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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/111858

    Title: Super-Resolution Based on Clustered Examples
    Authors: Ching Ting Tu;Hsiau Wen Lin;Hwei-Jen Lin;Yue Shen Li
    Keywords: Super-resolution;locally linear embedding (LLE);K-means++++ clustering;interpolation;learning-based method;example-based method;degradation
    Date: 2016-03-18
    Issue Date: 2017-10-27 02:10:39 (UTC+8)
    Publisher: World Scientific Publishing
    Abstract: In this paper, we propose an improved version of the neighbor embedding super-resolution (SR) algorithm proposed by Chang et al. [Super-resolution through neighbor embedding, in Proc. 2004 IEEE Computer Society Conf. Computer Vision and Pattern Recognition(CVPR), Vol. 1 (2004), pp. 275–282]. The neighbor embedding SR algorithm requires intensive computational time when finding the K nearest neighbors for the input patch in a huge set of training samples. We tackle this problem by clustering the training sample into a number of clusters, with which we first find for the input patch the nearest cluster center, and then find the K nearest neighbors in the corresponding cluster. In contrast to Chang’s method, which uses Euclidean distance to find the K nearest neighbors of a low-resolution patch, we define a similarity function and use that to find the K most similar neighbors of a low-resolution patch. We then use local linear embedding (LLE) [S. T. Roweis and L. K. Saul, Nonlinear dimensionality reduction by locally linear embedding, Science 290(5500) (2000) 2323–2326] to find optimal coefficients, with which the linear combination of the K most similar neighbors best approaches the input patch. These coefficients are then used to form a linear combination of the K high-frequency patches corresponding to the K respective low-resolution patches (or the K most similar neighbors). The resulting high-frequency patch is then added to the enlarged (or up-sampled) version of the input patch. Experimental results show that the proposed clustering scheme efficiently reduces computational time without significantly affecting the performance.
    Relation: International Journal of Pattern Recognition and Artificial Intelligence 30(6), p.1655015 (15 pages)
    DOI: 10.1142/S0218001416550156
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Journal Article

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