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Image resolution enhancement using dual tree complex wavelet transform

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Fig. 1.Reference high-resolution test image and its low-resolution versions obtained by first low-pass filtering and then down-sampling by a sampling factorin both spatial dimensions: (a) Input high-resolution reference image; (b) Low-resolution version of (a) with a sampling factor 2; and (c) Low-resolutionversion of (a) with a sampling factor 4.
Fig. 2.Results of spatial resolution enhancement with a factor of 2 in both spatial dimensions: (a) Reference HR image; (b) Input LR image; (c) Resolutionenhanced image using [1]; (d) Resolution enhanced image using [2]; (e) Resolution enhanced image using [4]; (f) Resolution enhanced image using [6]; and(g) Resolution enhanced image using the proposed method.
Fig. 3.Results of spatial resolution enhancement with a factor of 4 in both spatial dimensions: (a) Reference HR image; (b) Input LR image; (c) Resolutionenhanced image using [1]; (d) Resolution enhanced image using [2]; (e) Resolution enhanced image using [4]; (f) Resolution enhanced image using [6]; and(g) Resolution enhanced image using the proposed method.

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