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Shape from Shading under diffuse lighting: does dark mean deep?

Michael Langer Heinrich Bülthoff NEC Research Institute MPI for Biological Cybernetics Princeton, NJ Tübingen, Germany.

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Shape from Shading under diffuse lighting: does dark mean deep?

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  1. Michael Langer Heinrich Bülthoff NEC Research Institute MPI for Biological Cybernetics Princeton, NJ Tübingen, Germany Shape from Shading under diffuse lighting: does dark mean deep? Presentation at the European Conference on Visual Perception, Oxford, U.K, August 1998

  2. SFS on a Sunny Day  L  N(x)   I(x) = N(x) L

  3. SFS on a Sunny Day   I(x) = N(x) L

  4. SFS on a Cloudy Day  (x)

  5. SFS under Diffuse Lighting      I(x) N(x) L dL  (x)  (x) = angle of visible light source

  6. SFS under Diffuse Lighting

  7. Hill or Valley ?

  8. SFS under Diffuse Lighting Does Dark Means Deep?

  9. Does Dark Means Deep? local intensity maximum

  10. intensity anti-correlated correlated _ + depth _ + Height-Intensity Correlation

  11. Correlated Condition

  12. Anti-Correlated Condition

  13. 1. Grey Silhouette

  14. 2. Pair of Probes

  15. 3. Test: Which is higher ?

  16. 1 0.8 0.6 0.4 0.2 0 Which is higher ? N=17 percent correct _ + Correlation

  17. Which is brighter ?

  18. 1 0.8 0.6 0.4 0.2 0 Which is brighter ? height N=10 brightness percent correct _ + Correlation

  19. Computational Modeling I(x) =  (x) (Langer and Zucker ‘93)     I(x) = N(x) L d L  (x) (Stewart and Langer ‘96)

  20. + - + - + - Human - Models 1 0.8 0.6 percent correct 0.4 0.2 0 human LZ ‘93 SL ‘96

  21. Conclusion • “Dark-means-deep” cannot account for shape-from-shading perception under diffuse lighting. • Point source models are insufficient. • Our visual system uses a more accurate physical model which is based on the angle of the visible light source.

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