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—A characteristic of urban sensing is that applications need to compose the operations and fuse information from sensing fabrics extant in the environment, to meet requirements for which the fabrics were not designed a priori. We propose an architecture, WEAVE, that allows tailoring of applications across one or more urban sensing fabrics. Key to the(More)
—Typically, for energy efficiency and scalability purposes , sensor networks have been used in the context of environmental and traffic monitoring applications in which operations at the sensor level are not computationally intensive. But increasingly, sensor network applications require data and compute intensive sensors such video cameras and microphones.(More)
Disclaimer: The views expressed are those of the author(s) and do not reflect the official policy or A shockingly large body of failures suggests that Mobile Ad Hoc Networks (MANETs) simply do not scale beyond about 100 nodes. The key difficulty is that the complexity of the network dynamics becomes overwhelming as the scale of the network grows. It has(More)
We present a portable wireless multi-camera network based system that quickly recognizes face of human subjects. The system uses low-power embedded cameras to acquire video frames of subjects in an uncontrolled environment and opportunistically extracts frontal face images in real time. The extracted images may have heavy motion blur, small resolution and(More)
The limited power budgets of sensor networks necessitate in-network pre-processing to reduce communication overhead. The low power consumption of analog signal processing (ASP) is well-suited for this task. However, adoption of ASP is restrained by the longer design time relative to reconfigurable/reprogrammable digital processing. Our solution is to enable(More)
Real-time information about the state (location, speed, direction) of other vehicles in the system is critical for both safety and navigation applications in future intelligent transportation systems. However, reliably obtaining this information over multiple hops in a wireless network while avoiding network congestion in the shared channel poses a(More)
Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We present a distributed algorithm for creation of geometric spanners in a wireless sensor network. Given any connected network, we show that the algorithm terminates in í µí±‚(1) time, irrespective of network(More)
As Wireless Sensor Networks have emerged as an exciting new area of research, testbeds have become the preferred basis for experimentation. In such testbeds, getting correct experimental result is essential. To address this need, we have developed a testbed termed as SRMSenseNet which consists of sensor nodes connected to a testbed server facilitating(More)
This thesis describes the design, implementation and performance analysis of a transcoder for MPEG– 2 streams. When streaming MPEG video over a heterogeneous network such as Internet, the available bandwidth is not the same at different points of the broadcast chain. Video transcoding is one of the key technologies required to dynamically adapt the bit-rate(More)
We present an integrated analog signal processor for resource-constrained sensing applications, such as wireless sensor networks, wherein sensors are remotely deployed in inaccessible locations. The processor, which is reconfigurable and operates at 27.8μW, extends the capabilities of sensor nodes by performing spectral analysis and event detection in(More)