Fingerprint verification method and fingerprint verification device
First Claim
1. A fingerprint verification method using a fingerprint image, the method comprising:
- extracting ND sample feature points (ND is an integer greater than or equal to four) from a fingerprint image that has been sampled;
assigning sample numerical values to each of the sample feature points as sample numerical value information, the sample numerical values being obtained from a plurality of sample connection lines, which connect each of the sample feature points with LD close sample feature points (2≦
LD≦
ND−
1, LD is an integer) which are close to each of the sample feature points;
comparing each of the sample numerical values assigned to each of the sample feature points with each of registration numerical values assigned to each of NR registration feature points (NR is an integer greater than or equal to four), and assigning a registration feature point among the NR registration feature points which corresponds to a registration numerical value that coincides with a sample numerical value among the sample numerical values to the coincided sample numerical value;
deleting a sample feature point among the ND sample feature points which has sample numerical values that have not been assigned with the registration feature points at a percentage equal to or greater than a first percentage;
associating one registration feature point among the assigned registration feature points with only a sample feature point among the remaining sample feature points excluding the deleted sample feature point, the sample feature point including sample numerical values that have been assigned in common at a second percentage or more to the one register feature point; and
when the number of sample feature points associated with the registration feature points is m or more (m is an integer defined as 3≦
m≦
ND and 3≦
m≦
NR), comparing a position relationship among the m or more sample feature points with the position relationship among the registration feature points associated with the m or more sample feature points.
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Abstract
A fingerprint verification method includes extracting ND sample feature points from a fingerprint image that has been sampled, assigning sample numerical values to each of the sample feature points as sample numerical value information. The sample numerical values are obtained from a plurality of sample connection lines, which connect each of the sample feature points with LD close sample feature points, which are close to each of the sample feature points. Based on results of comparison between the sample numerical value information and registration numerical value information, which is registration numerical values assigned to each of NR registration feature points, associating m sample feature points among the ND sample feature points with m registration feature points among the NR registration feature points. A position relationship among the m sample feature points is compared with a position relationship among the m registration feature points.
12 Citations
18 Claims
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1. A fingerprint verification method using a fingerprint image, the method comprising:
-
extracting ND sample feature points (ND is an integer greater than or equal to four) from a fingerprint image that has been sampled; assigning sample numerical values to each of the sample feature points as sample numerical value information, the sample numerical values being obtained from a plurality of sample connection lines, which connect each of the sample feature points with LD close sample feature points (2≦
LD≦
ND−
1, LD is an integer) which are close to each of the sample feature points;comparing each of the sample numerical values assigned to each of the sample feature points with each of registration numerical values assigned to each of NR registration feature points (NR is an integer greater than or equal to four), and assigning a registration feature point among the NR registration feature points which corresponds to a registration numerical value that coincides with a sample numerical value among the sample numerical values to the coincided sample numerical value; deleting a sample feature point among the ND sample feature points which has sample numerical values that have not been assigned with the registration feature points at a percentage equal to or greater than a first percentage; associating one registration feature point among the assigned registration feature points with only a sample feature point among the remaining sample feature points excluding the deleted sample feature point, the sample feature point including sample numerical values that have been assigned in common at a second percentage or more to the one register feature point; and when the number of sample feature points associated with the registration feature points is m or more (m is an integer defined as 3≦
m≦
ND and 3≦
m≦
NR), comparing a position relationship among the m or more sample feature points with the position relationship among the registration feature points associated with the m or more sample feature points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification