为了改善等离子体显示器的动态显示质量，在减轻动态假轮廓的同时提高灰度显示质量，提出了基于直方图均衡化的自适应有限灰度级子场编码方法。该方法首先对输入图像进行直方图均衡化，在灰度“均匀分布”的新直方图上，按子场的数目平均划分灰度区间，选取每个区间中间的灰度级作为预采样灰度级；然后将预采样灰度级按照直方图均衡化的反函数进行映射，得到采样灰度级和子场编码。为了达到更好的灰度显示效果，在累积式灰度编码中，依次限定单个子场编码为零，从而得到更多的显示灰度级。仿真实验结果表明，该方法能在动态假轮廓改善和灰度级表现能力之间取得平衡，在减轻动态假轮廓的同时弥补了“累积式”发光显示灰度级不足的问题，得到了较好的显示效果。

To improve the dynamic and static image quality, a new adaptive limited grays subfield coding method based on histogram equalization was proposed. In this method, a new probability density distribution was obtained by image histogram equalization. The gray scales were divided uniformity according to the number of subfield, and the grays in middle of each sub-section as the pre-sample grays were selected. The sample grays and subfield coding were obtained through the inverse transformation of histogram equalization. A subfield was set to zero for one gray coding to get the better image quality. Simulation results show that the proposed method has the advantages of simple-accumulation and combination lighting modes. It can improve the dynamic false contrast and gray scales expression simultaneously.