发明名称 |
CALIBRATION AND CORRECTION IN A FINGERPRINT SCANNER |
摘要 |
A calibration and correction procedure for a fingerprint scanner. The calibration and correction procedure performs an automatic calibration procedure and gray level linearity procedure. The automatic calibration procedure includes a brightness function to correct for distortions in brightness, a focus check function to identify when the fingerprint scanner is out of focus, and a geometric distortion function to correct for imperfect linearity in the geometry of the fingerprint scanner. The gray level linearity procedure corrects for linear distortions in brightness and contrast of gray levels. |
申请公布号 |
WO0111545(A1) |
申请公布日期 |
2001.02.15 |
申请号 |
WO1999US29535 |
申请日期 |
1999.12.15 |
申请人 |
CROSS MATCH TECHNOLOGIES, INC. |
发明人 |
IRVING, RICHARD, D.;SCOTT, WALTER, GUY |
分类号 |
G06T1/00;G06K9/00;H04L12/40;H04L12/64 |
主分类号 |
G06T1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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