NON-CONTACT OPTICAL IMAGING SYSTEM FOR BIOMETRIC IDENTIFICATION

申请公布号：WO2004021254(A3)

申请号：WO2003US26774

申请日期：2003.08.25

申请公布日期：2004.07.08

申请人：

HADDAD, WALEED, S.

发明人：HADDAD, WALEED, S.

分类号：G06K9/00

主分类号：G06K9/00

摘要：An optical system for imaging the features, ridges, and height variations of an object by exploiting the properties of specular reflection of light to maximize the contrast of the features, ridges, and height variations. The system provides a non-contact method of imaging objects suitable for biometric identification, such as the imaging of fingerprints. The system obtains the strong specular reflection using a properly shaped wave front. Optionally, the system can include a polarizer that filters and thereby enhances the specular reflection from the surface. Optionally, the system can also include pre-processing means for adjusting image brightness, contrast, and magnification. .

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