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Inspection method using unique templates and histogram analysis

  • US 5,204,911 A
  • Filed: 05/29/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 05/29/1991
  • Status: Expired due to Fees
First Claim
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1. A method for inspecting products which may have defects or marks and move on a production line, with the use of a sensor and a processing unit with a memory, comprising:

  • providing and saving in said memory a computer-generated artificial template image with a plurality of preselected gray levels;

    creating a histogram vector of said template image;

    creating a product image by sensing one of said products with said sensor,said product image comprising a multiplicity of pixels with intensity levels expressed as respective gray levels;

    modifying said product image to produce a modified product image by increasing the value of said gray levels of said product image by adding a constant value to all of said respective gray levels of said product image so as to make said gray levels of said modified product image higher than said grey levels of said template; and

    inspecting said product by superimposing said template image onto said modified product image, thereby creating a superposed image.

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