Image analysis – Applications – Manufacturing or product inspection
Patent
1995-02-22
1998-12-15
Rogers, Scott
Image analysis
Applications
Manufacturing or product inspection
382218, 382295, 382296, 382298, G06K 968, G06T 320, G06T 340, G06T 360
Patent
active
058504664
ABSTRACT:
A method for Golden Template Comparison (GTC) is provided that can be used to efficiently perform flaw and defect detection on a two-dimensional test image that is at least rotated and/or scaled and/or sub-pixel translated. Run-time inspection speed and accuracy is substantially improved by retreiving a golden template image that is rotated and/or scaled and/or translated in a manner substantially similar to the test image. This is accomplished by storing, in an array, a varied plurality of golden template images, each golden template image being characterized by a different combination of at least rotation and/or scale and/or sub-pixel translation. The array is indexed by the respective quantized rotation and/or quantized scale and/or sub-pixel translation of each version of the golden template image. The array can be either one-dimensional or multi-dimensional. At run-time, the values of the rotation and/or scale and/or sub-pixel translation of each test image are measured, and then quantized, thereby providing a unique index into the multi-dimensional array of reference and threshold images. The reference and threshold images stored at the memory location corresponding to the index are retrieved and then used for comparison with the test image to provide a difference image to be analyzed for flaws or defects.
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patent: 4809341 (1989-02-01), Matsui et al.
patent: 5046109 (1991-09-01), Fujimori et al.
Silver, W.M., and Schott, J-P, "Practical Golden Template Comparison", Proceedings of International Automation Conference, Detroit MI; Jun. 6, 1990.
William M. Silver; Golden Template Comparison; Oct. 1990; Sensors; pp. 20-26.
Cognex Corporation
Rogers Scott
Weinzimmer Russ
Werner Brian P.
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