Machine vision methods and system for boundary point-based comparison of patterns and images
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United States of America Patent
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Apr 30, 2002
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app pub date -
Dec 18, 1998
filing date -
Dec 18, 1998
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Abstract
The invention provides boundary-based machine vision methods and systems for comparing a pattern to an image. These contemplate the steps of finding boundary points in the image and comparing those points with boundary points in the pattern to identify 'matches,' i.e., boundary points in the image that match boundary points in the pattern, 'extras,' i.e., boundary points in the image which do not match boundary points in the pattern, and 'missing,' i.e., boundary points in the pattern that do not match boundary points in the image. Quantitative and/or qualitative information about matching, extra or missing points can be generated, including the differences between the locations, angles and contrasts of each boundary point in the image and the corresponding boundary point in the pattern.
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