Patent ID: 6421458
Filing Date: 2002-07-16
Classification: G06K,G06T

Abstract:
A method for automated inspection of an object comprising:imaging an object to generate a run-time image; determining the affine pose of the run-time image with respect to an alignment model image, created from a plurality of training samples used to form a template, the alignment model image representing the object at a single predetermined orientation wherein said affine pose comprises parameters defining said object's orientation with at least four degrees of freedom; prefiltering the run-time image using a filter that reduces errors introduced by a subsequent affine transformation to generate a filtered image; transforming the filtered image with the affine pose to generate a transformed image; mean-correcting the transformed image with said template image to provide a mean-corrected image; comparing the mean-corrected image with a threshold image to produce an error image; and analyzing the error image to determine object status.