Optimized Median Lifting Scheme for Lossy Image Compression

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概要

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• In JPEG2000, the Cohen-Daubechies-Feauveau (CDF) 9/7-tap wavelet filter was implemented by using the conventional lifting scheme. However, the filter coefficients remain complex, and the conventional lifting scheme disregards image edges in the coding process. In order to solve these issues, we propose a lifting scheme in two steps. In the first step, we select the appropriate filter coefficients; in the second step, we employ a median operator to regard image edges. Experimental results show that the peak signal-to-noise ratio (PSNR) value of the proposed lifting scheme is significantly improved, by up to 0.75dB on average, compared to that of the conventional lifting scheme in the CDF 9/7-tap wavelet filter of JPEG2000.

• 2011-03-01

著者

• QUAN Do

  Gwangju Institute of Science and Technology (GIST)

• HO Yo-Sung

  Gwangju Institute of Science and Technology (GIST)

• Quan Do

  Gwangju Inst. Sci. And Technol. (gist) Gwangju Kor

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• Optimized Median Lifting Scheme for Lossy Image Compression

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