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Moving vector extractor

  • US 5,430,479 A
  • Filed: 10/16/1991
  • Issued: 07/04/1995
  • Est. Priority Date: 10/16/1990
  • Status: Expired due to Term
First Claim
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1. A moving vector extractor comprising:

  • a timer generating a control signal having a predetermined timing;

    an image processor for receiving an input image signal which represents a physical image and for generating, responsive to said control signal, a plurality of brightness signals which represent said physical image at a plurality of successive image frames;

    a representative point memory for extracting and storing representative points from said brightness signals according to said control signal generated by said timer, said representative points having corresponding brightness values;

    subtracting means for calculating a difference between said brightness values of said stored representative points which are in proximate image frames;

    absolute value calculating means for calculating an absolute value of said difference calculated by said subtracting means;

    density gradient calculating means for calculating a density gradient in a neighborhood of said representative points;

    weighting means for weighting said absolute value of said difference according to said calculated density gradient;

    accumulating means for accumulating said absolute value of said weighted difference;

    an accumulation memory for storing two-dimensionally an accumulated result obtained by said accumulating means corresponding to said input image signal;

    a minimum value detecting means for detecting a minimum value from accumulated results stored in said accumulating means; and

    moving vector extracting means for extracting a moving vector based on said detected minimum value.

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