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Edge processing system for color image processing system

  • US 5,032,903 A
  • Filed: 10/19/1989
  • Issued: 07/16/1991
  • Est. Priority Date: 10/20/1988
  • Status: Expired due to Fees
First Claim
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1. An edge processing system for use in a color image processing device for reproducing an image, said image comprising halftone or binary value images and having a plurality of colors, by repeatedly executing a copying process to produce recording signals, said edge processing system comprising:

  • a low-pass digital filter for eliminating mesh dot components of said recording signals to smooth halftone images;

    a high-pass digital filter for detecting high frequency components of said recording signals to detect an edge portion of said image;

    means for detecting a hue of said image from said recording signals to produce hue signals;

    means for generating edge emphasizing signals in accordance with said hue signals and output signals of said high-pass digital filter; and

    means for modulating and synthesizing said edge emphasizing signals and output signals of said low-pass digital filter to emphasize color components of said image that are necessary to define said edge portion and to attenuate color components that are unnecessary to define said edge portion.

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