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- W1978692783 abstract "Low-resolution (LR) document images may cause difficulties in reading or low recognition rates in computer vision. Thus, it is necessary to improve the resolution of an LR document image via some algorithms. In this study, a novel document image super-resolution (SR) method using structural similarity and Markov random field (MRF) is proposed. First, the non-local algorithm is utilised to find similar patches. Instead of using the Euclidian distance, a modified chi-square distance is proposed to measure the patch similarity because the bimodality characteristic of the document images can be better described by this modified chi-square distance. Finally, the structural similarity of similar patches is served as a constraint for the MRF-based SR method, which is proper to describe the neighbouring relationship between patches. The SR reconstruction for LR images of printed and handwritten documents are carried out by the proposed algorithm. Experimental results show that the reconstructed SR images obtain higher peak signal-to-noise ratio and structural similarity values than those of several state-of-the-art SR methods and visually pleasant SR images can be produced as well." @default.
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- W1978692783 date "2014-12-01" @default.
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- W1978692783 title "Document image super‐resolution using structural similarity and Markov random field" @default.
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- W1978692783 doi "https://doi.org/10.1049/iet-ipr.2013.0412" @default.
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