Protocols for Video Conferencing and Surveillance You Are Here Brian Schott Ladan Gharai Colin Perkins Carl Worth NETEX Industry Day September, 2001

SITEX00: Twentynine Palms, August 2000 DARPA SensIT exercise. Prototype user platform was laptop, HUD, GPS, compass. –Own location/bearing in sensor network on topographical display. –Eventual target is PDA. GUI communicated with Sensoria 1.0 nodes in field using instrumentation Ethernet backbone (wired). –Tracked GPS location variation from survey. –Exercised Sensorware- created maximal breach path algorithm as sensor nodes were moved. You Are Here?

SITEX01: Twenty-nine Palms, March 2001 In Sensor Field: –Wave Intensity Comparison – multiple projections are made from seismic signal energy at sensor node clusters. –Nine Rockwell HYDRA nodes. –Laptop with web cam. –COTS wireless Ethernet bridge to base camp (~1km). At Base Camp: –Situation status display GUI (running on laptop). –Live video feed on wireless PDA. (ISI, VT, UCLA, Rockwell)

Hardware Baseline Rockwell WINS is a modular stack consisting of: Power Board StrongARM Board Radio Board Sensor Board Fairly representative of other sensor nodes in the community. We plan to adapt this node to allow module-level power instrumentation and logging both in the lab and in the field. Note: The processor has idle and sleep modes, but they are currently not implemented. Robert Parker USC INFORMATION SCIENCES INSTITUTE

The Digital Amphitheatre - Scaling Multimedia Conferencing For more information visit: This work is supported by the DARPA under the Next Generation Internet program. After capturing an image of the background, the subject enters the picture. The difference between the original background and the current image is calculated, and used as a mask. Pixels in the image are replaced by those of a replacement background, based on the mask. The algorithm runs in real-time on a standard workstation. The Digital Amphitheatre is a collaborative environment for large scale multimedia conferences and meetings. The innovative use of standard protocols, combined with distributed computation and digital signal processing, results in a conferencing environment which scales to hundreds of participants.. Next Generation Internet STA Background SubstitutionSpatial Tiling Each user sends video to a spatial tiling agent (STA). The STA then “tiles” groups of up to 15 video streams into an single video stream. This results in fewer packets and therefore less packet overhead and processing time. Graph (a) displays the reduction in packets per second (pps) for the H.261 video streams in the highlighted block, graph (b) shows that the bit rate/quality is unchanged. (a) (b) Data rate (kbps) Time(seconds) 'tiled-h261-bps' 'separate-h261-bps' Packets per Second Time(seconds) 'tiled-h261-pps' 'separate-h261-pps'