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Mobile Information Systems
Volume 2017 (2017), Article ID 2314062, 12 pages
https://doi.org/10.1155/2017/2314062
Research Article

Statistical Prior Aided Separate Compressed Image Sensing for Green Internet of Multimedia Things

Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China

Correspondence should be addressed to Jian Jiao; nc.ude.tih@naijoaij

Received 16 December 2016; Accepted 22 February 2017; Published 16 March 2017

Academic Editor: Nan Zhao

Copyright © 2017 Shaohua Wu 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

In this paper, we aim to propose an image compression and reconstruction strategy under the compressed sensing (CS) framework to enable the green computation and communication for the Internet of Multimedia Things (IoMT). The core idea is to explore the statistics of image representations in the wavelet domain to aid the reconstruction method design. Specifically, the energy distribution of natural images in the wavelet domain is well characterized by an exponential decay model and then used in the two-step separate image reconstruction method, by which the row-wise (or column-wise) intermediates and column-wise (or row-wise) final results are reconstructed sequentially. Both the intermediates and the final results are constrained to conform with the statistical prior by using a weight matrix. Two recovery strategies with different levels of complexity, namely, the direct recovery with fixed weight matrix (DR-FM) and the iterative recovery with refined weight matrix (IR-RM), are designed to obtain different quality of recovery. Extensive simulations show that both DR-FM and IR-RM can achieve much better image reconstruction quality with much faster recovery speed than traditional methods.