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.
Original language | English (US) |
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Article number | 6514934 |
Pages (from-to) | 3818-3829 |
Number of pages | 12 |
Journal | IEEE Transactions on Image Processing |
Volume | 22 |
Issue number | 10 |
DOIs | |
State | Published - 2013 |
Keywords
- Subpixel rendering
- down-sampling
- human visual system
- improve resolution
ASJC Scopus subject areas
- Software
- Computer Graphics and Computer-Aided Design