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Character recognition system

  • US 3,970,991 A
  • Filed: 11/06/1974
  • Issued: 07/20/1976
  • Est. Priority Date: 11/08/1973
  • Status: Expired due to Term
First Claim
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1. A character recognition system for recognizing a character pattern on a character document having an actual character area including four peripheral sections corresponding to the respective four sides of the character pattern including character line portions and a blank area surrounding the actual character area comprising:

  • scanning means for scanning the character documents to generate character pattern analogue signals;

    binary coding means for converting the character pattern signals from the scanning means into a plurality of character pattern digital signals including digital signals constituting four peripheral information units corresponding to the four peripheral sections, each of the four peripheral information units including at least one continuous digital signal train corresponding to the length of the character line portion;

    memory means for storing the character pattern binary coded digital signals obtained from the binary coding means;

    pattern framing means for framing the actual character area of the character document on the basis of the character pattern binary coded digital signals stored in the memory means;

    peripheral pattern information unit pick-up means for reading out from the memory means the four peripheral information units in accordance with the framing data from the character pattern framing means;

    length information detecting means for detecting the continuous digital signal train included in each of the four peripheral information units to code the digital signal train into a length information code;

    a storage section for storing a plurality of character groups each including a plurality of different characters;

    an address selection circuit addressing a corresponding character group to the character being recognized from the storage section in accordance with the four length information codes corresponding to the four peripheral information units; and

    recognizing means for recognizing the character being recognized from a plurality of different characters included in the detected character groups.

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