A Multilevel Error Diffusion Method by Restricting Quantization Error

Abstract

The error diffusion method creates high-quality dithered pictures. It can be expanded to multilevel dither processing. However, the multilevel error diffusion method causes picture quality deterioration around middle quantization level. Some studies are reported to solve this problem. However, the previous methods have complicated algorithm and may not be most suitable method. This paper proposes a error diffusion method which resolve the problem by the restricting quantization errors to small value. It also shows that high quality picture of multilevel error diffusion method can be obtained.