Acquisition of Time-Varying Participating Media (2007)
Hawkins, Tim, Einarsson, Per, Debevec, Paul
We present a technique for capturing time-varying volumetric data of participating media. A laser sheet is swept repeatedly through the volume, and the scattered light is imaged using a high-speed...
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...
Real-Time High-Dynamic Range Texture Mapping (2007)
Cohen, Jonathan, Tchou, Christ, Hawkins, Tim, Debevec, Paul
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...
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...
Modelling from Multiple Photographs Using Points and Silhouettes (2004)
gh-resolution mesh is produced by subdividing the coarse mesh and aligning the subdivided mesh's projected silhouettes simultaneously to the marked silhouettes of the sculpture in all of the...
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...
Photometric Stereo for Archeological Inscriptions (sketches 0338) (2004)
Per Einarsson, Tim Hawkins, Paul Debevec
One of the input image for an inscription on a column of the Parthenon. The light-capturing frame (Fig. 1) consists of fiducials and MacBeth color checker chart samples, from which the camera's...
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...
Inverse Global Illumination: Recovering Reflectance Models of Real (2002)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
In this paper we present a method for recovering the reflectance properties of all surfaces in a real scene from a sparse set of photographs, taking into account both direct and indirect...
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...
Inverse Global Illumination: Recovering Reflectance Models of Real (2002)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
In this paper we present a method for recovering the reflectance properties of all surfaces in a real scene from a sparse set of photographs, taking into account both direct and indirect...
Inverse Global Illumination: Recovering Reflectance Models of Real (2002)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
In this paper we present a method for recovering the reflectance properties of all surfaces in a real scene from a sparse set of photographs, taking into account both direct and indirect...
A Photometric Approach to Digitizing Cultural Artifacts (2001)
Tim Hawkins, Jonathan Cohen, Paul Debevec
In this paper we present a photometry-based approach to the digital documentation of cultural artifacts. Rather than representing an artifact as a geometric model with spatially varying reflectance...
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...
Inverse Global Illumination: Recovering Reflectance Models of Real Scenes from Photographs (1999)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
In this paper we present a method for recovering the reflectance properties of all surfaces in a real scene from a sparse set of photographs, taking into account both direct and indirect...
Inverse Global Illumination: Recovering Reflectance Models of Real Scenes from Photographs (1999)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
In this paper we present a method for recovering the reflectance properties of all surfaces in a real scene from a sparse set of photographs, taking into account both direct and indirect...
Inverse Global Illumination: Recovering Reflectance Models of Real Scenes from Photographs (1999)
Yizhou Yu, Paul Debevec, Jitendra Malik, Tim Hawkins
We present a technique for recovering spatially varying reflectance parameters of real environments from photographs taking into account mutual illumination. The techniques fits to a low-parameter...
Hawkins, Tim, Schneider, Stefan, Alfano, Angelo, Vaghjiani, Gammy, Mills, Jeff, Hall, Leslie, ...
This documents reports on: 1) Recent Ionic Liquid Synthesis and Characterization; 2) Ionic Liquid Fuel for Biopropulsion; 3) Ionic Liquids in Munitions; 4) Energetic Ionic Liquids for TNT...