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Method for performing character recognition on a pixel matrix

  • US 5,825,923 A
  • Filed: 09/05/1996
  • Issued: 10/20/1998
  • Est. Priority Date: 09/05/1996
  • Status: Expired due to Term
First Claim
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1. A method for recognizing ciphers, said method comprising the steps of:

  • inputting a digital representation of a cipher, along with a bits-to-pixel ratio of said digital representation, the number of pixels per row of said digital representation, the number of rows in said digital representation, and an indicator which represents a block boundary condition of said digital representation;

    transforming said digital representation so that each individual pixel of image information is represented by an addressable data block;

    smoothing said transformation;

    locating enclosures in said smoothed transformation, said enclosures defining spatial boundaries;

    sizing said smoothed transformation, resulting in selected erased enclosures;

    restoring all erased enclosures in said sized transformation;

    normalizing said enclosure-restored transformation so that stray marks are erased, to form a normalized image;

    thinning said normalized image;

    storing said thinned image in a sparse space matrix;

    locating significant features in said thinned image;

    quantizing location of said significant features; and

    performing database searches using said quantized values as search keys to identify ciphers associated with said search keys.

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