Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-04-26
2005-04-26
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C382S124000, C340S005830
Reexamination Certificate
active
06885017
ABSTRACT:
A method and an apparatus for distinguishing a latent fingerprint is provided to prevent a fingerprint recognition apparatus from mis-recognizing a latent fingerprint as a fingerprint of a biomass due to a fingerprint residual on an imaging surface of an optical fingerprint input apparatus. According to the present invention, there is provided a backlight control device for controlling switching on and off of the backlight; an image acquisition device for acquiring a fingerprint image without illuminating the backlight onto the imaging surface; a fingerprint detection device for detecting the existence of a fingerprint from the image acquired by the image acquisition device; and a device for determining that the fingerprint, if detected by the fingerprint detection device, is a latent fingerprint detected due to an external light.
REFERENCES:
patent: 6125192 (2000-09-01), Bjorn et al.
patent: 6292576 (2001-09-01), Brownlee
patent: 6526396 (2003-02-01), Hiratsuka et al.
Jun Jae-Hyn
Jung Soon-Won
Lee Byung-Jin
Lee Hwi-Seok
GWiPS
Luu Thanh X.
NTTGEN Co., Ltd.
Sohn Seung C.
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