James A. Ferwerda Sumanta N. Pattanaik Peter Shirley Donald P. Greenberg A Model of Visual Adaptation for Realistic Image Synthesis By Nigel Thomas 10/22/04.

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James A. Ferwerda Sumanta N. Pattanaik Peter Shirley Donald P. Greenberg A Model of Visual Adaptation for Realistic Image Synthesis By Nigel Thomas 10/22/04

Nigel Thomas Washington University in St. Louis Media & Machines Lab 2 Overview Introduction Physiological foundations of adaptation A psychophysical model of adaptation Implementation Results Conclusion / Future Work

Nigel Thomas Washington University in St. Louis Media & Machines Lab 3 Introduction Human eye

Nigel Thomas Washington University in St. Louis Media & Machines Lab 4 Introduction Luminance in natural environments

Nigel Thomas Washington University in St. Louis Media & Machines Lab 5 Physiological foundation of adaptation The pupil The rod and cone systems Bleaching and regeneration of photopigments Neural processes

Nigel Thomas Washington University in St. Louis Media & Machines Lab 6 A psychophysical model of adaptation Threshold studies

Nigel Thomas Washington University in St. Louis Media & Machines Lab 7 A psychophysical model of adaptation Changes in color appearance

Nigel Thomas Washington University in St. Louis Media & Machines Lab 8 A psychophysical model of adaptation Changes in color appearance

Nigel Thomas Washington University in St. Louis Media & Machines Lab 9 A psychophysical model of adaptation Measuring visual acuity  Snellen Acuity Chart

Nigel Thomas Washington University in St. Louis Media & Machines Lab 10 A psychophysical model of adaptation Measuring visual acuity

Nigel Thomas Washington University in St. Louis Media & Machines Lab 11 A psychophysical model of adaptation The time-course of light adaptation - Rods

Nigel Thomas Washington University in St. Louis Media & Machines Lab 12 A psychophysical model of adaptation The time-course of light adaptation - Cones

Nigel Thomas Washington University in St. Louis Media & Machines Lab 13 A psychophysical model of adaptation The time-course of dark adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 14 Implementation Acuity Light Adaptation Dark Adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 15 Results Visual function across the range of light

Nigel Thomas Washington University in St. Louis Media & Machines Lab 16 Results Image sequence showing the time-course of light adaptation Image sequence showing the time-course of dark adaptation

Nigel Thomas Washington University in St. Louis Media & Machines Lab 17 Conclusion / Future Work Computational model of the changes in the visual function that are produced by adaptation. A more complete model of adaptation will result in advances in realistic image synthesis

Nigel Thomas Washington University in St. Louis Media & Machines Lab 18 Questions? ?

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