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Automated inspection of objects undergoing general affine transformation

  • US 6,421,458 B2
  • Filed: 08/28/1998
  • Issued: 07/16/2002
  • Est. Priority Date: 08/28/1998
  • Status: Expired due to Term
First Claim
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1. 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.

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