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Electronic image registration for a scanner

  • US 5,528,387 A
  • Filed: 11/23/1994
  • Issued: 06/18/1996
  • Est. Priority Date: 11/23/1994
  • Status: Expired due to Term
First Claim
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1. A system for electronically registering an image on an input document, comprising:

  • scanning means for generating an image data stream representing an electronic image of the image on the input document;

    edge detecting means, operatively connected to said scanning means, for detecting edge data within the image data stream;

    first corner detecting means, operatively connected to said edge detecting means, for detecting a first corner of a leading edge of the input document based on the detected edge data and for establishing a first coordinate value therefrom;

    center detecting means, operatively connected to said edge detecting means, for detecting a center of a leading edge of the input document based on the detected edge data and for establishing a second coordinate value therefrom;

    second corner detecting means, operatively connected to said edge detecting means, for detecting a second corner of a leading edge of the input document based on the detected edge data and for establishing a third coordinate value therefrom;

    skew means for calculating a skew angle of the input document based on the first, second, and third coordinate values; and

    rotation means for rotating the electronic image based on the calculated skew angle to register the electronic image with an output medium.

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