Oki Electric Industry Co., Ltd.

Toshio Tohne

Akihiro Fujii

Takashi Hashimoto

Masahiko Suzaki

A personal authentication system comprises an imaging section for capturing an image of a user's eye including the iris; pupil/iris region extraction section for extracting a pupil region and an iris region from the captured image; a three-dimensional polar coordinate image creation section for estimating the three-dimensional center position of the eyeball based on the extracted pupil region and iris region and for creating a three-dimensional polar coordinate image by converting the iris region into three-dimensional coordinates with reference to the center position of the eyeball; and a three-dimensional polar coordinate image coding section for creating a three-dimensional polar coordinate image code formed by extracting and coding a characteristic of the created three-dimensional polar coordinate image. The personal authentication system can create iris information highly accurately representing characteristics of a user's iris independent of the direction of line of sight of the user.

Personal authentication system and personal authentication method

There is provided a watermark information detecting method capable of detecting confidential information accurately from a document including confidential information. In this method, a filtering process is performed on the whole surface of an input image (S), and a position of signal is obtained by using a signal position searching template in order for the sum of filter output value to be maximum (S). Then a signal border is determined (S). Even when the image is expanded or contracted due to displacement of paper, etc., the signal position can be correctly detected and confidential information can be correctly detected from a document including confidential information.

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Gunma, Japan

Toshio Tohne