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Advances in Multimedia
Volume 2015 (2015), Article ID 285969, 10 pages
http://dx.doi.org/10.1155/2015/285969
Research Article

Video Superresolution Reconstruction Using Iterative Back Projection with Critical-Point Filters Based Image Matching

Department of Communication Engineering, Xiamen University, Xiamen, Fujian 361005, China

Received 27 December 2014; Accepted 23 February 2015

Academic Editor: Constantine Kotropoulos

Copyright © 2015 Yixiong Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To improve the spatial resolution of reconstructed images/videos, this paper proposes a Superresolution (SR) reconstruction algorithm based on iterative back projection. In the proposed algorithm, image matching using critical-point filters (CPF) is employed to improve the accuracy of image registration. First, a sliding window is used to segment the video sequence. CPF based image matching is then performed between frames in the window to obtain pixel-level motion fields. Finally, high-resolution (HR) frames are reconstructed based on the motion fields using iterative back projection (IBP) algorithm. The CPF based registration algorithm can adapt to various types of motions in real video scenes. Experimental results demonstrate that, compared to optical flow based image matching with IBP algorithm, subjective quality improvement and an average PSNR score of 0.53 dB improvement are obtained by the proposed algorithm, when applied to video sequence.