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Luma-Chroma Space Filter Design for Subpixel-Based Monochrome Image Downsampling

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6 Author(s)
Lu Fang ; Dept. of Electron. Eng. & Inf. Sci., Univ. of Sci. & Technol. of China, Hefei, China ; Au, O.C. ; Ngai-Man Cheung ; Katsaggelos, A.K.
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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.

Published in:

Image Processing, IEEE Transactions on  (Volume:22 ,  Issue: 10 )

Date of Publication:

Oct. 2013

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