METHOD OF INSPECTING ARTICLES

摘要

A method of inspecting an article (1) with respect to a stored list of reference features (6) by scanning the article to detect online features (5), transforming their coordinates according to registration transformation parameters to correct for misregistration of the article, and comparing (7) 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 (1) and the coordinates of the stored reference features (6).