The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2006
Filed:
Aug. 31, 2001
Rudolf M. Bolle, Bedford Hills, NY (US);
Sugata Ghosal, New Delhi, IN;
Sarathchandra Pankanti, Mount Kisco, NY (US);
Nalini Ratha, White Plains, NY (US);
Raghavendra U. Udupa, New Delhi, IN;
Rudolf M. Bolle, Bedford Hills, NY (US);
Sugata Ghosal, New Delhi, IN;
Sarathchandra Pankanti, Mount Kisco, NY (US);
Nalini Ratha, White Plains, NY (US);
Raghavendra U. Udupa, New Delhi, IN;
Lenovo (Singapore) Pte. Ltd., Singapore, SG;
Abstract
In an automatic fingerprint authentication or identification system, the fingerprint image acquisition is severely effected by the limitations of the acquisition process. The two modes of input, viz. scanning inked fingerprints from paper records or directly from a finger using live-scan fingerprint scanners suffer from the following noise sources in the input in addition to standard noise in the camera. Non-uniform ink application, uneven pressure while rolling on the paper or pressing on the scanner surface and external dirt like oil and climatic variations in the moisture content of skin are some of the main causes for the ridges and valleys not to be imaged clearly. This invention deals with a method of learning a set of partitioned least-sqaures filters that can be derived from a given set of images and ground truth pairs as an offline process. The learned filters are convolved with input fingerprint images to obtain the enhanced image.