Methods and apparatus for scanning objects and generating image information

  • US 5,144,421 A
  • Filed: 04/23/1992
  • Issued: 09/01/1992
  • Est. Priority Date: 12/24/1954
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for scanning an object and generating image information about the object, comprising:

  • a) generating a radiation beam;

    b) controlling said radiation beam to cause it to scan a plurality of paths intersecting an object positioned in an image field, said object containing a predetermined image area having variable scannable information including abrupt changes in light reflectivity, so that light energy is variably reflected during at least part of the scanning movement of said beam, and wherein said plurality of paths scanned by said radiation beam cover an area in said image field which is larger than said predetermined image area;

    c) detecting variations in the reflected light energy of said beam as it scans said object in said image field, and generating electrical detection signals which are modulated in accordance with said variations in the reflected light energy of at least a portion of said image field including said predetermined image area;

    d) electronically processing said electrical detection signals and generating electrical control signals;

    e) computer analyzing said electrical control signals and generating coded electrical signals defining at least a portion of the variable scannable information detected during at least one of said scanning paths intersecting said predetermined image area; and

    f) employing said coded electrical signals to control the operation of an indicating means to cause it to indicate the detected variable scannable information in said predetermined image area.

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