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

• Main Authors: Shaohua Wu, Tiantian Zhang, Jian Jiao, Jingran Yang, Qinyu Zhang
• Format: Article
• Language: English
• Published: Hindawi Limited 2017-01-01
• Series: Mobile Information Systems
• Online Access: http://dx.doi.org/10.1155/2017/2314062

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.