Abstract:
Overtaking on rural roads may cause severe accidents when
oncoming traffic is detected by a driver too late, or its speed is
underestimated. Recently proposed cooperative overtaking assistance systems are
based on real-time video transmission, where a video stream captured with a
camera installed at the windshield of a vehicle is compressed, broadcast
through the wireless channel, and displayed to the drivers of vehicles driving
behind. In such a system, it is of ultimate importance to deliver video information
about the opposite lane with low end-to-end latency and good visual quality. In
this paper, we propose reallocating the wireless channel resources in favor of
the part of the captured video frame containing the image of the oncoming
vehicle. To achieve this goal, we apply automotive radar for oncoming vehicle
detection, and we use the image of this vehicle as a region-of-interest (ROI)
for the video rate control. We present the theoretical framework, which
describes the basics of such an approach and can serve as a useful guideline
for the future practical implementation of the overtaking assistance systems.
The benefits of our proposal are demonstrated in relation to the practical
scenario of H.264/Advance Video Coding (AVC), IEEE 802.11p/Wireless Access for
Vehicular Environments (WAVE) intervehicle communication standards, and
currently used automotive radars.
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