Fingerprint correlation system with parallel FIFO processor
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United States of America Patent
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Oct 1, 1991
Grant Date -
N/A
app pub date -
Jul 20, 1990
filing date -
Jul 20, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for parallel processing 'live' and pre-recorded 'reference' fingerprint data for comparison purposes. An array sensor images a selected portion of a live fingerprint and video means produce corresponding digital live image data. The pre-recorded, multi-pixel reference data and the image data are scanned relative to one another via recirculating First-in-First-Out (FIFO) buffer memories and row and column shift means. Exclusive OR (XOR), summation and accumulation circuitry simultaneously compare the reference and image data over a plurality of correlation cycles and compute a correlation value for each correlation cycle. A microprocessor determines the best correlation value of the reference and image data from a tabular store of correlation values for each correlation cycle relative to a PASS/FAIL threshold.
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