TUM Informatik-Kolloquium: Jun. Prof. Dr. Oliver Bimber
Termin: Donnerstag, den 27.07.06, 17:30 Uhr
Ort: Raum 00.08.038 (MI-Gebäude, Campus Garching)
No Screens Required!
Information Displays play an important role in our society. Television,
for instance, is currently following the evolution of graphics displays
? a transformation from small and bulky cubes to large and flat planes.
Projectors allow creating images that are larger than the devices
themselves. Thus, they enable efficient human-computer interfaces and
enable the visualization of two- and three-dimensional content.
Projection-technology is evolving rapidly ? enabling a variety of new
display forms. A similar evolution can be observed for graphics chips.
Today?s GPUs streaming-oriented SIMD architectures enable a variety of
real-time computations that make many new applications possible ?
including novel projection techniques.
Current research activities investigate conceptual and technical
possibilities for realizing graphical visualizations in real world
environments. They strive for enabling immersive and semi-immersive
projection experiences without the need for special display surfaces or
permanent screen configurations. Enabling visualizations without
projection-optimized screens but on complex everyday surfaces leads to
new applications in many fields ? but also to several difficulties: The
projected images are geometrically warped, color and intensity blended,
and regionally defocused. Thus, projected images have to be corrected in
real-time and on a pixel-precise basis. In addition, other surface
properties, such as depth information and global light modulation
effects can be extracted and human perception factors can be taken into
account for improving the final image quality.
This talk begins with a brief discussion on projector-based illumination
solutions that allow overcoming several limitations of spatial augmented
reality displays. It focuses on real-time image correction techniques,
such as geometric warping, radiometric compensation, reverse radiosity,
and multi-focal projection that enable visualizations on complex
surfaces in everyday environments. Finally, a generalized correction
approach based on the reversed light transport is introduced. It
represents the union of existing methods that handle individual light
modulation effects.
More information can be found at www.uni-weimar.de/medien/AR
