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Table recognition apparatus

  • US 5,708,730 A
  • Filed: 06/07/1995
  • Issued: 01/13/1998
  • Est. Priority Date: 10/27/1992
  • Status: Expired due to Term
First Claim
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1. A table recognition apparatus for recognizing a table image having both a character image and a ruled line image, said table recognition apparatus comprising:

  • image separating means for separating characters from ruled lines in said table image;

    means for acquiring a rectangular area containing a character in the character image;

    means for producing a threshold from the dimensions of said acquired rectangular area;

    character block extracting means for using said threshold to extract character blocks from the character image separated by said image separating means;

    first character block extending means for extending each of said character blocks up to the nearest one of the ruled lines;

    means for computing a horizontal and a vertical distribution of character blocks to keep each extended character block from overlapping with other ones of the character blocks;

    second character block extending means for further extending the extended character blocks to align the edges of the extended character blocks;

    row extracting means for extracting rows of said table image based on the distance between the extended character blocks; and

    column extracting means for extracting columns of said table image based on the distance between the extended character blocks.

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