System and method for counting ridges in a captured print image
First Claim
Patent Images
1. A method for counting print ridges in a captured print image frame, comprising the steps of:
- (A) traversing a pixel path through the captured print image frame;
(B) determining a hysteresis band for the pixel path;
(C) counting a number of crossings of the determined hysteresis band while traversing the pixel path; and
(D) determining a number of print ridges based on the counted number of hysteresis band crossings.
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Abstract
A system and method for counting ridges in a captured print image frame is described. A pixel path through the captured print image frame is traversed. A hysteresis band for the pixel path is determined. A number of crossings of the determined hysteresis band is counted while traversing the pixel path. A number of print ridges based on the counted number of hysteresis band crossings is determined.
102 Citations
34 Claims
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1. A method for counting print ridges in a captured print image frame, comprising the steps of:
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(A) traversing a pixel path through the captured print image frame;
(B) determining a hysteresis band for the pixel path;
(C) counting a number of crossings of the determined hysteresis band while traversing the pixel path; and
(D) determining a number of print ridges based on the counted number of hysteresis band crossings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for counting fingerprint ridges, comprising the steps of:
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(A) identifying a region of interest in a stored fingerprint image frame;
(B) determining a pixel path through the region of interest;
(C) traversing the determined pixel path;
(D) determining a hysteresis band for the determined pixel path;
(E) counting a number of crossings of the determined hysteresis band while traversing the determined pixel path;
(F) determining a number of fingerprint ridges based on the counted number of hysteresis band crossings; and
(G) storing the number of fingerprint ridges determined in step (F). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for counting fingerprint ridges in a captured fingerprint image frame, comprising:
a ridge counter module that includes means for traversing a pixel path through the captured fingerprint image frame, means for determining a hysteresis band for the pixel path, means for counting a number of crossings of the determined hysteresis band while traversing the pixel path, and means for determining a number of fingerprint ridges based on the counted number of hysteresis band crossings. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
Specification