Research
| | Image
Restoration using Online Photo Collections. Here we demonstrate an
image restoration method that leverages a large database of images
gathered from the web. We build an image-specific prior using the
nearest neighbors from the database, which is used in automatic white
balance, exposure, and contrast correction. Our results show that
these simple priors consistently out-perform generic and even
domain-specific priors for these operations.
K. Dale, M.K. Johnson, K. Sunkavalli, W. Matusik, and
H. Pfister. Image Restoration using Online Photo Collections.
Proceedings of the IEEE International Conference on Computer
Vision (ICCV), Sept 2009. To appear. |
| | Multidimensional
Adaptive Sampling for Ray Tracing. We've developed a new adaptive
sampling strategy for sampling over high dimensional domains, such
as those that occur when rendering with effects like depth of field,
motion blur, and glossy reflection. Our technique compares favorably
to existing adaptive sampling strategies in terms of artifacts and
overall image quality for same-time comparisons.
T. Hachisuka, W. Jaroz, R. P. Weistroffer, K. Dale, G. Humphreys,
M. Zwicker, and H. W. Jensen. Multidimensional Adaptive
Sampling and Reconstruction for Ray Tracing. ACM Transactions
on Graphics (Proceedings of SIGGRAPH), 2008.
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| | Graphics
Hardware for Radio Astronomy. The Murchison
Widefield Array (MWA) is a next-generation radio telescope being
built in the Australian outback to study the early universe, sun, and
sky transients. It will be a software telescope, dependent
on real-time high performance computing on site. Early GPU trials
have demonstrated an average speedup of 10x over CPU implementations,
and our group is currently expanding the test pipeline across
a GPU cluster.
K. Dale, D. Mitchell, R. Wayth, S. Ord, L. Greenhill, D. Luebke,
and H. Pfister. A
Graphics Hardware-Accelerated Real-Time Processing Pipeline for
Radio Astronomy. AstroGPU 2007. (slides)
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| Small-Scale
Reconfigurability (SSR) in Graphics Processors. In this work,
we show that SSR can be used effectively in programmable graphics
architectures to allow double-precision computation without affecting
the performance of single-precision calculations, and to increase
fragment shader performance with a minimal impact on chip area.
K. Dale, J. W. Sheaffer, V. Vijay Kumar, D. P. Luebke,
G. Humphreys, and K. Skadron. Small-Scale
Reconfigurability for Improved Performance and Double Precision in
Graphics Hardware, International Journal of
Electronics, 94(5), May 2007.
K. Dale, J. W. Sheaffer, V. Vijay Kumar, D. P. Luebke,
G. Humphreys, and K. Skadron. Applications of Small-Scale
Reconfigurability to Graphics Processors. Proceedings of
the International Workshop on Applied Reconfigurable
Computing (ARC), March 2006.
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| | Adaptive 3D
Scanning. Here, we're investigating the use of adaptive
techniques for rangefinder-based 3D scanning systems. Our
prototype device, composed of a laser rangefinder and a pair of
galvanometer-mounted mirrors, is part of a closed-loop system that
focuses scanning efforts on areas of low spatial and temporal
coherence in its field of view.
K. Dale, E. Cheslak-Postava, G. Humphreys, and D. P. Luebke.
Scanning and Reconstruction for Dynamic Surfaces.
Technical Report CS-2006-25, Department of Computer Science, UVA.
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