Sparse representation based down-sampling image compression |
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| Authors: | Jin WangYunhui Shi Dehui KongWenpeng Ding Chunjing Li Baocai Yin |
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| Institution: | a Beijing Key Laboratory of Multimedia and Intelligent Software Technology, College of Computer Science and Technology, Beijing University of Technology, Beijing 100124, Chinab Department of Mathematics, Tongji University, Shanghai 200092, China |
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| Abstract: | In this paper, we give an analytical model of the compression error of down-sampled compression based on wavelet transform, which explains why down-sampling before compression can improve coding performance. And we approximate the missing details due to down-sampling and compression by using the linear combination of a set of basis vectors with L1 norm. Then we propose a down-sampled and high frequency information approximated coding scheme and apply it to natural images, and achieve gains of both subjective quality and objective quality compared with JPEG2000. |
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| Keywords: | Wavelet Error analysis Sparse representation Optimization |
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