Title :
An advanced fingerprint sensor LSI and its application to a fingerprint identification system
Author :
Morimura, H. ; Shigematsu, S. ; Shimamura, T. ; Fujii, K. ; Yamaguchi, C. ; Suto, H. ; Okazaki, Y. ; Machida, K. ; Kyuragi, H.
Author_Institution :
NTT Lifestyle & Environ. Technol. Labs., Kanagawa, Japan
Abstract :
We developed an advanced fingerprint sensor LSI that features a novel sensor structure, sensing circuit, and calibration circuit, using the 0.5-/spl mu/m CMOS process/sensor process. The LSI is reliable, sensitive, and tolerant to changes in the sensor surface conditions for capturing clear fingerprint image over long-term use. We also introduce a fingerprint-image adjustment scheme with an adjustable A/D converter to obtain image quality suitable for identification. The fingerprint sensor LSI was applied to a fingerprint identification system with the fingerprint-image adjustment scheme and achieved sufficient performance for a practical fingerprint identification system.
Keywords :
CMOS integrated circuits; analogue-digital conversion; calibration; capacitive sensors; fingerprint identification; large scale integration; 0.5 micron; CMOS process/sensor process; adjustable A/D converter; calibration circuit; fingerprint identification system; fingerprint sensor LSI; image adjustment scheme; image quality; sensing circuit; sensor structure; sensor surface conditions; CMOS process; Calibration; Circuits; Fingerprint recognition; Image converters; Image matching; Image sensors; Large scale integration; Sensor phenomena and characterization; Sensor systems and applications;
Conference_Titel :
VLSI Circuits Digest of Technical Papers, 2002. Symposium on
Conference_Location :
Honolulu, HI, USA
Print_ISBN :
0-7803-7310-3
DOI :
10.1109/VLSIC.2002.1015103
