Edge processing system for color image processing system
First Claim
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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Abstract
An edge processing system for use in a color image processing device for reproducing images having a plurality of colors through its execution of repeated developing processes for the individual recording signals of the developed colors, comprises a low-pass digital filter for eliminating mesh dot components of the recording signals to smooth halftone images; a high-pass digital filter for detecting an edge part composed of high frequency components of the recording signals; a hue detector for detecting the hue of the recording signals to produce hue signals; an edge emphasizing signal generator for generating edge emphasizing signals according to the hue signals of the hue detecting means and the output signals of the high-pass digital filter; and a synthesizer for modulating and synthesizing the edge emphasizing signals and the output signals of the low-pass digital filter.
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Citations
15 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification