基于双向反馈及HVS模型的误差扩散算法  

Error Diffusion Algorithm Based on Bidirectional Feedback and HVS

作　　者：孟祥敏[1] 侯德文[1] 

机构地区：[1]山东师范大学信息科学与工程学院,济南250014

出　　处：《信息技术与信息化》2009年第6期55-59,共5页Information Technology and Informatization

摘　　要：针对传统误差扩散中的"龟纹"和"伪轮廓"现象,在基于标准误差扩散算法的基础上,提出一种基于双向反馈的误差扩散半色调算法。它不仅在误差扩散后的高频和低频成分中依据HVS模型加入了中间频带,使图像更趋于均匀和柔和,并且根据领域图像灰度特征和HVS特征动态修改误差扩散滤波器系数,尽可能的克服了由于固定系数扩散所产生的方向性纹理缺陷。This paper proposes error diffusion algorithm based on bidirectional feedback which aims at reducing distortions and false contourint roduced by traditional error diffusion. The algorithm not only makes output bi - level image well - proportioned and mellow by importing intermediate frequency components based on HVS to output image which consists of high - frequency compo- nents and low -frequency components after error diffusion , but al so intelligently amend error diffusion flier coefficient s based on the characteristics of local grey level and HVS. The algorithm faultlessly solves directional artificial texture caused by fixed error dif- fusion coeffiients.

关 键 词：数字半色调 误差扩散 HVS模型 双向反馈 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]