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Character recognition apparatus and method for recognizing characters

  • US 6,327,384 B1
  • Filed: 11/13/1997
  • Issued: 12/04/2001
  • Est. Priority Date: 11/13/1996
  • Status: Expired due to Term
First Claim
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1. A character recognition apparatus that is used in performing coding of a pattern in accordance with the results of dividing a binary stationary image into patterns and performing pattern matching with respect to each of said divided patterns, said pattern extraction apparatus comprising:

  • projection means for projecting black pixels in said binary stationary image and determining a histogram thereof;

    document style determining means for determining, in accordance with said histogram, whether said binary stationary image is horizontally written text or vertically written text and for outputting a result of said determination of said document style determining means;

    means for extracting a block from said image in accordance with said determination result;

    pattern matching means for performing pattern matching operation by comparing said input pattern with a pattern as stored in a library;

    coding means for coding said input pattern into coded data depending upon an off-set data and a result of said pattern matching operation;

    means for extracting a pattern based on said block;

    means for making a joining judgment which determines whether or not said extracted pattern is extracted as a unitary character;

    means for joining extracted patterns in accordance with output from said means for making a joining judgment; and

    means for calculating a relative distance between a currently extracted pattern and an immediately previously extracted pattern, as an offset.

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