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Feature extraction system for identifying text within a table image

  • US 5,848,186 A
  • Filed: 08/11/1995
  • Issued: 12/08/1998
  • Est. Priority Date: 08/11/1995
  • Status: Expired due to Term
First Claim
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1. In a feature extraction system for analyzing image data of an input document image, a method for identifying image data as a table image and for identifying text within the table image, the method comprising the steps of:

  • inputting image data of a document page;

    performing block selection processing on the image data, said block selection processing identifying and separating the image data into blocks having the same image type;

    identifying table image data based on the separated blocks of image data;

    identifying text blocks within the table image data;

    horizontally sorting each text block located in the table image data in relation to each other text block located in the table image data based on horizontal position information;

    vertically sorting each text block located in the table image data in relation to each other text block located in the table image data based on vertical position information;

    calculating rows and columns based on a result of the vertical and the horizontal sorting steps;

    assigning a column address and a row address to each text block in the table image data based on the calculating step; and

    storing the assigned addresses of each text block.

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