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Correlation techniques

  • US 4,925,274 A
  • Filed: 12/30/1988
  • Issued: 05/15/1990
  • Est. Priority Date: 01/22/1987
  • Status: Expired due to Term
First Claim
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1. A method of forming a correlation array for a target within a viewed scene, the method comprising the steps of:

  • (a) forming a reference array containing the target;

    (b) forming a scene array corresponding to the viewed scene;

    (c) scanning the scene array with the reference array and determining a minimum value of (W/S, S/W) for each pixel pair of the scene and reference arrays, where W and S are pixel values of the reference array and scene array, respectively;

    (d) summing the minimum values obtained to form a cumulative total for each pixel of the scene array;

    (e) applying a conditional threshold value to the cumulative total to determine similarity and dissimilarity between the reference and scene arrays; and

    (f) assigning a value of zero or one to the correlation array corresponding to whether its associated pixel in the scene array was found to be dissimilar or similar, respectively.

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