Rate-distortion based sparse coding for image set compression

X Zhang, W Lin, S Ma, S Wang… - … and Image Processing …, 2015 - ieeexplore.ieee.org
2015 Visual Communications and Image Processing (VCIP), 2015ieeexplore.ieee.org
In this paper, we propose a novel image set compression approach based on sparse coding
with an ordered dictionary learned from perceptually informative signals. For a group of
similar images, one representative image is first selected and transformed into wavelet
domain, and then its AC components are utilized as samples to train an over-complete
dictionary. In order to improve compression efficiency, the dictionary atoms are reordered
according to their frequency used in sparse approximation of the representative image. In …
In this paper, we propose a novel image set compression approach based on sparse coding with an ordered dictionary learned from perceptually informative signals. For a group of similar images, one representative image is first selected and transformed into wavelet domain, and then its AC components are utilized as samples to train an over-complete dictionary. In order to improve compression efficiency, the dictionary atoms are reordered according to their frequency used in sparse approximation of the representative image. In addition, a rate-distortion based sparse coding method is proposed to distribute atoms among different image patches adaptively. Experimental results show that the proposed method outperforms JPEG and JPEG2000 up to 6+ dB and 2+ dB, respectively.
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