Patent ID: 8457378

Claim:
An image processing device comprising: a generation unit configured to generate a difference image by performing both (1) a first difference operation of subtraction of a reference image from a comparison image taken before the reference image and subtraction a comparison image taken after the reference image from the reference image, and (2) a second difference operation of subtraction of a comparison image taken before a reference image from the reference image and subtraction of a comparison image taken after the reference image from the reference image; an image designation unit configured to designate the reference image and the comparison images from plural images stored in a storage unit; a determination unit configured to perform either (1) a first determination, of subtracting the reference image from a comparison image taken before the reference image and subtracting a comparison image taken after the reference image from the reference image, or (2) a second determination, of subtracting the comparison image taken before the reference image from the reference image and subtracting the comparison image taken after the reference image from the reference image; and a display control unit configured to display the difference image generated by said generation unit corresponding to determination by said determination unit.