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PREPROCESSING METHOD AND APPARATUS FOR PATTERN RECOGNITION

  • US 3,636,513 A
  • Filed: 10/17/1969
  • Issued: 01/18/1972
  • Est. Priority Date: 10/17/1969
  • Status: Expired due to Term
First Claim
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1. The method of preprocessing information contained in an image to permit classification of an unknown pattern that may be present within said image relative to a set of reference pattern classes, which comprises:

  • accepting certain points within the image of substantial information-bearing character as image points for the extraction from the image of features of any patterns contained within the image. taking measurements with respect to acceptable image points, said measurements being chosen to be invariant regardless of orientation, scale, and position of any pattern associated with each such image point, and extracting as features of said pattern the values of said invariant measurements together with sufficient data to establish the geometrical relationship between the accepted image points, for comparison with similarly determined features in each of the reference pattern classes.

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