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6 July 2000 High-speed fingerprint optical scanning method
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An optical scanning technique of dactylogram (fingerprint) has been developed by using plural LED's with different wavelength as emitting elements and a color CCD or CMOS area image sensor was receiving element. Owing to the R/G/B filters built in that color area image sensor, if the above LED's have wave lengths corresponding to those peak sensing wavelengths of the R/G/B outputs of that color area image sensor, and if the above mentioned LED's are installed to emit light on the surface of finger from different directions, then it will be effective to get a 3D picture by using a single color area image sensor. Moreover, the time needed to obtain a 3D picture is only that for single exposure.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Warren W. C. Liu, H. C. Lin, C. S. Lin, and H. L. Wang "High-speed fingerprint optical scanning method", Proc. SPIE 4081, Optical Storage and Optical Information Processing, (6 July 2000);


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