Adaptive dictionary for a fingerprint recognizer
First Claim
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1. A method for fingerprint recognition including a registration means having a write mode and a read mode comprising the steps of:
- receiving an initial fingerprint pattern of light beams reflected on a surface of a finger;
storing said initial fingerprint pattern in a first storage area of a plurality of storage areas within a memory when said registration means is in the write mode;
receiving a second fingerprint pattern of light beams reflected on the surface of the finger when said registration means is in the read mode;
comparing segments of fingerprint pattern already stored with segments of the second fingerprint pattern when said registration switch is in the read mode;
providing a correspondence signal when at least a predetermined number of segments correspond;
storing said segments of the second fingerprint pattern in a second storage area of the memory;
computing the number of occurrences of correspondence between the segments of fingerprint pattern stored in the memory and the segments of the second fingerprint pattern;
receiving a third fingerprint pattern of light beams reflected on the surface of the finger when said registration switch is in the read mode;
comparing the segments of fingerprint pattern already stored in the storage areas of the memory with segments of the third fingerprint pattern;
providing a correspondence signal when at least a predetermined number of segments correspond; and
storing the third fingerprint pattern in the memory in place of a fingerprint pattern with the lowest number of occurrences of correspondence among the fingerprint patterns already stored in the registration areas of the memory whereby all of the storage areas store different fingerprint patterns.
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Abstract
A method and apparatus for fingerprint recognition is provided in accordance with the present invention to achieve a higher rate of recognition by subsequently storing fingerprint patterns with higher rates of correspondence in place of fingerprint patterns already stored having low rates of correspondence.
97 Citations
7 Claims
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1. A method for fingerprint recognition including a registration means having a write mode and a read mode comprising the steps of:
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receiving an initial fingerprint pattern of light beams reflected on a surface of a finger; storing said initial fingerprint pattern in a first storage area of a plurality of storage areas within a memory when said registration means is in the write mode; receiving a second fingerprint pattern of light beams reflected on the surface of the finger when said registration means is in the read mode; comparing segments of fingerprint pattern already stored with segments of the second fingerprint pattern when said registration switch is in the read mode; providing a correspondence signal when at least a predetermined number of segments correspond; storing said segments of the second fingerprint pattern in a second storage area of the memory; computing the number of occurrences of correspondence between the segments of fingerprint pattern stored in the memory and the segments of the second fingerprint pattern; receiving a third fingerprint pattern of light beams reflected on the surface of the finger when said registration switch is in the read mode; comparing the segments of fingerprint pattern already stored in the storage areas of the memory with segments of the third fingerprint pattern; providing a correspondence signal when at least a predetermined number of segments correspond; and storing the third fingerprint pattern in the memory in place of a fingerprint pattern with the lowest number of occurrences of correspondence among the fingerprint patterns already stored in the registration areas of the memory whereby all of the storage areas store different fingerprint patterns. - View Dependent Claims (2, 3, 4, 5)
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6. In an apparatus for fingerprint recognition including a light source;
- a prism for receiving the light from the light source as well as providing a positioning guide for a finger whose fingerprint is to be detected;
a light receptor means for receiving the light reflected on a surface of a finger;
a converter for analog-to-digital conversion of output from the light receptor means followed by binary quantization;the improvement comprising; a memory including a plurality of storage areas, each of which stores a fingerprint pattern captured from the surface of the same finger; a registration switch for changing said memory into write or read mode and for storing an initial fingerprint pattern in a first storage area of the memory only when the registration switch is in the write mode; a comparison judgment section for comparing segments of fingerprint pattern forwarded through said registration switch in the read mode with segments of fingerprint pattern stored in at least one of the storage areas of said memory, and for providing a correspondence signal when at least a predetermined number of segments correspond; and a reregistration area judgment section for computing the rate of correspondence based on the correspondence signal from the comparison judgment section, storing said segments of the subsequent fingerprint pattern in another storage area of the memory, and storing the subsequent fingerprint pattern in the memory in place of a fingerprint pattern with the lowest rate of correspondence among the fingerprint patterns already stored in the registration areas of the memory after all of the storage areas store different fingerprint patterns and when said registration switch is in the read mode. - View Dependent Claims (7)
- a prism for receiving the light from the light source as well as providing a positioning guide for a finger whose fingerprint is to be detected;
Specification