Difference detecting apparatus, difference output apparatus, and medium

A non-transitory computer readable medium storing a computer readable program for causing a computer to execute operations for controlling a difference detecting apparatus, the operations comprising:

• receiving one or more first images and one or more second images;
• acquiring (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
• detecting 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.

A method comprising:

• receiving one or more first images and one or more second images;
• acquiring (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
• detecting, using a processor, 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.