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Natural materials often exhibit complex reflectance and intricate geometry posing a real challenge in surface modeling. We investigate this problem in our volumetric surface reconstruction and modeling project. In the process, we have compiled a database of several complex volumetric surface textures. We have decided to make this valuable resource available to other researchers interested in the topic.
The database contains a number of textures observed for varying view and illumination directions. It was created at the Beckman Institute at the University of Illinois at Urbana-Champaign. The acquisition setup shown on a diagram below used a stationary Canon XL1 camcorder and a white OTLWHTA-5-10-66-E light-emitting diode controlled with an AdeptOne-MV robot. A texture sample was mounted on a custom-designed robotic pan-tilt table mount:
|Sample raw images:|
All textures were sampled over a hemisphere every 15° for the light and every 20° for the view in both the elevation and the rotation angle. This resulted in a total of over 10,000 sample images for each texture. All textures were captured at 100DPI for their frontal views.
Texture data sets can be post-processed into a standard sampled Bidirectional Texture Function (BTF) representation. Below are a few BTF samples of a processed 'carpet' texture data set showing the effects of changing the elevation of the light and the view directions:
|Light direction elevation:|
|View direction elevation:|
We are also providing a few texture sets with dense 2° sampling of the light direction. These were done only for the frontal view direction. The current availability status of each texture is indicated in the table below:
|Texture:||Name:||Raw data availability (view and lighting):||BTF representation availability:||Dense 2° data availability (lighting only):|
|Last updated : January 12 2007