改善等离子体显示器动态假轮廓的显示灰度级调整方法  

A Method of Modifying Display Gray Levels for Reducing the Dynamic False Contour in Alternating Current Plasma Display Panel

作　　者：王志国[1] 刘纯亮[1] 梁志虎[1] 

机构地区：[1]西安交通大学电子物理与器件教育部重点实验室,西安710049

出　　处：《西安交通大学学报》2009年第10期89-93,共5页Journal of Xi'an Jiaotong University

基　　金：国家高技术研究发展计划资助项目(2008AA03A309)

摘　　要：为了改善交流等离子体显示器(ACPDP)动态假轮廓现象,提出了一种显示灰度级调整方法.首先利用ACPDP实际采用的子场编码,通过运动图像畸变距离方法对动态假轮廓进行量化,然后选取不易产生动态假轮廓的灰度级作为输出显示灰度级.同时,采用数字半色调技术增强输出图像质量.一方面,采用就近阈值化的误差扩散方法有效地减小了量化误差较大时的误差扩散噪声;另一方面,利用有序抖动方法处理低灰度级像素,从而使得运动图像既不易被察觉出动态假轮廓现象,又能在整个灰度级范围内产生较好的显示效果.将提出的方法应用于81cm AC PDP中,实验结果表明,在不影响AC PDP显示画质的前提下,有效地缩减了动态假轮廓现象.A method of modifying display gray levels is proposed to reduce the dynamic false contour （DFC） in alternating current plasma display panel （AC PDP）. The sub-field coding adopted in AC PDP is utilized to give a quantitative measure of the DFC by the motion picture distortion （MPD） distance method. Then, the gray levels in which the DFC is not observed are displayed. At the same time, the quality of the output image is enhanced by the digital halftoning technology. The noises generated by bigger quantified errors can be reduced effectively by the error diffusion method with accepting the nearest threshold. On the other hand, the pixels with the lower grayscale are processed by the ordered dithering method. Consequently, the DFC in the moving images can not be observed and the images are represented better in the whole grayscale scope. The proposed method is applied to an 81 cm AC PDP and experimental results show that the DFC in the moving images is reduced effectively under the premise that the image quality in AC PDP is not affected.

关 键 词：交流等离子体显示器 动态假轮廓 数字半色调 误差扩散 有序抖动 

分 类 号：TN873.94[电子电信—信息与通信工程] TN911.73