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An Adaptive Fingerprint-Sensing Scheme for a User Authentication System with a Fingerprint Sensor LSI
Hiroki MORIMURA Satoshi SHIGEMATSU Toshishige SHIMAMURA Koji FUJII Chikara YAMAGUCHI Hiroki SUTO Yukio OKAZAKI Katsuyuki MACHIDA Hakaru KYURAGI
IEICE TRANSACTIONS on Electronics
Publication Date: 2004/05/01
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Integrated Electronics
fingerprint sensor, adaptive fingerprint-sensing, adjustable A/D conversion, fingerprint image quality evaluation,
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This paper describes an adaptive fingerprint-sensing scheme for a user authentication system with a fingerprint sensor LSI to obtain high-quality fingerprint images suitable for identification. The scheme is based on novel evaluation indexes of fingerprint-image quality and adjustable analog-to-digital (A/D) conversion. The scheme adjusts dynamically an A/D conversion range of the fingerprint sensor LSI while evaluating the image quality during real-time fingerprint-sensing operation. The evaluation indexes pertain to the contrast and the ridgelines of a fingerprint image. The A/D conversion range is adjusted by changing quantization resolution and offset. We developed a fingerprint sensor LSI and a user authentication system to evaluate the adaptive fingerprint-sensing scheme. The scheme obtained a fingerprint image suitable for identification and the system achieved an accurate identification rate with 0.36% of the false rejection rate (FRR) at 0.075% of the false acceptance rate (FAR). This confirms that the scheme is very effective in achieving accurate identification.