Nonlocal back-projection for adaptive image enlargement

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Authors Weisheng Dong, Lei Zhang, Guangming Shi, and Xiaolin Wu
Journal/Conference Name 2009 International Conference on Image Processing (ICIP 2009)
Paper Category
Paper Abstract This paper presents a novel non-local iterative back-projection (NLIBP) algorithm for image enlargement. The iterative back-projection (IBP) technique iteratively reconstructs a high resolution (HR) image from its blurred and down sampled low resolution (LR) counterpart. However, the conventional IBP methods often produce many “jaggy” and “ringing” artifacts because the reconstruction errors are back projected into the reconstructed image isotopically and locally. In natural images, usually there exist many non-local redundancies which can be exploited to improve the image reconstruction quality. Therefore, we propose to incorporate adaptively the non-local information into the IBP process so that the reconstruction errors can be reduced. Experimental results demonstrated that the proposed NLBP can reconstruct faithfully the HR images with sharp edges and texture structures. It outperforms the state-of-the-art methods in both PSNR and visual perception.
Date of publication 2009
Code Programming Language Visual C++

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