To provide a masquerade detection system which can detect a masquerade using a photograph, a picture or the like, without using an additional device other than an image picking-up device. A masquerade detection method includes an image conversion step in which an image conversion from one flat plane to the other flat plane is carried out from a first image of an examining object picked up from a first angle into a second image of an examining object picked up from a second angle different from the first angle to generate a converted image, and a masquerade judging step in which the converted image and the second image are entirely or partially compared with each other and, if a compared result satisfies a predetermined condition, an attempt to do a masquerade is judged.
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