Abstract
Recently, some sparse representation based image reconstruction methods have demonstrated with a learnt dictionary. In this paper, we propose a block-based image sparse representation approach with an online directional dictionary (ODD). Unlike the conventional dictionary learning approaches for image sparse representation aims at learning some signal patterns from a large set of training image patches, the proposed joint dictionary for each patch is composed by an original offline or online trained sub-dictionary from a training set and an novel adaptive directional sub-dictionary estimated from the reconstructed nearby pixels of the patch itself. A joint dictionary with ODD has two main advantages compared with the conventional dictionaries. First, for each patch to be sparse represented, not only the most general contents, but also the most possible directional textures of the image patch are considered to improve the reconstruction performance. Second, in order to save storage costs, only the original trained sub-dictionary should be stored, the proposed ODD can be obtained consistently. Experimental results show that the reconstruction performance of the proposed approach exceeds other competitive dictionary learning based image sparse representation methods, validating the superiority of our approach.
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Acknowledgement
This work was supported in part by the National Science Foundation of China (NSFC) under grants 61472101 and 61631017, the National High Technology Research and Development Program of China (863 Program 2015AA015903), and the Major State Basic Research Development Program of China (973 Program 2015CB351804).
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Xu, D., Gao, X., Fan, X., Zhao, D., Gao, W. (2018). ODD: An Algorithm of Online Directional Dictionary Learning for Sparse Representation. In: Zeng, B., Huang, Q., El Saddik, A., Li, H., Jiang, S., Fan, X. (eds) Advances in Multimedia Information Processing – PCM 2017. PCM 2017. Lecture Notes in Computer Science(), vol 10736. Springer, Cham. https://doi.org/10.1007/978-3-319-77383-4_92
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DOI: https://doi.org/10.1007/978-3-319-77383-4_92
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