Patent Number: 6,480,617

Title: Method and device for identifying fingerprints

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.

Inventors: Kovacs-Vajna; Zsolt (Bologna, IT)

Assignee: STMicroelectronics S.r.l.

International Classification: A61B 5/117 (20060101); G07C 9/00 (20060101); G06K 9/00 (20060101); G06K 009/00 ()

Expiration Date: 11/12/2019