Patent Document ID: 5495535
Application ID: 08122507
Patent Status: 1

Claim One:
1. A method of inspecting an article with respect to a list of reference features each identified by its coordinate location, comprising: scanning the article to generate online data, identifying detected features and their coordinates detected during the scanning of the article; transforming the coordinates of the detected features according to registration transformation parameters to correct for global misregistration of the article; and comparing the transformed coordinates of the detected features with those of the reference features for matches; said registration transformation parameters of the overall article being determined by: scanning an initial area of the article; generating for said initial area, a list of said detected features with their coordinates; pairwise matching said detected features and their coordinates with said reference features and their coordinates for said initial area; computing an initial estimate of optimal registration transformation parameters required to minimize disparities between said pairwise matched detected and reference features in said initial area according to a misregistration transformation model; and dynamically improving said initial estimate of the optimal transformation parameters by progressively increasing the scanned area of said article and progressively updating said initial estimate of the optimal transformation parameters according to said misregistration transformation model to provide optimal registration for the detected and reference features with respect to the complete area scanned.