INITIAL INVESTIGATION OF BANDWIDTH REQUIRED FOR COLLISION AVOIDANCE USING A VIDEO CAMERA ON A REMOTELY CONTROLLED VEHICLE

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Authors
  1. Racca, R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Jasco Research Ltd, Brentwood Bay BC (CAN)
Abstract
To hunt for mines remotely, an unamnned vehicle must obtain sonar images along a series of tracks. The system being developed in Canada includes a semi-submersible with an above-water mast, towing a towfish with a multibeam side-scan sonar. Although the track-following will be automated, it is essential to avoid vessels (during training) and other obstacles, and this requires a video camera mounted on the mast. However, transmitting the full video signal to the mother craft would require a complex microwave system. The aim of this brief study was to assess the use of image compression formats and reduced framing rates to reduce the bandwidth requirement by at least an order of magnitude, to a rate not much larger than the sonar signal. If this could be done, the two signals could likely be transmitted over a relatively simple radio link. The task was organized in two parts: a cursory literature search aimed at identifying the current status of video compression algorithms and hardware and assessing the merits of various approaches, and a practical phase in which a few representative sequences from a test video tape of forward-looking marine imagery were digitized and subjected to various compression schemes in order to compare both the reduction in data size and the subjective quality of the reconstructed images. TRUNCATED
Keywords
Towfish;Dolphin;remote control vehicle;Video compression;Video bandwidth;MPEG
Report Number
DREA-CR-96-463 — Contractor Report
Date of publication
01 Nov 1996
Number of Pages
48
DSTKIM No
98-00402
CANDIS No
507001
Format(s):
Hardcopy;Document Image stored on Optical Disk

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