Image analysis – Applications – Manufacturing or product inspection
Patent
1994-10-26
1999-12-14
Couso, Yon J.
Image analysis
Applications
Manufacturing or product inspection
382197, 382168, G06K 900
Patent
active
060027932
ABSTRACT:
A machine vision system for finding an angle object orientation, or other characteristic, of an object in an image. The system determines the boundary pixels, determines the segment orientation angles associated with each successive segment of n boundary pixels, assigns a weight to each angle, generates a histogram of the angles according to their weights, normalizes the histogram to an angle range covering 90.degree., and generates a signal representing the angle corresponding to a selected peak in the histogram. In one embodiment, the system interpolates between neighboring pixels across the boundary to obtain a grey-scale boundary of sub-pixel accuracy.
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Foster Nigel J.
Marrion Jr. Cyril C.
Silver William M.
Cognex Corporation
Couso Yon J.
Powsner David J.
Weinzimmer Russ
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