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Method and system for detecting a flaw in a sample image

  • US 6,295,374 B1
  • Filed: 04/06/1998
  • Issued: 09/25/2001
  • Est. Priority Date: 04/06/1998
  • Status: Expired due to Term
First Claim
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1. A method for detecting a flaw in a sample image of an object in a machine vision system including a camera and a computer, the method comprising the steps of:

  • a) creating a template image of the object;

    b) registering the template image and the sample image;

    c) subtracting the template image from the sample image to provide an error image of the sample image after performing step b);

    d) analyzing the error image to identify at least one region of error of the sample image;

    e) creating an individual final sample sub-image of the sample image at each identified region of error;

    f) creating an individual final template sub-image of the template image at each identified region of error of the sample image;

    g) registering each individual final template sub-image and each corresponding individual final sample sub-image;

    h) subtracting each final template sub-image from each corresponding final sample sub-image to provide a final error image for each final sample sub-image;

    i) analyzing the final error image for each final sample sub-image to identify a final sample sub-image region of error for each final sample sub-image; and

    i) identifying each final sample sub-image region of error as the flaw.

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