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Sensors 2014, 14(2), 3652-3674;

Sparse Representations-Based Super-Resolution of Key-Frames Extracted from Frames-Sequences Generated by a Visual Sensor Network

College of Electronics and Information Engineering, Sejong University, Seoul 143-747, Korea
Author to whom correspondence should be addressed.
Received: 8 January 2014 / Revised: 4 February 2014 / Accepted: 5 February 2014 / Published: 21 February 2014
(This article belongs to the Section Sensor Networks)
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Visual sensor networks (VSNs) usually generate a low-resolution (LR) frame-sequence due to energy and processing constraints. These LR-frames are not very appropriate for use in certain surveillance applications. It is very important to enhance the resolution of the captured LR-frames using resolution enhancement schemes. In this paper, an effective framework for a super-resolution (SR) scheme is proposed that enhances the resolution of LR key-frames extracted from frame-sequences captured by visual-sensors. In a VSN, a visual processing hub (VPH) collects a huge amount of visual data from camera sensors. In the proposed framework, at the VPH, key-frames are extracted using our recent key-frame extraction technique and are streamed to the base station (BS) after compression. A novel effective SR scheme is applied at BS to produce a high-resolution (HR) output from the received key-frames. The proposed SR scheme uses optimized orthogonal matching pursuit (OOMP) for sparse-representation recovery in SR. OOMP does better in terms of detecting true sparsity than orthogonal matching pursuit (OMP). This property of the OOMP helps produce a HR image which is closer to the original image. The K-SVD dictionary learning procedure is incorporated for dictionary learning. Batch-OMP improves the dictionary learning process by removing the limitation in handling a large set of observed signals. Experimental results validate the effectiveness of the proposed scheme and show its superiority over other state-of-the-art schemes. View Full-Text
Keywords: visual sensor; super-resolution; redundant dictionary; matching pursuit visual sensor; super-resolution; redundant dictionary; matching pursuit
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Sajjad, M.; Mehmood, I.; Baik, S.W. Sparse Representations-Based Super-Resolution of Key-Frames Extracted from Frames-Sequences Generated by a Visual Sensor Network. Sensors 2014, 14, 3652-3674.

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