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Image processing apparatus capable of obtaining multi-level data

  • US 5,121,446 A
  • Filed: 07/16/1991
  • Issued: 06/09/1992
  • Est. Priority Date: 02/10/1989
  • Status: Expired due to Term
First Claim
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1. An image processing apparatus, comprising:

  • an input means for inputting data on an object pixel;

    an calculation means for calculating an average density value of a predetermined area; and

    a quantization means for converting the data on the object pixel into multi-level data on the basis of the average density value obtained by said calculation means,wherein said calculation means calculates the average density value of the predetermined area using multi-level data produced previously by said quantization means.

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