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Apparatus for measuring velocity of a moving image or object

  • US 4,580,894 A
  • Filed: 06/30/1983
  • Issued: 04/08/1986
  • Est. Priority Date: 06/30/1983
  • Status: Expired due to Fees
First Claim
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1. Apparatus for measuring the velocity of a moving image or object comprising:

  • a first array of sensors extending in a first direction transverse to image motion for sensing a primary set of image elements;

    a second array of sensors extending generally in said first direction and spaced a known distance from said first array for sensing successive sets of image elements;

    means for correlating said primary set of image elements with each of said successive sets of image elements and producing a correlation level indicating the level of correlation of said primary set with each of said successive sets, said means for correlating including means for comparing with said primary set each said successive set in a plurality of different positions along said first direction and for producing a comparison level indicating the level of comparison of said primary set with said successive set in each of said different positions;

    means for selecting one of said correlation levels which indicates an optimum level of correlation; and

    means for determining the time interval between the sensing by said first array of said primary set and the sensing by said second array of said successive set corresponding to said selected correlation level.

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