Wireless sensor networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
An adaptive energy-efficient MAC protocol for wireless sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
A survey on wireless multimedia sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Energy-efficient transmission of wavelet-based images in wireless sensor networks
Journal on Image and Video Processing
Transmitting streaming data in wireless multimedia sensor networks with holes
Proceedings of the 6th international conference on Mobile and ubiquitous multimedia
Energy-efficient image transmission in sensor networks
International Journal of Sensor Networks
Wireless sensor network survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Multi-priority Multi-path Selection for Video Streaming in Wireless Multimedia Sensor Networks
UIC '08 Proceedings of the 5th international conference on Ubiquitous Intelligence and Computing
Challenging issues in visual sensor networks
IEEE Wireless Communications
Adaptive decentralized re-clustering protocol for wireless sensor networks
Journal of Computer and System Sciences
Routing techniques in wireless sensor networks: a survey
IEEE Wireless Communications
An application-specific protocol architecture for wireless microsensor networks
IEEE Transactions on Wireless Communications
IEEE Transactions on Multimedia
Image coding using wavelet transform
IEEE Transactions on Image Processing
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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.