range setting unit (120) sets, as the time-sequence proximity range, a range that is wider than the intervals between the images which are continuous in a time sequence in the series of images.La présente invention se rapporte à un dispositif de traitement dimage, et analogue, qui peut extraire de façon appropriée une image représentative même dans un cas dans lequel la prise continue dimages, dans un état stable, dun sujet est difficile en raison de changements dans les caractéristiques dun organisme et dans les conditions de prise dimage. Le dispositif de traitement dimage (1) selon linvention comprend : une unité de détection (110) qui détecte une région anormale à partir dune série dimages acquises par prise séquentielle dimages de lintérieur dune lumière de lorganisme et qui extrait des images anormales qui comprennent la région ano
