US5210797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive dictionary for a fingerprint recognizer
Assignee: KOKUSAN KINZOKU KOGYO A CORP OF JAPAN KK
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Filing: 1990-10-29
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Granted: 1993-05-11
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Expires: 2010-10-29
Abstract
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.
Inventors
- 👤 Toshiyuki Usui
- 👤 Saburou Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/37; G06; G06V; G06V30/00; G06V30/10; G06V30/19; G06V30/192; G06V30/194; G06V40/00; G06V40/10; G06V40/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
270 words
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.
Claim 2
Independent Claim
270 words
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.
Claim 3
Dependent Claim
36 words
A method for fingerprint recognition of claim 1 further comprising a reregistration means and energizing said reregistration means to effect storage of said segments of fingerprint patterns in one of the storage areas of the memory.
Claim 4
Dependent Claim
26 words
A method for fingerprint recognition of claim 1 wherein the fingerprint pattern stored in the first storage area is not overwritten by a new fingerprint pattern.
Claim 5
Dependent Claim
25 words
A method for fingerprint recognition of claim 1, said memory including at least four storage areas for storing different fingerprint patterns for the same fingerprint.
Claim 6
Dependent Claim
47 words
A method according to claim 1 plus the step of discarding the fingerprint pattern which has the lowest number of occurrences of correspondence among the fingerprint patterns stored in said plurality of storage areas whereby the record and quality of the fingerprint of the finger is updated.
Claim 7
Dependent Claim
272 words
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.
Claim 8
Dependent Claim
272 words
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.
Claim 9
Dependent Claim
31 words
The apparatus of claim 6 further comprising an input memory for storing the output of the converter temporarily and for supplying the segments of fingerprint pattern to said comparison judgment section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |