CAJ | 학술논문

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。
침대현시계통중응용아상소채양기술인기적안색혼첩문제，해문제출일충기우현시설비아상소배포적항안색혼첩려파방법。감우안색혼첩적구역급형상여아상소배포적다양성긴밀상관，재빈역내통과도정격이론급출불동아상소배포각기색적Nyquist빈솔한제도，병이차위의거설계각기색분량상적항혼첩려파기。대도상진행려파예처리후재경아상소채양현시도상，체도보지도상청석도적동시소제혹감약현시도상중안색혼첩적목적。이론분석화방진결과표명，상대우5-tap려파법，재무명현안색착오적전제하，해방법가장도상량도분량적PSNR치제고30%좌우；령외，해산법간단，역우실현。
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.