一种改进的查找表逆半调算法  

A Developed Lookup Table Inverse Halftoning Algorithm

作　　者：刘晓虹[1] 孔月萍[1] 

机构地区：[1]西安建筑科技大学

出　　处：《计算机技术与发展》2007年第4期239-242,共4页Computer Technology and Development

基　　金：陕西省自然科学基金项目(2004F32);陕西省教育厅专项科研计划项目(04JK244)

摘　　要：边缘和平滑区域是图像的重要组成部分,人眼对边缘特征和平滑区域的噪声比较敏感。文中提供了一种改进的查找表逆半调算法,该算法在查找表逆半调算法的基础上考虑了边缘在图像处理中的作用,并对图像边缘分类,然后,按照半调图及图像边缘的类型重构连续色调图像。通过由误差分散类半调图构成的不同频率特征的训练集、测试集进行实验,表明当训练集为平滑图像集时基于边缘的查找表逆半调算法处理平滑图像,在主、客观评价方面的效果都好于查找表逆半调算法处理的图像;而改进的方法在处理细节图像时与查找表逆半调算法相比没有优势。The edges and the smooth areas are important for images. The eyes of people are more sensitive to them. Providing a developed lookup table inverse halftoning algorithm, it regards the edges as one condition for reconstruction of images and edges are classified according to their form. The inverse halftoning experiment basing on three kinds of gray image sets shows that the inverse halftone images of this method in smooth areas is better than published lookup table technique, while in high frequency areas it is approximate to the result of lookup table inverse halftoning.

关 键 词：逆半调 查找表 边缘模式 

分 类 号：TN911.73[电子电信—通信与信息系统]