Traffic sensor
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United States of America Patent
Stats
-
Jul 6, 2004
Grant Date -
N/A
app pub date -
Apr 13, 1998
filing date -
Apr 14, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A traffic sensor system for detecting and tracking vehicles is describede. A video camera is employed to obtain a video image of a section of a roadway. Motion is detected through changes in luminance and edges in frames of the video image. Predetermined sets of pixels ('tiles') in the frames are designated to be in either an 'active' state or an 'inactive' state. A tile becomes active when the luminance or edge values of the pixels of the tile differ from the respective luminance or edge values of a corresponding tile in a reference frame in accordance with predetermined criteria. The tile becomes inactive when the luminance or edge values of the pixels of the tile do not differ from the corresponding reference frame tile in accordance with the is predetermined criteria. Shape and motion of groups of active tiles ('quanta') are analyzed with software and a neural network to detect and track vehicles.
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