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The Error Diffusion Halftoning Using Local Adaptive Sharpening Control  

곽내정 (충북대학교 정보통신공학과)
양운모 (한솔 LCD 연구)
윤태승 (충북대학교 정보통신공학)
안재형 (충북대학교 정보통신공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.41, no.4, 2004 , pp. 87-92 More about this Journal
Abstract
Digital halftoning is to quantize a grayscale image to binary image. The error diffusion halftoning generates high quality bilevel image. But that also has some defects such as warms effect, sharpening and etc. To reduce these defects, Kite proposed the modified threshold modulation that has a parameter to control sharpening. Nevertheless some degradation left near edges with large luminance change. In this paver, we propose a method to control the parameter in proportional to local edge magnitude. The results of computer simulation show more reductions of the sharpening in the halftone image. Especially there are great improvement of quality near edges with large luminance change.
Keywords
halftone; error diffusion; delta-sigma modulation; binary image;
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