NDLI: Linear light source reflectometry

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Linear light source reflectometry

Content Provider	ACM Digital Library
Author	Hawkins, Tim Tchou, Chris Debevec, Paul Gardner, Andrew
Abstract	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 rather than a point light source as the illuminant, we are able to reliably observe and estimate the diffuse color, specular color, and specular roughness of each point of the surface. The reflectometry apparatus we use is simple and inexpensive to build, requiring a single direction of motion for the light source and a fixed camera viewpoint. Our model fitting technique first renders a reflectance table of how diffuse and specular reflectance lobes would appear under moving linear light source illumination. Then, for each pixel we compare its series of intensity values to the tabulated reflectance lobes to determine which reflectance model parameters most closely produce the observed reflectance values. Using two passes of the linear light source at different angles, we can also estimate per-pixel surface normals as well as the reflectance parameters. Additionally our system records a per-pixel height map for the object and estimates its per-pixel translucency. We produce real-time renderings of the captured objects using a custom hardware shading algorithm. We apply the technique to a test object exhibiting a variety of materials as well as to an illuminated manuscript with gold lettering. To demonstrate the technique's accuracy, we compare renderings of the captured models to real photographs of the original objects.
Starting Page	749
Ending Page	758
Page Count	10
File Format	PDF MP4
ISBN	1581137095
DOI	10.1145/1201775.882342
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2003-07-27
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Audio Text
Resource Type	Article

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