No abstract

Abstract. An Autonomous Fire Detector (AFD) is a miniature electronic package 14 combining position location capability (using the Global Positioning System [GPS]), 15 communications (packet or voice-synthesized radio), and fire detection capability

Video streaming from sensors and miniaturized devices is attractive for a wide range of web-based applications, e.g., remote surveillance. Existing web-based video streaming frameworks, such as the hypertext transfer protocol (HTTP) live streaming (HLS) and the motion picture experts group's dynamic adaptive streaming over HTTP (MPEG-DASH), have dependencies between the individual video segments and a manifest file that contains video metadata. Also, existing web-based video players are limited to fetching video segments over TCP/IP networks. The video segment dependencies complicate video segment distribution by resource-constrained source nodes, which may employ non-TCP/IP protocols, such as Zigbee. This paper proposes and evaluates a wireless video sensor network platform compatible DASH (WVSNP-DASH) framework and a WVSNP-DASH player (WDP) for flexible web-based access of video from sensors and other miniaturized source nodes. The WVSNP-DASH framework is based on independently playable video segments with a specific naming syntax that conveys elementary metadata so as to facilitate flexible search, transfer, distribution, and playback. The WDP employs elementary processes of version 5 of the hypertext markup language (HTML5) for video buffering and playback. Video segments are fetched into the HTML5 file system space, permitting flexible video fetching over a wide range of protocols, including sensor network protocols. Comparative evaluations of a WDP prototype with optimized HLS and MPEG-DASH players indicate that WDP has low client (receiver) load, while providing significant potential for power savings on the source node serving the video streams.Index Terms-Dynamic adaptive HTTP streaming (DASH), HTTP live streaming (HLS), HTML5 file system (FS), video distribution, video streaming, wireless video sensor.

An Autonomous Environmental Sensor (AES) is a miniature electronic package combining position location capability (using the Global Positioning System (GPS)), communications (packet or voice-synthesized radio), and environmental detection capability (thermal, gas, radiation, optical emissions) into a small, inexpensive, deployable package. AESs can now be made with commercial off-the-shelf components. The AES package can be deployed at a study site by airdrop or by workers on the ground, and operates as a data logger (recording data locally) or as a sentry (transmitting data real-time). Using current low-power electronics technology, an AES can operate for a number of weeks using a simple dry battery pack, and can be designed to have a transmitting range of several kilometers with current low power radio communication technology. A receiver to capture the data stream from the AES can be made as light, inexpensive and portable as the AES itself. In addition, inexpensive portable repeaters can be used to extend the range of the AES and to coordinate many probes into an autonomous network. We will discuss the design goals and engineering restrictions of an AES, and show a design in a particular application as a wildland fire sentry.

No abstract