Nonlocal back-projection for adaptive image enlargement

Authors:
Weisheng Dong;Lei Zhang;Guangming Shi;Xiaolin Wu
Affiliations:
School of Electronic Engineering, Xidian University, Xi'an, China and Dept. of Computing, The Hong Kong Polytechnic University, Hong Kong;Dept. of Computing, The Hong Kong Polytechnic University, Hong Kong;School of Electronic Engineering, Xidian University, Xi'an, China;Dept. of Electrical and Computer Engineering, McMaster University, Canada
Venue:
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Year:
2009

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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 downsampled 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 isotropically 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.