Fingerprint Image Enhancement and Rotation Schemes for a Single-Chip Fingerprint Sensor and Identifier

Satoshi SHIGEMATSU  Koji FUJII  Hiroki MORIMURA  Takahiro HATANO  Mamoru NAKANISHI  Namiko IKEDA  Toshishige SHIMAMURA  Katsuyuki MACHIDA  Yukio OKAZAKI  Hakaru KYURAGI  

IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.4   pp.540-550
Publication Date: 2006/04/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.4.540
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
fingerprint identification,  fingerprint sensor,  pixel array,  pixel parallel,  image processing,  image rotation,  

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This paper presents fingerprint image enhancement and rotation schemes that improve the identification accuracy with the pixel-parallel processing of pixels. In the schemes, the range of the fingerprint sensor is adjusted to the finger state, the captured image is retouched to obtain the suitable image for identification, and the image is rotated to the correct angle on the pixel array. Sensor and pixel circuits that provide these operations were devised and a test chip was fabricated using 0.25-µm CMOS and the sensor process. It was confirmed in 150,000 identification tests that the schemes reduce the false rejection rate to 6.17% from 30.59%, when the false acceptance rate is 0.1%.