Method and device for identifying fingerprints
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United States of America Patent
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Nov 12, 2002
Grant Date -
Nov 15, 2001
app pub date -
Apr 4, 2001
filing date -
Feb 22, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A method of identifying fingerprints, the method including the steps of acquiring a test image formed by a number of test points characterized by different grey levels defining a test surface; determining significant points in the test image; and verifying the similarity between regions surrounding the significant points and corresponding regions of a reference image whose points present different grey levels defining a reference surface. The similarity between the regions is verified by computing the integral norm of portions of the test and reference surfaces; and the integral norm is computed using flash cells programmed with a threshold value correlated to the value of the grey levels in the reference region, by biasing the flash cells with a voltage value correlated to the grey level in the test region, and measuring the charge flowing through the flash cells.
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