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Machine vision system with illumination variation compensation

  • US 4,855,830 A
  • Filed: 03/30/1987
  • Issued: 08/08/1989
  • Est. Priority Date: 03/30/1987
  • Status: Expired due to Term
First Claim
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1. A programmable controller for operating a machine, said controller including a vision input system comprising:

  • means for receiving a video signal representing a video image of an object to be processed by the machine;

    means for measuring the luminance of the video signal for a portion of said video image;

    means, responsive to said means for measuring, for establishing a luminance threshold;

    means for digitizing the video image by employing the luminance threshold; and

    means for analyzing characteristics of the digitized image to generate data for use in operating the machine.

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