Centre de Mathématiques et de Leurs Applications

Double seminaire du jeudi 27 mai 2010

----------------------------------------------------------------

11h15-12h

Premier orateur: Robert Strain (Univ. Penn.)

Titre: Global Classical Solutions of the Boltzmann Equation with Long-Range Interactions nearby Maxwellian

Resume:

---------------------------------------------------------------

12h-12h45

Deuxième orateur: Perez Patrick

Titre: Geodesic Image and Video Editing

Résumé:

Joint work with A. Criminisi, T. Sharp and C. Rother (Microsoft Research Cambridge)

We introduce a generalized geodesic distance transform (GGDT) on soft masks, which
provides a unified framework to address several, edge-aware editing operations.
Diverse editing tasks such as de-noising and non-photorealistic rendering, are all
dealt efficiently with fundamentally the same, fast algorithm. Also based GGDT, a
new, geodesic, symmetric filter (GSF) is presented which imposes contrast-sensitive
spatial smoothness into segmentation and segmentation-based editing tasks (cutout,
object highlightening, colorization, panorama stitching). The effect of the filter
is controlled by two intuitive, geometric parameters. In contrast to existing
techniques, the GSF filter is applied to real-valued pixel likelihoods (soft masks),
thanks to GGDTs and it can be used for both interactive and automatic editing tasks.
Complex object topologies are dealt with effortlessly. Finally, the parallelism of
GGDTs enables us to exploit
modern multi-core CPU architectures as well as powerful new GPUs, thus providing
great flexibility of implementation and deployment. Our technique operates on both
images and videos, and generalizes naturally to n-dimensional data. The proposed
algorithm is validated via quantitative and qualitative comparisons with existing,
state of the art approaches. Numerous results on a variety of image and video
editing tasks further demonstrate the effectiveness of our method.