Hitachi, Ltd.

Ju&nacute;ichi Taguchi

Hiroshi Yoshiura

Isao Echizen

Yutaka Kurosu

Kazunori Nakano

An extraction process includes the steps of carrying out a geometric transformation on a picture being inspected to transform the size of the picture being inspected into a reduced scale of an original picture; creating a plurality of degraded original pictures with different types each obtained as a result of degradation of the original picture; creating a plurality of differential pictures by subtraction of the degraded original pictures with different types from the picture being inspected with a transformed size to cancel degradation components in the picture being inspected with a transformed size; and extracting the information corresponding to the authentication information.

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Sagamihara, Japan

Ju&nacute;ichi Taguchi