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Title:
【発明の名称】指紋スキャナにおける較正および修正
Document Type and Number:
Japanese Patent JP2003506794
Kind Code:
A
Abstract:
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.

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Inventors:
Irving, Richard Dee.
Scott, Walter Guy
Application Number:
JP2001516124A
Publication Date:
February 18, 2003
Filing Date:
December 15, 1999
Export Citation:
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Assignee:
Cross Match Technologies, Inc.
International Classes:
G06T1/00; G06K9/00; H04L12/40; H04L12/64; (IPC1-7): G06T1/00
Attorney, Agent or Firm:
Shusaku Yamamoto



 
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