Patent ID: 8315441

Claim:
A masquerade detection method for detecting a masquerade by comparing an image containing an examining object with an image, which is a target for comparison, containing an examining object, comprising: obtaining an image converting method by comparing an image of a first portion of the examining object picked up from one angle with an image of the first portion of the examining object picked up from other angle; based on the obtained image converting method, converting an image containing the examining object picked up from the one angle into an image of the examining object picked up from the other angle different from the one angle, by performing an image conversion from one flat plane to other flat plane; and judging the masquerade by comparing an image of a second portion different from the first portion in the converted image which is converted from one flat plane to other flat plane and an image of the second portion different from the first portion in the image containing the examining object picked up from the other angle.