Proposed test protocol for video imaging detection at intersection stop lines.
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2010-08-01
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Alternative Title:Project title: Guidelines for best use of video detection for stop bar presence detection
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Abstract:Test protocols for non-loop detectors have often required comparing the performance
attributes of these detectors with those of loops or other point detectors, or to manual counts.
However, that comparison is not always appropriate for a variety of reasons, and it does not
provide all of the critical information needed to make acceptance or rejection decisions. In the
case of video image vehicle detection systems (VIVDS), comparison with loops (i.e., simple
count comparisons) provides only a limited glimpse on performance since the two systems have
different perspectives on approaching vehicles. In all cases except those in which cameras are
oriented vertically downward, cameras and loops or other pavement-based detectors detect
vehicles at different points. Also, for VIVDS, factors such as the “aspect ratio” (ratio of
horizontal distance to detection zones divided by the camera height) vary significantly, and these
variables significantly impact the accuracy of camera-processor systems. The purpose of this
document is to report on the development of a proposed concept for a VIVDS test protocol.
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