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Apparatus for preprocessing of character recognition

  • US 4,809,344 A
  • Filed: 05/11/1987
  • Issued: 02/28/1989
  • Est. Priority Date: 05/11/1987
  • Status: Expired due to Fees
First Claim
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1. An apparatus for preprocessing of character recognition comprising:

  • dividing means for dividing an area within a page into a plurality of areas,multiplying means for multiplying one of the plurality of areas into a plurality of images,feature extracting means for extracting features of said one of the plurality of means by optically detecting the presence or absence of a correlation between each of pairs of the plurality of images and a plurality of different masks,a plurality of photosensor arrays each of which has a plurality of aligned light-receiving elements having different alignment directions and being respectively paired with the plurality of images,first and second image sensors for reading lines and characters within the page in a predetermined scanning direction;

    moving means for moving relatively the characters and said first and second image sensors in a direction different from the scanning direction;

    calculating means for calculating a size of the characters along a moving direction on the basis of an output from said first image sensor; and

    control means for controlling a scanning frequency of said second image sensor on the basis of the size of the characters calculated,wherein each said one of the areas within the page is divided until each said one of the plurality of areas as directed has a single feature, and a beam from each said one of the plurality of areas with a single feature is incident on said plurality of photosensor arrays,the lines and the characters in each said one of the plurality of areas as divided are separated on the basis of a density distribution represented by detection outputs form said light-receiving elements, andeach of the characters as separated is normalized by said second image sensor along the predetermined scanning direction.

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