This paper discusses the security issues in data driven coordination languages. These languages rely on a data space shared by the agents and used to coordinate their activities. We extend these languages with a main distinguishing feature, which is the possibility to define fine-grained security conditions, associated with every datum in the shared space. Two main ideas makes it possible: the ...

II. 3-D Motion Estimation The approach for 3-D motion estimation in this project has two stages: 3-D shape reconstruction and model-based 3-D motion estimation. The object shape in a video sequence is usually unknown. A structure from motion algorithm is first applied to reconstruct an approximate 3D shape from several views of the video sequence. With the approximate object shape, a model-base...

In this paper we present the equations and some basic applications of relativistic SPH. The equations are generated under the assumption that there are no interaction terms between the fluid modelled and the background space-time, i.e. we are neglecting the perturbations to the metric produced by the modelled fluid. This corresponds to a stationary metric, which for this work, we further limit ...

Estimation of local surface geometry (i.e. principle frame and principle quadric) is discussed. It is shown that surface tting methods are more robust that-nite diierence based approaches for a number of reasons. The local surface geometry is used to segment the surfaces into regions corresponding to smooth patches, separated by visibility boundaries, occluding contours, and ridges. Points with...

In this contribution we intend to present a complete system that takes a video sequence of a static scene as input and generates visual 3D model. The system can deal with images acquired by an uncalibrated hand-held camera, with intrinsic camera parameters possibly varying during the acquisition. In a first stage features are extracted and tracked throughout the sequence. Using robust statistic...