Method of inspecting articles
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United States of America Patent
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Feb 27, 1996
Grant Date -
N/A
app pub date -
Sep 24, 1993
filing date -
Jan 31, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of inspecting an article with respect to a stored list of reference features by scanning the article to detect online features, transforming their coordinates according to registration transformation parameters to correct for misregistration of the article, and comparing the transformed coordinates of the online features with those of the stored reference features for matches. According to this method, an initial estimate of the required registration transformation parameters is provided and is dynamically improved by continuously computing and periodically updating the estimate from the coordinates of the online features detected during the scanning of the article and the coordinates of the stored reference features.
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