Fingerprint symmetry axis extraction method and fingerprint recognition method using fingerprint symmetry axis
First Claim
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1. A fingerprint symmetry axis extraction method comprising:
- detecting a core point of a fingerprint;
setting imaginary symmetry axes intersecting the core point; and
extracting an actual fingerprint symmetry axis from the imaginary symmetry axes, the actual fingerprint symmetry axis providing the largest symmetry measure between ridge range directions in paired blocks along the symmetry axis facing each other.
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Abstract
A fingerprint symmetry axis extraction method is provided. The method includes detecting a core point of a fingerprint, setting imaginary symmetry axes intersecting the core point, and extracting an actual fingerprint symmetry axis from the imaginary symmetry axes. The actual fingerprint symmetry axis is one that can provide the largest symmetry measure being obtained between ridge range directions in paired blocks facing each other.
27 Citations
20 Claims
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1. A fingerprint symmetry axis extraction method comprising:
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detecting a core point of a fingerprint; setting imaginary symmetry axes intersecting the core point; and extracting an actual fingerprint symmetry axis from the imaginary symmetry axes, the actual fingerprint symmetry axis providing the largest symmetry measure between ridge range directions in paired blocks along the symmetry axis facing each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fingerprint recognition method comprising:
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scanning a fingerprint image; extracting a fingerprint symmetry axis by which a symmetry measured between ridge range directions along the symmetry axis of the scanned fingerprint image becomes maximum; and performing an authentication for the scanned fingerprint image with reference to the extracted fingerprint symmetry axis. - View Dependent Claims (11, 12, 13, 14)
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15. A fingerprint recognition method comprising:
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calculating first and second sums, the first sum being obtained by summing angles of ridge range direction of paired blocks facing each other with reference to first imaginary symmetry axes, the second sum being obtained by adding an absolute value that is obtained by subtracting the first sum from a predetermined threshold value with respect to all of the blocks; and performing an authentication by selecting one of the first imaginary symmetry axes, which has the smallest second sum. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification