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Optical interprogation system for use in constructing flat tension shadow mask CRTS

  • US 5,145,432 A
  • Filed: 11/27/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 11/27/1991
  • Status: Expired due to Fees
First Claim
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1. An apparatus for interrogating at least one CRT workpiece, comprising;

  • a) a plurality of video cameras placed in known locations, the cameras each having a field of view on at least one CRT workpiece;

    b) means for representing each field of view as a series of pixels;

    c) means for valuing each pixel in a single-bit image value;

    d) processor means for serially comparing each camera'"'"'s series of pixel image values in parallel to determine where transitions take place between pixel image values for each camera;

    e) means for filtering the transition locations to determine where desired features in the fields of view occur.

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