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Method and apparatus for producing binary picture with detection and retention of plural binary picture blocks having a thin line pattern including an oblique line

  • US 5,121,222 A
  • Filed: 08/01/1991
  • Issued: 06/09/1992
  • Est. Priority Date: 06/14/1989
  • Status: Expired due to Fees
First Claim
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1. A binary picture reducing method comprising:

  • a first step of dividing an original picture into blocks each having a pattern matrix composed of a predetermined number of picture elements for extracting a plurality of binary picture blocks;

    a second step wherein, when individual blocks of the plurality of binary picture blocks each agree with a predetermined thin line pattern including an oblique line, detecting each individual binary picture block as a thin line block; and

    a third step wherein each thin line block detected is retained on an output picture at a position corresponding to a predetermined reduction ratio.

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