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Motion detection camera

  • US 20040028137A1
  • Filed: 06/12/2003
  • Published: 02/12/2004
  • Est. Priority Date: 06/19/2002
  • Status: Abandoned Application
First Claim
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1. A method for detecting motion in an area, from first and second digital images of that area, comprising the steps of:

  • identifying in a first image, at least one cell and determining a cell gradient value by;

    subdividing a first cell into first and second halves having equal numbers of pixels;

    obtaining for each pixel, a value;

    adding the values in the first half to reach a first sum;

    adding the values in the second half to reach a second sum;

    subtracting the first and second sums to calculate a difference;

    adding the first and second sums to calculate a denominator;

    dividing the difference by the denominator to result in the first cell gradient value;

    identifying the first cell in the second image and determining a second cell gradient value in accordance with the steps for determining the first cell gradient value;

    obtaining an absolute difference between the first and second cell gradient values to produce a motion index;

    comparing the motion index to a threshold value, so that motion is deemed to have occurred when the index equals or exceeds the threshold value.

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