Fingerprint security systems in handheld electronic devices and methods therefor
First Claim
Patent Images
4. A fingerprint information processing method, comprising:
- capturing a fingerprint image having a plurality of pixels with corresponding intensity values;
increasing a range of intensity values of the fingerprint image pixels;
enhancing the fingerprint image having the increased range of intensity values;
identifying minutiae of the enhanced fingerprint image.
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Abstract
Fingerprint image processing methods for fingerprint security systems, for example, in wireless communications devices, including capturing fingerprint images (320), identifying features from images (330), matching the identified features with reference features (340), and providing access to the device based upon feature matching (350) results. In one embodiment, minutiae features are extracted from the image and matched to reference minutiae features.
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Citations
37 Claims
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4. A fingerprint information processing method, comprising:
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capturing a fingerprint image having a plurality of pixels with corresponding intensity values;
increasing a range of intensity values of the fingerprint image pixels;
enhancing the fingerprint image having the increased range of intensity values;
identifying minutiae of the enhanced fingerprint image. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
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13. A fingerprint information processing method, comprising:
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forming a fingerprint image comprising pixels;
identifying minutiae of the fingerprint image;
determining confidence information for each minutia, the confidence information based on pixel direction in a neighborhood of each minutia, continuity of any ridges connected to each minutia, and continuity of ridges neighboring each minutia. - View Dependent Claims (14, 16, 17, 18)
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15. The method 14, dynamically changing the confidence threshold based on the number of minutiae detected.
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19. A fingerprint information processing method, comprising:
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forming an enhanced fingerprint image comprised of pixels;
identifying minutiae of the fingerprint image;
determining confidence information for each minutiae;
comparing confidence information of the minutiae to a dynamically changing confidence threshold. - View Dependent Claims (20)
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21. A fingerprint information processing method, comprising:
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forming a fingerprint image comprised of pixels;
identifying minutiae of the fingerprint image;
forming a negative image of the fingerprint image;
eliminating minutiae from the minutiae identified not having corresponding minutiae in a negative image of the fingerprint image. - View Dependent Claims (22)
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23. A fingerprint information processing method, comprising:
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capturing a plurality of fingerprint images, each fingerprint image having a plurality of pixels with corresponding intensity values;
extracting minutiae from a binarization of each of the fingerprint images, selecting minutiae extracted from at least two of the binarized fingerprint images;
determining a matching threshold based upon a comparison of the minutiae selected. - View Dependent Claims (24, 25)
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26. A fingerprint information processing method, comprising:
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determining alignment of file and search fingerprint minutiae for a plurality of orientations of the file and search fingerprint minutiae;
selecting at least one orientation of the file and search fingerprint minutiae having a greater degree of alignment than other orientations of the file and search fingerprint minutiae;
determining similarity between the file and search fingerprint minutiae by comparing a measure of the alignment of the at least orientation selected to a similarity threshold. - View Dependent Claims (1, 2, 3, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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32-1. The method of claim 31, transmitting the fingerprint minutiae features to a network, determining whether the fingerprint minutiae features match reference minutiae features at the network.
Specification