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Method and system for document segmentation

  • US 6,904,170 B2
  • Filed: 05/17/2002
  • Issued: 06/07/2005
  • Est. Priority Date: 05/17/2002
  • Status: Active Grant
First Claim
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1. A method of document segmentation comprising:

  • a) generating a plurality of projection profiles of pixel intensities for a document containing a plurality of text lines including a plurality of text lines of a first type and a plurality of text lines of a second type over a range of angles;

    b) calculating a plurality of slope values of said plurality of projection profiles for a plurality of discrete distances perpendicular to said range of angles;

    c) sorting out a set of maximum absolute slope values of said plurality of slope values; and

    d) identifying text lines of said first and second type by setting a threshold slope value wherein absolute slope values greater than said threshold slope value indicate said plurality of text lines of said first type, and absolute slope values less than said threshold slope value indicate said plurality of text lines of said second type.

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