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Key character extraction and lexicon reduction for cursive text recognition

  • US 6,249,605 B1
  • Filed: 09/14/1998
  • Issued: 06/19/2001
  • Est. Priority Date: 09/14/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a method for identifying key characters in cursive text, performing tasks comprising:

  • identifying a sequence of graphemes (G=(GR1, GR2, . . . GRn)) in an image;

    identifying in the sequence of graphemes, a plurality of segments Sij=(GRi[1], GRi+1, . . . GRi+j−

    1
    , wherein iε

    {1, . . . , n}, jε

    {1, . . . , m}, and i+j−

    1≦

    n;

    calculating, for each of a plurality of characters, a level of confidence chx(Sij) that at least one of the segments (Sij) represents a particular character of the plurality of characters;

    ascertaining the maximum value m(Sij) of chx(Sij) for the plurality of characters for at least one of the segments (Sij);

    determining if m(Sij) is greater than a threshold T for each segment (Sij) for which m(Sij) is ascertained; and

    determining if m(Sij)>

    m(Skl)+d, ∀

    Skl;

    Sij

    Skl

    0, and Skl

    Sij for each segment (Sij) for which m(Sij) is ascertained, wherein Skl comprises an environmental measure of said segment Sij and dε

    {1, . . . , 100}.

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