Wireless sensor networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
A Survey on Data Compression in Wireless Sensor Networks
ITCC '05 Proceedings of the International Conference on Information Technology: Coding and Computing (ITCC'05) - Volume II - Volume 02
Cyclops: in situ image sensing and interpretation in wireless sensor networks
Proceedings of the 3rd international conference on Embedded networked sensor systems
Power aware image transmission in energy constrained wireless networks
ISCC '04 Proceedings of the Ninth International Symposium on Computers and Communications 2004 Volume 2 (ISCC"04) - Volume 02
Energy-optimized image communication on resource-constrained sensor platforms
Proceedings of the 6th international conference on Information processing in sensor networks
Demonstration of image compression in a low-bandwidth wireless camera network
Proceedings of the 6th international conference on Information processing in sensor networks
Distributed video coding: Selecting the most promising application scenarios
Image Communication
Symmetric distributed coding of stereo omnidirectional images
Image Communication
Energy-efficient image transmission in sensor networks
International Journal of Sensor Networks
Low-complexity and energy efficient image compression scheme for wireless sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Error resilient image communication with chaotic pixel interleaving for wireless camera sensors
Proceedings of the workshop on Real-world wireless sensor networks
Enumeration encoding and decoding algorithms for pyramid cubic lattice and trellis codes
IEEE Transactions on Information Theory - Part 2
IEEE Transactions on Information Theory
Lattice codebook enumeration for generalized Gaussian source
IEEE Transactions on Information Theory
Journal of Systems Architecture: the EUROMICRO Journal
Journal of Systems Architecture: the EUROMICRO Journal
Low-cost prioritization of image blocks in wireless sensor networks for border surveillance
Journal of Network and Computer Applications
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This article presents a lightweight image compression algorithm explicitly designed for resource-constrained wireless camera sensors, called TiBS (tiny block-size image coding). TiBS operates on blocks of 2x2 pixels (this makes it easy for the end-user to conceal missing blocks due to packet losses) and is based on pixel removal. Furthermore, TiBS is combined with a chaotic pixel mixing scheme to reinforce the robustness of image communication against packet losses. For validation purposes, TiBS as well as a JPEG-like algorithm have been implemented on a real wireless camera sensor composed of a Mica2 mote and a Cyclops imager. The experimental results show that TiBS does not provide high compression ratios, but it enables energy-efficient image communication, even for the source camera node, and even for high packet loss rates. Considering an original 8-bpp grayscale image for instance, the amount of energy consumed by the Cyclops/Mica2 can be reduced by around 60% when the image is compressed using TiBS, compared to the scenario without compression. Moreover, the visual quality of reconstructed images is usually acceptable under packet losses conditions up to 40-50%. In comparison, the JPEG-like algorithm results in clearly more energy consumption than TiBS at similar image quality and, of course, its resilience to packet losses is lower because of the larger size of encoded blocks. Adding redundant packets to the JPEG-encoded data packets may be considered to deal with packet losses, but the energy problem remains.