System for shape recognition

Details System for shape recognition System for shape recognition

1988-03-18

1990-02-27

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36472801, 364819, G06K 964

Patent

active

049052969

ABSTRACT:
A system for shape recognition includes a spatial convolution filter which has an approximately band pass response. The filter is applied to a camera image and the sign of the filter's output is used to produce a second binary image. At sufficiently coarse (low center spatial frequency) scales, this image tends to change isolated shapes into single blob-shaped regions. The same convolution operator is then reapplied to this binary signal blob image and peaks in the output of the second convolution are used as the primitive elements for building a shape description. By processing the image with operators of two different scales the peaks shift position. The location of peaks from the coarse scale operator together with vectors to the fine scale peaks provide a description of the shape for a look-up table or other system.

REFERENCES:
patent: 4472786 (1984-09-01), Larson
patent: 4532548 (1985-07-01), Zwirn
patent: 4685071 (1987-08-01), Lee

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