Image analysis – Histogram processing – For setting a threshold
Patent
1989-02-07
1991-02-19
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 32, G06K 974, G06K 938
Patent
active
049950908
ABSTRACT:
A system for comparing a subject image against a reference image for determining the closeness of match, or against a plurality of reference images for determining the one of the reference images which corresponds to the closest match. The closest match is determined in response to the extrema of light transmitted through complementary versions of the images. More specifically, the present system compares the true subject image against the complement of each reference image, and the complement of the subject image against each true reference image. Alternatively, the true subject image is compared against each true reference image, and the complement of the subject image against each complement reference image. The particular reference image which achieves a preselected minimum or maximum of transmitted light for each such comparison is selected as the image which most closely matches the subject image. The comparison scheme is useful in comparing very large images by comparing only preselected image portions at one time. The comparisons can be achieved using transparencies of the subject and reference images, and their complements. Alternatively, the comparisons can be performed on a pixel-by-pixel basis, using arbitrarily small pixels, in a video embodiment. Any combination of the subject and the reference images can be generated as video images, either from a recording or in real time, using the outputs of video cameras.
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Hong Song-cheol
Singh Jasprit
Boudreau Leo H.
Cammarata Michael R.
The University of Michigan
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