Luma-chroma space filter design for subpixel-based monochrome image downsampling

Lu Fang, Oscar C. Au, Ngai Man Cheung, Aggelos K. Katsaggelos, Houqiang Li, Feng Zou

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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 languageEnglish (US)
Article number6514934
Pages (from-to)3818-3829
Number of pages12
JournalIEEE Transactions on Image Processing
Issue number10
StatePublished - Sep 9 2013


  • Subpixel rendering
  • down-sampling
  • human visual system
  • improve resolution

ASJC Scopus subject areas

  • Software
  • Computer Graphics and Computer-Aided Design

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