Methods for digitally noise averaging and illumination equalizing fingerprint images
Patent 4811414 Issued on March 7, 1989. Estimated Expiration Date: 
February 27, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 27, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3200701 3478658 3482498 3581282 3614737 3639905 3648240 3743772 Electro-optical method and apparatus for making identifications Spurious signal removal in optical processor fingerprint identification apparatus InventorsAssigneeApplicationNo. 07/020331 filed on 02/27/1987US Classes:382/272, Based on a local average, mean, or median348/615, Blackspot or shading correction (e.g., corrects for fixed pattern defects)382/124, Using a fingerprint382/298To change the scale or size of an imageExaminersPrimary: Boudreau, Leo H.Assistant: Daley, Donald J. Attorney, Agent or FirmInternational ClassesG06T 5/00 (20060101)A61B 5/117 (20060101) G06K 9/00 (20060101) AbstractMethods for operating a programmable digital computer to enhance images of fingerprints represented by an array of pixel values. Methods for noise averaging, illumination equalizing, directional filtering, unhairing, curvature correcting, and scale correcting a fingerprint image are disclosed. | |
