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Journal of Sensors
Volume 2016 (2016), Article ID 7036349, 14 pages
Research Article

Multiscale and Multitopic Sparse Representation for Multisensor Infrared Image Superresolution

1College of Electronics and Information Engineering, University of Sichuan, Chengdu, Sichuan 610064, China
2College of Electrical and Engineering Information, University of Sichuan, Chengdu, Sichuan 610064, China
3College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China

Received 17 March 2015; Revised 4 June 2015; Accepted 9 June 2015

Academic Editor: Marco Anisetti

Copyright © 2016 Xiaomin Yang 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.


Methods based on sparse coding have been successfully used in single-image superresolution (SR) reconstruction. However, the traditional sparse representation-based SR image reconstruction for infrared (IR) images usually suffers from three problems. First, IR images always lack detailed information. Second, a traditional sparse dictionary is learned from patches with a fixed size, which may not capture the exact information of the images and may ignore the fact that images naturally come at different scales in many cases. Finally, traditional sparse dictionary learning methods aim at learning a universal and overcomplete dictionary. However, many different local structural patterns exist. One dictionary is inadequate in capturing all of the different structures. We propose a novel IR image SR method to overcome these problems. First, we combine the information from multisensors to improve the resolution of the IR image. Then, we use multiscale patches to represent the image in a more efficient manner. Finally, we partition the natural images into documents and group such documents to determine the inherent topics and to learn the sparse dictionary of each topic. Extensive experiments validate that using the proposed method yields better results in terms of quantitation and visual perception than many state-of-the-art algorithms.