Concept

Espace vectoriel

Publications associées (368)

Segmentation of Natural Images Using Scale-Space Representations: A Linear and a Non-Linear Approach

Pierre Vandergheynst, Oscar Divorra Escoda

In general purpose computer vision systems, unsupervised image analysis is mandatory in order to achieve an automatic operation. In this paper a different approach to image segmentation for natural scenes is presented. Scale-Space representation is used to ...

IEEE2002

Mesure des variations infinitésimales des courbures principales d'une surface

We consider a surface S and a vector field u on S. We introduce a tensor χ(u) which measures the infinitesimal variations of the principal curvatures of S subject to u. ...

2002

Novel constructs and vectors for the targeted and inducible expression of genes

Johan Auwerx

The invention concerns novel constructs and novel vectors for the targeted and inducible expression of genes. It describes in particular novel hybrid promoters and their use for the expression of genes in hepatic cells, in vitro, ex vivo or in vivo ...

2002

3-D Reconstruction of DNA Filaments from Stereo Cryo-Electron Micrographs

Michaël Unser, Thierry Blu, Mathews Jacob

We propose an algorithm for the 3-D reconstruction of DNA filaments from a pair of stereo cryo-electron micrographs. The underlying principle is to specify a 3-D model of a filament—described as a spline curve—and to fit it to the 2-D data using a snake-li ...

IEEE2002

Abstracting Remote Object Interaction in a Peer-2-Peer Environment

Patrick Eugster

Leveraged by the success of applications aiming at the ``free'' sharing of data in the Internet, the paradigm of peer-to-peer (P2P) computing has been devoted substantial consideration recently. This paper presents an abstraction for remote object interact ...

2002

A library for computing the filtered and non-filtered 3D Green's tensor associated with infinite homogeneous space and surfaces

Olivier Martin

We describe a library to compute various types of Green's tensor for three-dimensional electromagnetic scattering calculations. This library includes the retarded and non-retarded (quasi-static) Green's tensors for infinite homogeneous space and the non-re ...

Elsevier2002

Variational Approach to Tomographic Reconstruction

Michaël Unser, Thierry Blu

We formulate the tomographic reconstruction problem in a variational setting. The object to be reconstructed is considered as a continuous density function, unlike in the pixel-based approaches. The measurements are modeled as linear operators (Radon trans ...

SPIE2001

Segmentation of Natural Images by Non-linear Scale-Space linking

Pierre Vandergheynst

A new method of image segmentation based on building up a hierarchical tree through non-linear scale-space is proposed. Non-linear scale space creates from the original image the whole family of blurred images but keeps sharp region boundaries. This charac ...

2001

Fast and accurate modeling of waveguide grating couplers. II. Three-dimensional vectorial case

Jan Sickmann Hesthaven

A boundary variation method for the fast and accurate modeling of three-dimensional waveguide grating couplers is presented. The algorithm is verified by detailed comparisons with the results of a rigorous spectral collocation method, showing excellent agr ...

OPTICAL SOC AMER2001

Future space - A new blueprint for business architecture

Jeffrey Huang

Although the Internet is an essential conduit for many business activities, it isn't rendering the physical world any less important, as the failures of many Web merchants demonstrate. People need social and sensual contact. The companies that succeed will ...

2001

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