Broad Area Colloquium For AI-Geometry-Graphics-Robotics-Vision
(CS 528)

Image-Based Techniques for Relighting People, Places, and Things

Paul Debevec, USC
September 26, 2005, 4:15PM
Hewlett (TCSeq) 200


Image-Based Relighting synthesizes images of people, objects, or places in new illumination conditions based on photographs of the subject under example lighting conditions. Such techniques complement traditional image-based modeling and rendering techniques, allowing the acquisition of computer graphics representations of real-world subjects where control of lighting and viewpoint can be chosen according to a particular visualization need or creative vision. In this talk I will describe three recent efforts in acquiring relightable image-based models of people, places, and things. First, I will present a real-time light stage device that uses time-multiplexed LED lighting and high speed photography to capture a relightable movie of a human performance, including the possibility of reproducing spatially-varying lighting. Second, I will describe a dual light stage device that leverages a bright laser beam and the reversibility of light transport to capture relightable images of objects with arbitrarily high specular reflectance or translucency. Finally, I will describe an environmental reflectometry process used to capture a relightable 3D model of the Parthenon on the Athenian Acropolis and to reunite it with its sculptures in the British Museum.

Joint work with Andreas Wenger, Chris Tchou, Tim Hawkins, Per Einarsson, Andrew Gardner, Jonas Unger, Andrew Jones, Mark Bolas, Ian MacDowall, Charis Poullis, Jessi Stumpfel, Andrew Jones, Nathaniel Yun, Therese Lundgren, Marcos Fajardo, and Philippe Martinez

About the Speaker

Paul Debevec is a research assistant professor at the University of Southern California (USC) and directs the graphics laboratory at USC's Institute for Creative Technologies. His Ph.D. thesis at UC Berkeley presented Facade, an image-based modeling and rendering system for creating photoreal architectural models from photographs. He subsequently developed techniques for illuminating computer-generated scenes with real-world lighting captured through high dynamic range photography, demonstrating new image-based lighting techniques in his animations "Rendering with Natural Light", "Fiat Lux", and "The Parthenon". He has also led the design of HDR Shop, the first widely-used high dynamic range image editing program. Debevec's recent work has produced several light stage devices that allow objects, actors, and performances to be synthetically illuminated with novel lighting, recently used to create photoreal digital actors for the 2004 film "Spider-Man 2". Debevec received ACM SIGGRAPH's Significant New Researcher Award in 2001.


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