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

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.

[1]  Jing Gu,et al.  High resolution subpixel and subframe rendering for color flatpanel and projector displays , 2011, 2011 18th IEEE International Conference on Image Processing.

[2]  J. Pokorny,et al.  Spectral sensitivity of the foveal cone photopigments between 400 and 500 nm , 1975, Vision Research.

[3]  Lu Fang,et al.  Subpixel-Based Image Down-Sampling With Min-Max Directional Error for Stripe Display , 2011, IEEE Journal of Selected Topics in Signal Processing.

[4]  Sabine Süsstrunk,et al.  Color Demosaicing by Estimating Luminance and Opponent Chromatic Signals in the Fourier Domain , 2002, CIC.

[5]  John Platt,et al.  20.4: Displaced Filtering for Patterned Displays , 2000 .

[6]  Lu Fang,et al.  Novel 2-D MMSE Subpixel-Based Image Down-Sampling , 2012, IEEE Transactions on Circuits and Systems for Video Technology.

[7]  Lu Fang,et al.  How anti-aliasing filter affects image contrast: An analysis from majorization theory perspective , 2011, 2011 IEEE International Conference on Multimedia and Expo.

[8]  Jan P. Allebach,et al.  Sequential scalar quantization of color images , 1994, J. Electronic Imaging.

[9]  Patrick J. Wolfe,et al.  Fourier Domain Display Color Filter Array Design , 2007, 2007 IEEE International Conference on Image Processing.

[10]  Rob A. Beuker,et al.  13.4: Subpixel Image Scaling for Color Matrix Displays , 2002 .

[11]  Aggelos K. Katsaggelos,et al.  Antialiasing Filter Design for Subpixel Downsampling via Frequency-Domain Analysis , 2012, IEEE Transactions on Image Processing.

[12]  Sabine Süsstrunk,et al.  Linear demosaicing inspired by the human visual system , 2005, IEEE Transactions on Image Processing.

[13]  Michiel Adriaanszoon Klompenhouwer,et al.  Subpixel image scaling for color‐matrix displays , 2003 .

[14]  J.C. Platt.  Optimal filtering for patterned displays , 2000, IEEE Signal Processing Letters.

[15]  Joseph W. Goodman,et al.  A mathematical analysis of the DCT coefficient distributions for images , 2000, IEEE Trans. Image Process..

[16]  T Troscianko,et al.  Color and luminance information in natural scenes. , 1998, Journal of the Optical Society of America. A, Optics, image science, and vision.

[17]  John Platt,et al.  20.4: Displaced Filtering for Patterned Displays , 2000 .