Title: Fingerprint identification by ridge angle and minutiae recognition

Abstract: A raster scanning laser beam and cooperating light detector generate a stream of binary coded data, which data are processed to yield an organized binary pattern of ridge angle data. Location of secondary data representing only one side of the fingerprint ridges is then accomplished and that data is locally stored. As a further descriptor of the print, non-paired ridge endings are identified. While retaining the advantages inherent in ridge angle processing for identification, the recognition system makes use of non-paired selected line end minutiae data as a fine descriptor, comparing the location of such minutiae with respect to predetermined points of the fingerprint pattern, so affording a final assessment of match validity.

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Other info:

Inventors: McMahon, Donald H. (Carlisle, MA, US)

Application Number: 910810
Filing Date: 1978-05-30
Publication_date: 1980-06-17
Assignee: Sperry Corporation (New York, NY)
Primary Class(es): 382/125 382/197
Other Classes:
US Patent Ref:

3271761	Sep, 1966	Kuang-Chi Hu	340/146.
3582889	Jun, 1971	Bodez	340/146.
3585592	Jun, 1971	Kiji et al.	340/146.
3786416	Jan, 1974	Bhimani	340/146.
3968475	Jul, 1976	McMahon	340/146.
4003024	Jan, 1977	Riganati et al.	340/146.
4015240	Mar, 1977	Swonger et al.	340/146.
4083035	Apr, 1978	Riganati et al.	340/146.
4087788	May, 1978	Johannesson	340/146.

Other Refs:
Primary Examiner: Boudreau, Leo H.
Assistant Examiner:
Attorney: Terry; Howard P.