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An Iterative Back-Projection Technique for Single Image Super Resolution with Natural Texture Preservation

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Emerging Trends in Electrical, Electronic and Communications Engineering (ELECOM 2016)

Part of the book series: Lecture Notes in Electrical Engineering ((LNEE,volume 416))

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Abstract

High resolution images obtained from single image super resolution often suffer from excessive smoothness which blurs edges and gives smooth areas an un-natural texture. This paper proposes a super resolution method that combines wavelet super resolution and an edge enhancing back-projection filter to produce a super resolution image with sharp edges and natural texture. The low resolution image is first up-sampled using the discrete wavelet transform. High frequency sub-bands are derived from DWT of a bicubic interpolated low resolution image. The up-sampled image is then subjected to iterative back projection using a back-projection filter based on the Laplacian of Gaussian. The proposed method is tested on RGB colour images. It is found to produce better results than bicubic interpolation and selected edge directed interpolation methods in terms of PSNR and SSIM. It is also found to approximate the edge sharpness of edge directed interpolation while giving a more natural texture in smooth areas. The proposed method also eliminates spurious colours that have been observed in most edge-directed methods.

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Correspondence to Boniface M. Ngocho .

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Ngocho, B.M., Mwangi, E. (2017). An Iterative Back-Projection Technique for Single Image Super Resolution with Natural Texture Preservation. In: Fleming, P., Vyas, N., Sanei, S., Deb, K. (eds) Emerging Trends in Electrical, Electronic and Communications Engineering. ELECOM 2016. Lecture Notes in Electrical Engineering, vol 416. Springer, Cham. https://doi.org/10.1007/978-3-319-52171-8_18

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  • DOI: https://doi.org/10.1007/978-3-319-52171-8_18

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