Vehicle-Infrastructure-Driver Interactions Research Unit. Fog detection through use of a CCD onboard camera. Nicolas HAUTIERE ITPE PhD Student. Didier AUBERT Researcher. V.I.S.I.O.N. 2004 Rouen 28 septembre 2004. Presentation Overview. Introduction. Fog, light and vision. - PowerPoint PPT Presentation
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Fog detection through use of a CCD onboard camera
Vehicle-Infrastructure-Driver Interactions Research UnitNicolas
HAUTIERE ITPE PhD StudentDidier AUBERTResearcherV.I.S.I.O.N. 2004
Rouen 28 septembre 2004
Presentation Overview Conclusion Introduction Fog, light and
vision Fog effects on road vision Modeling visual effects Algorithm
overview Results
IntroductionMeasuring the atmospheric visibility: Constitutes a
driving assistance. Estimates the operation range of onboard
perception sensors.This work is part of the french ARCOS
project.
Fog, light and vision Fog microstructureFog is a concentration
of water droplets suspended in the air, bringing visibility below
one kilometer. Light scatteringThe daylight is scattered by fog
droplets in all directions. This effect is described by an
extinction coefficient k. Visibility impairmentThe fog reduces
distant contrasts. This effect is described by the meteorological
visibility: the greatest distance at which a black object of
suitable dimensions can be seen.
Modeling fog visual effectsKoschmieders law (1924)Intrinsic
luminance of the objectFog luminance at the horizonApparent
luminance of the objectExtinction coefficient of fogDistance of the
object to the camera International Commission on Illumination
(CIE)
Computation of ROIAlgorithm overview
ResultsLow dense fog Vehicle following
ResultsDense fog Vehicle crossing
Dense fog CurveResults
ConclusionThis original method has the following advantages:
detects the presence of fog and measures the meteorological
distance of visibility, indicates if it is temporary inoperative,
is based on a physical model of fog, needs only the presence of the
road and the sky in the image to work, is real time performed,
works with a single camera.
ApplicationContrast restoration on the road surface
knownknownknown on the roadknowndeducedNEW
ApplicationNEWContrast restoration on the road surface
Applications envisagesActivation/dsactivation des feux de
anti-brouillardInformation du conducteur sur la distance de
visibilitInformation des vhicules situs en amont dune zone de
faible visibilitAdaptation automatique de la vitesse selon les
conditions mtorologiquesInformation vers les systmes de traitement
vido embarqus sur la qualit des images
