Abhijeet Ghosh: “Estimating Diffusion Parameters from Polarized Spherical Gradient Illumination”

August 6, 2012 | Los Angeles, CA

Speaker: Abhijeet Ghosh
Host: SIGGRAPH 2012

Abstract: Accurately modeling and reproducing the appearance of real-world materials is crucial for the production of photoreal imagery of digital scenes and subjects. The appearance of many common materials is the result of subsurface light transport that gives rise to the characteristic “soft” appearance and the unique coloring of such materials. Jensen et al. [2001] introduced the dipole-diffusion approximation to efficiently model isotropic subsurface light transport. The scattering parameters needed to drive the dipole-diffusion approximation are typically estimated by illuminating a homogeneous surface patch with a collimated beam of light, or in the case of spatially varying translucent materials with a dense set of structured light patterns. A disadvantage of most existing techniques is that acquisition time is traded off with spatial density of the scattering parameters.