Communications: electrical – Digital comparator systems
Patent
1977-01-25
1978-02-21
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
250226, 3401463B, 356 71, G06K 900
Patent
active
040756041
ABSTRACT:
Method and apparatus for real time recognition of test images by comparison with sample images. The test image to be recognized is scanned to produce a plurality of analog signals of the luminance levels. These luminance signals are screened to eliminate background signals and are converted to digital signals. A distribution function of the occurrence frequency versus the luminance level is determined from the test image signals. Typical parameters of said distribution function are calculated and compared with sets of stored corresponding parameters derived in a similar manner from known reference sample images. A recognition signal is outputted to indicate the sample image which most closely resembles the test image as determined by said comparison, provided that the quantitatively determined differences between test and sample images are below a predetermined threshold value.
REFERENCES:
patent: 3705383 (1972-12-01), Frayer
patent: 3805239 (1974-04-01), Watanabe
patent: 3829218 (1974-08-01), Alyanak
patent: 3858044 (1974-12-01), Frappe
patent: 3930230 (1975-12-01), Stephens
patent: 3935562 (1976-01-01), Stephens
patent: 3999047 (1976-12-01), Green
Boudreau Leo H.
Tasco S.p.A.
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