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Introducing Forward Scattering in Adaptive Rear Lighting Systems

Introducing Forward Scattering in Adaptive Rear Lighting Systems. Romain GALLEN (CETMEF, Brest) Nicolas HAUTI È RE (IFSTTAR, Paris) Eric DUMONT (IFSTTAR, Paris) Michèle COLOMB (CETE, Lyon) 27th Session of the CIE South Africa 2011. D4-PP26.

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Introducing Forward Scattering in Adaptive Rear Lighting Systems

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  1. Introducing Forward Scattering in Adaptive Rear Lighting Systems Romain GALLEN (CETMEF, Brest)Nicolas HAUTIÈRE (IFSTTAR, Paris)Eric DUMONT (IFSTTAR, Paris)Michèle COLOMB (CETE, Lyon) 27th Session of the CIESouth Africa 2011 D4-PP26

  2. Introducing Forward Scattering in Adaptive Lighting Systems • Question addressed • How to adapt rear-lamp intensity in fog? • Naïve solution • Estimate optical range • Inverse Beer-Lambert law • Problem • Forward scattering is neglected • Over-correction of intensity results in glare  Forward scattering Beer-Lambert Radiation fog Advection fog 27th Session of the CIE, South Africa 2011

  3. 2-lamp method N-lamp method bigger droplets Estimated Vmet (m) Vmet (m) FS=3.5 FS>4 Relative error on estimated L0 3<FS<4 2<FS<3 1<FS<2 FS<1 Vmet (m) Introducing Forward Scattering in Adaptive Lighting Systems • Contribution #1 • Improved camera-based optical range assessment method • Contribution #2 • Forward scattering indexbased on the relative error on estimated intrinsic signal luminance • Tests in virtual and artificial fog 27th Session of the CIE, South Africa 2011

  4. Thank you for your attention! Ifsttar www.ifsttar.fr nicolas.hautiere@ifsttar.fr 27th Session of the CIE, South Africa 2011

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