NDLI: Relighting human locomotion with flowed reflectance fields ( EGSR '06 )

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Relighting human locomotion with flowed reflectance fields

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Relighting human locomotion with flowed reflectance fields ( EGSR '06 )

Content Provider	ACM Digital Library
Author	Einarsson, Per Bolas, Mark Hawkins, Tim Jones, Andrew Chabert, Charles-Felix Lamond, Bruce Ma, Wan-Chun Debevec, Paul Sylwan, Sebastian
Abstract	We present an image-based approach for capturing the appearance of a walking or running person so they can be rendered realistically under variable viewpoint and illumination. In our approach, a person walks on a treadmill at a regular rate as a turntable slowly rotates the person's direction. As this happens, the person is filmed with a vertical array of high-speed cameras under a time-multiplexed lighting basis, acquiring a seven-dimensional dataset of the person under variable time, illumination, and viewing direction in approximately forty seconds. We process this data into a flowed reflectance field using an optical flow algorithm to correspond pixels in neighboring camera views and time samples to each other, and we use image compression to reduce the size of this data. We then use image-based relighting and a hardware-accelerated combination of view morphing and light field rendering to render the subject under user-specified viewpoint and lighting conditions. To composite the person into a scene, we use an alpha channel derived from back lighting and a retroreflective treadmill surface and a visual hull process to render the shadows the person would cast onto the ground. We demonstrate realistic composites of several subjects into real and virtual environments using our technique.
Starting Page	183
Ending Page	194
Page Count	12
ISBN	3905673355
ISSN	17273463
DOI	10.2312/EGWR/EGSR06/183-194
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2006-06-26
Publisher Place	Goslar
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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