US 6,983,062 B2
Fingerprint scanner auto-capture system and method
David C. Smith, Tequesta, Fla. (US)
Assigned to Cross Match Technologies, Inc., Palm Beach Gardens, Fla. (US)
Filed on Mar. 30, 2001, as Appl. No. 9/821,044.
Claims priority of provisional application 60/226092, filed on Aug. 18, 2000.
Prior Publication US 2002/0021827 A1, Feb. 21, 2002
Int. Cl. G06K 9/00 (2006.01)
U.S. Cl. 382—124 49 Claims
OG exemplary drawing
 
1. A method of capturing an acceptable fingerprint image comprising the steps of:
(a) capturing an initial fingerprint image at a nominal image integration time;
(b) capturing a first intermediate fingerprint image at a first intermediate image integration time;
(c) performing a fingerprint image darkness test, including calculating average darkness values for a plurality of image darkness lines arranged in pairs of image darkness lines, said pairs of image darkness lines situated within an expected image capture region; and
(d) performing an image definition test.