Patent · US Expired

Method for analyzing fingerprint images

US7133541B2 · kind B2 · utility

14Cited by

6References

6Claims

0Family size

Assignee

Infineon Technologies AG · DE

Inventors

Ernst Haselsteiner · Graz, AT
Stefan Jung · Hersbruck, DE
Henning Lorch · Birkenfeld, DE
Brigitte Wirtz · Holzkirchen, DE

Key dates

Filing date	Aug 29, 2002
Grant date	Nov 7, 2006
Priority date	—
Expiry date	Sep 1, 2024

Classification

Technology area (CPC G)Physics
CPC primaryG06V40/40
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A method for analyzing fingerprint images includes picking up a sequence of images at very short time intervals, while a finger is being placed onto an electronic fingerprint sensor. A criterion for recognizing a live finger is extracted from variations in the images. The images are defined as a pixel raster having different gray values, with the aid of which the pixels are assigned binary values of zero or one. Significant changes in the values are detected and compared, with the aid of distinctive numbers or the like, to known typical changes that occur regularly in a particular image class.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.