title: Luma-chroma space filter design for subpixel-based monochrome image downsampling.
abstract: In general, subpixel-based downsampling can achieve higher apparent resolution of the down-sampled images on LCD or OLED displays than pixel-based downsampling. With the frequency domain analysis of subpixel-based downsampling, we discover special characteristics of the luma-chroma color transform choice for monochrome images. With these, we model the anti-aliasing filter design for subpixel-based monochrome image downsampling as a human visual system-based optimization problem with a two-term cost function and obtain a closed-form solution. One cost term measures the luminance distortion and the other term measures the chrominance aliasing in our chosen luma-chroma space. Simulation results suggest that the proposed method can achieve sharper down-sampled gray/font images compared with conventional pixel and subpixel-based methods, without noticeable color fringing artifacts.
authors.affiliation: Department of Electronic Engineering andInformation Science, University of Science and Technology of China, Hefei, China. fanglu@ustc.edu.cn
authors.forename: Lu
authors.initials: L
authors.lastname: Fang
authors.forename: Oscar C
authors.initials: OC
authors.lastname: Au
authors.forename: Ngai-Man
authors.initials: NM
authors.lastname: Cheung
authors.forename: Aggelos K
authors.initials: AK
authors.lastname: Katsaggelos
authors.forename: Houqiang
authors.initials: H
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Zou