Dithers combined with minor pixel separation for gray-scale enhancement
王耀功 WANG Yaogong, 张小宁 ZHANG Xiaoning, 屠震涛 TU Zhentao, 黄金福 HUANG Jinfu · Optical Technique · 2012
In order to improve the gray-scale loss caused by anti-γ correction and limited gray-scale method,dithers combined with minor pixel separation(MPS) are proposed after analyzing the principle of gray-scale loss in plasma display panel(PDP) and characteristics of order and random dither.In the method,first,order dither combined with MPS is used to enhance image after anti-γ correction.Then image data is mapped to limited gray-scales and relative error is computed between limited gray-scales and gray-scale needed to be displayed.Finally,image processed by limited gray-scales is enhanced by random dither combined with MPS.The experiment results show that the images processed by anti-γ correction and limited gray-scale are all greatly enhanced.The gray-scale displayed in low and mid-high gray-scale region are all smooth.There is not periodic dither noise,and intensity of minor pixel is reduced significantly.The displayed image is better than it processed only by using random or order dither.