PAUL DEBEVEC

Paul Debevec is a researcher in computer graphics at the University of Southern California’s Institute for Creative Technologies. He is best known for his pioneering work in high dynamic range imaging and image-based modelling and rendering and has been a key speaker at the SIGGRAPH conventions since the late 90’s.

His work focuses mainly on simulations of spatially varying lighting techniques creating real world lighting apparatus that illuminate a person. The scene illumination data is generated to specify the illumination at the location in the scene from a plurality of spatial directions. The subject is then illuminated with the illumination at the location in the scene by driving a plurality of light sources surrounding the subject with the scene illumination data.

A two-meter sphere Lighting Stage of inward-pointing RGB light emitting diodes focused on the actor, where each light can be set to an arbitrary color and intensity to replicate a real-world or virtual lighting environment.
syntheticlighting2

‘We describe a process for compositing a live performance of an actor into a virtual set wherein the actor is consistently illuminated by the virtual environment. The Light Stage used in this work is a two-meter sphere of inward-pointing RGB light emitting diodes focused on the actor, where each light can be set to an arbitrary color and intensity to replicate a real-world or virtual lighting environment. We implement a digital two-camera infrared matting system to composite the actor into the background plate of the environment without affecting the visible-spectrum illumination on the actor. The color reponse of the system is calibrated to produce correct color renditions of the actor as illuminated by the environment. We demonstrate moving-camera composites of actors into real-world environments and virtual sets such that the actor is properly illuminated by the environment into which they are composited.’ – Debevec, http://gl.ict.usc.edu/Research/LS3/

Light Stage
syntheticlighting

This Light Stage is designed to move a small spotlight around a person’s head (or a small collection of objects) so that it is illuminated from all possible directions in a small period of time. From this data, we can then simulate the object’s appearance under any complex lighting condition. A set of stationary digital video cameras record the person or objects’ appearance as the light moves around, and for some of our models we precede the lighting run with a geometry capture process using structured light from a video projector.

A 1-minute-exposure photograph of a reflectance field capture session; the path of the spotlight is traced out as a spiraling luminous streak.
lightstage0011

http://www.debevec.org/

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