一种与显示设备相关的抗颜色混叠新方法

摘要

针对显示系统中应用亚像素采样技术引起的颜色混叠问题，该文提出一种基于显示设备亚像素排布的抗颜色混叠滤波方法。鉴于颜色混叠的区域及形状与亚像素排布的多样性紧密相关，在频域内通过倒晶格理论给出不同亚像素排布各基色的Nyquist频率限制图，并以此为依据设计各基色分量上的抗混叠滤波器。对图像进行滤波预处理后再经亚像素采样显示图像，达到保持图像清晰度的同时消除或减弱显示图像中颜色混叠的目的。理论分析和仿真结果表明，相对于5-tap滤波法，在无明显颜色错误的前提下，该方法可将图像亮度分量的PSNR值提高30%左右；另外，该算法简单，易于实现。%Considering the color aliasing caused by down-sampling in display systems, a novel color anti-aliasing filtering method based on the subpixel arrangements of displays is proposed. Due to the shape and the area of color aliasing are closely related with the diversity of arrangements, the Nyquist limits of different primary colors within various arrangements are obtained in frequency domain by reciprocal lattice theory, and the anti-aliasing filters applied to different primary colors are designed. To suppress color aliasing efficiently while keeping more original image details, the images are reconstructed and displayed through subpixel sampling after preprocessed by them. Analysis and experiments show that when the clarity of display images is measured by the PSNR at the luminance component, the method proposed in this paper can increase the PSNR nearly 30%than 5-tap filtering. At the same time, the method is simple and easy to implement.