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Method and unit for binary processing in image processing unit and method and unit for recognizing characters

  • US 5,825,920 A
  • Filed: 12/22/1992
  • Issued: 10/20/1998
  • Est. Priority Date: 01/28/1991
  • Status: Expired due to Fees
First Claim
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1. A character recognition unit:

  • comprising a frame memory circuit changing an image picked-up signal which is obtained by horizontally and vertically scanning a character string to be recognized into binary data, changing the binary data into picture elements and storing the picture elements;

    address designation means for designating an address of said frame memory, scanning the picture elements stored in said frame memory from said address in a predetermined direction and reading the stored pictures;

    projection pattern extraction means for extracting a projection pattern comprised of a number of picture elements expressing said character string of picture elements read out by said address designation means;

    projection width extraction means for obtaining a projection width, said projection width comprised of at least one of a number of scanning lines and a width of scanning lines, when a projection value of said projection pattern is not "0";

    distortion angle detection means for gradually changing direction of said scanning lines to obtain a scanning direction as a distortion angle when said projection width becomes a minimum;

    means for separating each picture element from said character string;

    correction means for correcting only one of horizontal direction component and vertical direction component of each of at least one of the character data and dictionary data corresponding to each character;

    recognition means for recognizing characters by comparing at least one of the corrected character data and corrected dictionary data with at least one of the non-corrected dictionary data and the non-corrected character data; and

    means for obtaining a distortion angle of said character string such that there are three scanning directions of θ

    1, θ

    2, and θ

    3, projection widths obtained in said respective directions are xd(θ

    1), xd(θ

    2), and xd(θ

    3), which are applied to an expression of xd(θ

    )=aθ

    +bθ

    +c, and a value of θ

    which takes a minimum value in said quadratic curve is selected as said distortion angle.

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