彩色矩阵显示器亚像素采样混色错误的分析与评价

Analysis and evaluation of color aliasing for subpixel sampling in color matrix display

从彩色矩阵显示的亚像素排布(SPA)出发,详细分析了亚像素采样(SPS)颜色错误出现的原因及条件,指出了颜色错误与SPA的关系,得出对任意一种SPA颜色错误只发生在与排布错误方向平行且图像输入频率大于Nyquist频率的区域。根据人眼视觉特性,提出了区域混合的颜色误差评测方法。此方法以原图像颜色为基准,最小化结构基元覆盖区域下的颜色误差,对图像累计该误差并以累计结果的各种统计指标作为显示图像与原始图像颜色偏差的一种度量。计算结果与仿真实验的分析结果相符,能够正确反应出SPS对混色问题的影响。

The reasons and conditions resulting in color aliasing of display images by subpixel sampling technology are analyzed in detail from the subpixel arrangement（SPA） of color matrix displays.This paper points out the relationship between color aliasing and SPA,and concludes that the color aliasing,to any kind of SPA,just occurs at the regions of images which have parallel error directions of SPA and with the frequencies above the Nyquist one.According to human vision system,a novel estimating method to color aliasing based on color blending of regions is proposed.This method minimizes bending color errors in the regions covered by structure basis element based on the original image color,accumulates the errors,and takes some statistics of the accumulation results as the measure of color deviation between the original image and the display image.And the calculations which can reflect the effects of subpixel sampling on color blending problems agree with the results of simulation experiments.