Delay-aware DWT-based image transmission in wireless visual sensor networks

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Costa, DG (Author) FEUP; Guedes, LA (Author) Other; Francisco Vasques (Author) FEUP; Paulo Portugal (Author) FEUP

Conference proceedings International

Title: WebMedia 2013 - Proceedings of the 19th Brazilian Symposium on Multimedia and the Web

Pages: 157-164

19th Brazilian Symposium on Multimedia and the Web, WebMedia 2013

Salvador, 5 November 2013 through 8 November 2013

Indexing

Scopus - 2 Citations

Other information

Authenticus ID: P-008-P7W

DOI: 10.1145/2526188.2526200

Abstract (EN): Wireless sensor networks have been employed as an effective tool for a large set of monitoring applications, directly supporting applications not addressed by conventional Internet-based technologies. Camera-enabled sensors enhance the applicability of those networks allowing innovative visual monitoring functions. Sometimes, source nodes will perform real-time monitoring of an area of interest, where visual data packets will need to be transmitted with minimum delay. However, energy depletion of the nodes that compose the transmission paths may hamper the network capability to deliver packets with time constraints. In such context, we propose a delay-aware image transmission mechanism where the relevancies of DWT subbands are considered when forwarding packets to the next hop toward the sink. In fact, parts of DWT-based encoded visual data may have different relevancies for the reconstruction of the original visual information and those relevancies may be exploited when forwarding packets. In the proposed approach, high-relevant packets are forwarded through paths with lower average end-to-end delay, while the remaining packets flow through paths high higher delay, allowing that low-quality versions of the transmitted images reach the sink as soon as possible. Moreover, the best paths will need to relay fewer packets, potentially reducing energy consumption and enlarging their lifetime. We present simulation results to attest the benefits of the proposed mechanism. © 2013 ACM.

Language: English

Type (Professor's evaluation): Scientific