Image analysis – Histogram processing – For setting a threshold
Patent
1987-04-01
1989-03-28
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 5, 382 26, G06K 900
Patent
active
048171832
ABSTRACT:
Fingerprints are scanned by a scanning system (13). Topological systems for coding and comparing fingerprints are described including a system for recording a description of fingerprints. In a preferred embodiment, a central point of the fingerprint is selected as a center of rotating scan line. The scan line is rotated to different topological characteristics. A code (T) representing the type of irregularity is recorded (16, 17). A measure (M) of the scanning position when encountering the irregularity is made (16, 17). In the case of a rotating scan line the angular cordinate (.theta.) is recorded. The ridge count (R) (16) is also recorded. A list of coordinate sets (T, .theta., R) specifies the topology of a sector. For fragmentary prints similar coordinate sets are generated. A fourth coordinate can be added corresponding to the radial distance (D) (16). A full set of coordinates (T, .theta., R, D) gives a complete topological and spatial description of a fingerprint. Comparison of fingerprints can then be conducted by a computer (20).
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Sparrow, "Digital Coding of Single Fingerprints: A New Approach for the Computer Age", Journal of Police Science and Administration, vol. 10, No. 2, 1982, pp. 206-217.
Boudreau Leo H.
Mancuso Joseph
Zegeer Jim
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