Patent ID: 8712166

Claim:
A difference detecting device comprising: an image receiving unit that receives at least one or more first images and at least one or more second images; an exception region acquiring unit that acquires (i) first exception regions that include non-background-color pixels of a first common image that consists of non-background-color pixels each of which exists in plural ones of the first images at a common position, (ii) second exception regions that include non-background-color pixels of a second common image that consists of non-background-color pixels each of which exists in plural ones of the second images at a common position, or (iii) both of the first exception regions and the second exception regions; and a first difference detecting unit, implemented by a processor, that detects differences between a first image of attention which is at least one of the first images and a second image of attention which is one of the second images corresponding to the first image of attention except for the first exception regions, the second exception regions, a union of sets of the first exception regions and the second exception regions, or a product of sets of the first exception regions and the second exception regions.