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OCR image preprocessing method for image enhancement of scanned documents

  • US 5,594,815 A
  • Filed: 05/22/1995
  • Issued: 01/14/1997
  • Est. Priority Date: 10/19/1992
  • Status: Expired due to Term
First Claim
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1. A process for enhancing an image of a scanned document having boundaries, said image including a plurality of lines of textual matter, said plurality of lines potentially having at least one skew relative to the boundaries of said image, requiring registration, containing inverted text matter, undesired dots, and vertical and horizontal lines, said process comprisinga step for providing a primary scan line run-length coded image of said document;

  • a step for determining said skew;

    a step for reducing said skew;

    a step for determining said registration;

    a step for correcting said registration;

    a step for detecting said inverted text matter;

    a step for reversing said inverted text matter;

    a step for detecting said undesired dots;

    a step for deleting said undesired dots;

    a step for detecting said vertical lines;

    a step for eliminating said vertical lines;

    a step for detecting said horizontal lines;

    a step for eliminating said horizontal lines.

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