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CATS - Malzbender


Image Based Relighting and Immersive Telepresence
Hewlett-Packard Labs

In the first part of the talk we present a new form of texture mapping that produces increased photorealism. Coefficients of a biquadratic polynomial are stored per texel, and used to reconstruct the surface color under varying lighting conditions. Like bump mapping, this allows the perception of surface deformations. However, our method is image based, and photographs of a surface under varying lighting conditions can be used to construct these maps. Unlike bump maps, these Polynomial Texture Maps (PTMs) also capture variations due to surface self-shadowing and interreflections, which enhance realism. Surface colors can be efficiently reconstructed from polynomial coefficients and light directions with minimal fixed-point hardware. We have found PTMs useful for producing a number of other effects such as anisotropic and Fresnel shading models and variable depth of focus. Lastly, we present several reflectance function transformations that act as contrast enhancement operators. We have found these particularly useful in the study of ancient archeological clay and stone writings, paleontology and forensics.

The second part of the talk describes an immersive teleconferencing system that we are prototyping. View synthesis methods from computer vision and view dependent texture mapping methods from computer graphics are employed to embed users in a synthetic environment where mobility and eye contact are possible.

Refreshments will be served immediately following the presentation.

The Colorado Advanced Technology Series wants to introduce students at the University of Colorado to the technology leaders of local and national industries and help the leaders of those companies explain what their companies do and why they are great places to work. If you would like to receive email notification of upcoming talks, subscribe to our CATS Mailing List.

The main event of CATS is a series of technical talks in the middle of each semester. In each seminar, a technical or business leader from a local or national company describes new or existing technical developments, the motivation for developing that technology and the corporate environment. Each seminar is followed by refreshments and a chance for students and industry representatives to mingle and talk. See CATS Frequently Asked Questions for further information.

See also:
Department of Computer Science
College of Engineering and Applied Science
University of Colorado Boulder
Boulder, CO 80309-0430 USA
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May 5, 2012 (13:40)