It is the cache of http://ojs.academypublisher.com/index.php/jnw/article/view/2319. It is a snapshot of the page. The current page could have changed in the meantime.
Tip: To quickly find your search term on this page, press Ctrl+F or ⌘-F (Mac) and use the find bar.

Error Resilient Video Transmission over Wireless Networks Based on Wyner-Ziv Coding of Motion Regions | Sheng | Journal of Networks
Journal of Networks, Vol 4, No 9 (2009), 905-912, Nov 2009
doi:10.4304/jnw.4.9.905-912

Error Resilient Video Transmission over Wireless Networks Based on Wyner-Ziv Coding of Motion Regions

Tao Sheng, Jingli Zhou, Zhengbing Hu

Abstract


The multipath fading and shading of the wireless networks usually lead to the loss or error of video packets which results in significant video quality degradation. Existing approaches with forward error correction (FEC) or error concealment are unable to provide the desired robustness in video transmission. In this work, we develop a novel motion-based Wyner-Ziv coding (MWZC) scheme by leveraging distributed source coding (DSC) ideas for error robustness. The MWZC scheme is based on the fact that motion regions of a given video frame are particularly important to both objective and perceptual video quality and hence should be given preferential Wyner-Ziv coding based embedded protection. To achieve high coding efficiency, we determine the underlining motion regions based on a rate-distortion model. Within the framework of H.264/AVC specification, motion region determination can be efficiently implemented using Flexible Macroblock Ordering (FMO) and Data Partitioning (DP). The bit stream consists of two parts: the systematic portion generated from conventional H.264/AVC bit stream and the supplementary bit stream generated by the proposed feedback free rate allocation algorithm for Wyner-Ziv coding of motion regions. Experimental results demonstrate that the proposed scheme significantly outperforms both decoder-based error concealment (DBEC) and conventional FEC with DBEC approaches.



Keywords


error resilience, Wyner-Ziv coding, video transmission, motion regions

References



Full Text: PDF


Journal of Networks (JNW, ISSN 1796-2056)

Copyright @ 2006-2014 by ACADEMY PUBLISHER – All rights reserved.