Postproduction Re-Illumination of Live Action Using Time-Multiplexed Lighting (2007)
Debevec, Paul, Gardber, Andrew, Tchou, Chris, Hawkins, Tim
In this work, we present a technique for capturing a time-varying human performance in such a way that it can be re-illuminated in postproduction. The key idea is to illuminate the subject with a...
Direct HDR Capture of the Sun and Sky (2004)
Jessi Stumpfel, Andrew Jones, Andreas Wenger, Chris Tchou, Tim Hawkins, Paul Debevec
We present a technique for capturing the extreme dynamic range of natural illumination environments that include the sun and sky, which has presented a challenge for traditional high dynamic range...
Postproduction Re-Illumination of Live Action Using Time-Multiplexed Lighting (2004)
Paul Debevec, Andrew Gardner, Chris Tchou, Tim Hawkins
In this work, we present a technique for capturing a time-varying human performance in such a way that it can be re-illuminated in postproduction. The key idea is to illuminate the subject with a...
Postproduction Re-Illumination of Live Action Using Interleaved Lighting (2004)
Andrew Gardner, Chris Tchou, Andreas Wenger, Tim Hawkins, Paul Debevec
essive streams and take linear combinations of the lighting configurations to produce a novel illumination of the performance running at 30fps (Fig. 2). Our second experiment uses a two meter sphere...
Direct HDR Capture of the Sun and Sky (2004)
Jessi Stumpfel, Andrew Jones, Andreas Wenger, Chris Tchou, Tim Hawkins, Paul Debevec
sky brightness can change drastically with sun position and weather. The camera control is designed to analyze images as they are downloaded to determine the necessary camera settings for the HDR...
Unlighting the Parthenon (2004)
Chris Tchou, Jessi Stumpfel, Per Einarsson, Marcos Fajardo, Paul Debevec
aph of the structure: (a) Render the surfaces of the scene with a global illumination algorithm, using the photograph's viewpoint and lighting (b) Determine a reflectance update map by comparing the...
Assembling the Sculptures of the Parthenon (2003)
Jessi Stumpfel, Chris Tchou, Tim Hawkins, Paul Debevec, Jonathan Cohen, Andrew Jones, ...
e light onto the casts with the video projector. Because of the efficiency of the system, we were able to scan over 440 linear feet of frieze, 52 metopes, and both pediments in just five days with a...
Linear Light Source Reflectometry (2003)
Andrew Gardner, Chris Tchou, Tim Hawkins, Paul Debevec
This paper presents a technique for estimating the spatially-varying reflectance properties of a surface based on its appearance during a single pass of a linear light source. By using a linear light...
Acquiring the Reflectance Field of a Human Face (2002)
Paul Debevec, Tim Hawkins, Chris Tchou, Haarm-pieter Duiker, Westley Sarokin
We present a method to acquire the reflectance field of a human face and use these measurements to render the face under arbitrary changes in lighting and viewpoint. We first acquire images of the...
A Lighting Reproduction Approach to Live-Action Compositing (2002)
Paul Debevec, Andreas Wenger, Chris Tchou, Andrew Gardner, Jamie Waese, Tim Hawkins
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...
Real-Time High-Dynamic Range Texture Mapping (2001)
Jonathan Cohen, Chris Tchou, Tim Hawkins, Paul Debevec
This paper presents a technique for representing and displaying high dynamic-range texture maps (HDRTMs) using current graphics hardware. Dynamic range in real-world environments often far exceeds...
Acquiring the Reflectance Field of a Human Face (2000)
Paul Debevec, Tim Hawkins, Chris Tchou, Haarm-pieter Duiker, Westley Sarokin
We present a method to acquire the reflectance field of a human face and use these measurements to render the face under arbitrary changes in lighting and viewpoint. We first acquire images of the...
A Schema Based Approach To Dialog Control (1999)
Paul C. Constantinides, Scott Hansma, Chris Tchou, Er I. Rudnicky
Frame-based approaches to spoken language interaction work well for limited tasks such as information access, given that the goal of the interaction is to construct a correct query then execute it....