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Advances in Multimedia
Volume 2007 (2007), Article ID 25187, 9 pages
http://dx.doi.org/10.1155/2007/25187
Research Article

Energy-Constrained Quality Optimization for Secure Image Transmission in Wireless Sensor Networks

1Faculty of Computer and Electronics Engineering, University of Nebraska-Lincoln, Omaha, NE 68182, USA
2Institute of Communication Engineering, National Sun Yat-Sen University, 70 Lien-hai Rd., Kaohsiung 804, Taiwan

Received 1 May 2007; Accepted 22 August 2007

Academic Editor: Tasos Dagiuklas

Copyright © 2007 Wei Wang 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

Resource allocation for multimedia selective encryption and energy efficient transmission has not been fully investigated in literature for wireless sensor networks (WSNs). In this article, we propose a new cross-layer approach to optimize selectively encrypted image transmission quality in WSNs with strict energy constraint. A new selective image encryption approach favorable for unequal error protection (UEP) is proposed, which reduces encryption overhead considerably by controlling the structure of image bitstreams. Also, a novel cross-layer UEP scheme based on cipher-plain-text diversity is studied. In this UEP scheme, resources are unequally and optimally allocated in the encrypted bitstream structure, including data position information and magnitude value information. Simulation studies demonstrate that the proposed approach can simultaneously achieve improved image quality and assured energy efficiency with secure transmissions over WSNs.