Fingerprint registering method and fingerprint checking device

• US 6,314,196 B1
• Filed: 03/07/1997
• Issued: 11/06/2001
• Est. Priority Date: 10/05/1995
• Status: Expired due to Fees

• Current Assignee: Fujitsu Access Ltd. (Fujitsu Limited)
• Original Assignee: Fujitsu Access Ltd. (Fujitsu Limited)
• Inventors: Ooka, Yasuo, Taniguchi, Kiyohide, Uchida, Naoya, Ogawa, Atsushi, Yamaguchi, Masahiko
• Primary Examiner(s): Boudreau, Leo
• Assistant Examiner(s): Mariam, Daniel G.
• Application Number:
  US08/813,627
• Time in Patent Office: 1,705 Days
• Field of Search: 382/115, 382/116, 382/125, 382/128, 382/124, 382/181, 382/209, 382/117, 382/118, 382/119
• US Class Current: 382/125
• CPC Class Codes: G06T 7/33 using feature-based methods
• CPC Class Codes: G06V 40/1347 Preprocessing; Feature extraction
• CPC Class Codes: H01L 27/14825 Linear CCD imagers
• CPC Class Codes: H01L 27/14868 CCD or CID colour imagers

Abstract

The present invention can achieve the reliability and simplicity in registering a fingerprint by indicating the quality of a fingerprint image by the number of pseudo minutiae, improve the security of an entrance/exit control system to register a fingerprint, detect the direction of ridge lines of a fingerprint accurately as much as possible, improve the security in checking a fingerprint remarkably, collect renewed registered fingerprint data by a host device and hold the registered fingerprint data of each gate as the latest fingerprint data, improve the operability by enabling to use identification numbers having the less number of digits, and register a fingerprint having a high match rate by automatically applying spatial filtering in re-registering only. A fingerprint registering method according to the present invention detects normal minutiae and pseudo minutiae in a fingerprint pictured by a fingerprint image pickup unit, counts pseudo minutiae in registering windows with normal minutiae at almost the center, determines the average number of pseudo minutiae in registering windows from a total of pseudo minutiae in all registering windows, and registers a fingerprint when the average number of pseudo minutiae is equal to or below a threshold.

Claims

1. A fingerprint checking method which registers fingerprint data derived from extraction of minutiae from a fingerprint, checks said registered fingerprint data with fingerprint data for checking an affixed fingerprint, and authenticates personal identification if they match, wherein

a conversion key number is produced by a previously defined function from an entered key number and the content at a prescribed byte in said registered fingerprint data, said conversion key is inserted for storage, at a prescribed byte in said registered fingerprint data, and

a key number entered at the time of checking the fingerprint is checked with a key number reconstructed from said conversion key number inserted at the prescribed byte of said registered fingerprint data, and the checking fingerprint data obtained from the affixed fingerprint is checked with said registered fingerprint data.

2. The fingerprint checking method according to claim 1, wherein said entered key number and the content at the n-th byte of said registered fingerprint data are added or subtracted to produce a conversion key number, said conversion key number is inserted at the m-th byte of said registered fingerprint data to store in a file, the content at said n-th byte is subtracted or added with respect to said conversion key number inserted at the m-th byte in said registered fingerprint data at checking the fingerprint to reconstruct the key number, and said reconstructed key number is checked with the entered key number.

3. A fingerprint checking method for checking a fingerprint during a fingerprint registration process, which:

produces a conversion key number by computing a content d at n-th byte of a fingerprint data in a fingerprint registration data storing file and a key number set in a key number setting register with a function previously defined, in which the computing is done with a computing unit as one of an adder, a subtracter, a multiplier, and a divider, and

inserts said conversion key number at the m-th byte of the fingerprint data.