Wireless Visual Sensor Network (WVSN) is an emerging field which combines image sensor, on board computation unit, communication component and energy source. Compared to the traditional wireless sensor network, which operates on one dimensional data, such as temperature, pressure values etc., WVSN operates on two dimensional data (images) which requires higher processing power and communication...

We propose and evaluate RIDA, a novel robust information-driven data compression architecture for distributed wireless sensor networks, allowing it to conserve energy and bandwidth. The key idea is to determine the data correlation among a group of sensors based on the values of the data itself to significantly improve compression performance. Hence, this approach moves beyond traditional data ...

Multimedia Web services constitute a considerable load on Internet bandwidth and on Web servers. With the increasing demand of multimedia Web services, the need to maintain a respectable QoS is a major concern for multimedia Web services’ providers. Binary data compression, lossy and lossless, increases performance gain and maintains QoS, at large and small-scale implementations. At the expense...

Due to bandwidth constraints on the wireless link in an IP network, it is useful to compress the headers so as to maximize the utilization of the link. Different Header Compression schemes have been proposed. Some make use of the similarity in consecutive headers in a packet flow to compress these headers. These are called here time compression, as they acquire the compression information over ...

Iris recognition for human identification is one of the most accurate biometrics, and its employment is expanding globally. The use of portable iris systems, particularly in law enforcement applications, is growing. In many of these applications, the portable device may be required to transmit an iris image or template over a narrow-bandwidth communication channel. Typically, a full resolution ...

Efficient web browsing on mobile computers presents a unique challenge. These machines are different from other classes of client computers since they have relatively lowbandwidth connections and they are battery-powered and therefore limited by their energy consumption. However, they tend to interact with the same servers for the delivery of web content. This project investigates optimizing th...

The transmission of still images over wireless channels is an exercise in tradeoos. For bandwidth eeciency, a high source compression rate is required. However, the transmission must be robust towards channel errors since wireless channels are subject to fading. These are connicting requirements. High source compression rates result in images that are very vulnerable to any single bit error. Lo...

This paper presents FPGA-based implementation and performance analysis of the hardware for lossless compression of a floating-point data stream. The implementation includes the variable-to-fixed length converter (VFCONV) and the fixed-to-variable length converter (FVCONV) that have not been designed and evaluated so far. The prototype system on ALTERA Stratix IV FPGA demonstrates that the compr...

Present mobile computing does not support the simultaneous use of multiple heterogeneous network interfaces for a single transport layer connection. In this paper, we describe a solution for channel aggregation at the transport layer, which provides increased bandwidth to mobile nodes. We present R-MTP (Reliable Multiplexing Transport Protocol), a rate-based reliable transport protocol capable ...

Most earth observation satellites in their daily image processing routine operate using the “store and forward” mechanism; this mode of operation is not efficient due to the huge amount of data that has to be stored on-board the satellite (but cannot due to memory constraints). The Cape Peninsula University of Technology (CPUT) 3U CubeSat named ZACUBE-02 will perform the filtering and compressi...