The annotation of images data is the main tool for associating semantics to an image. In this article we are interested in the semi-automatic annotation of images data. Indeed, with the great mass of data managed throughout the world and especially with the Web, the manual annotation of these images is almost impossible. This article presents a preliminary work on an neighbourhood graphs based ...

Rodent monitoring in biomedical laboratories is a time consuming and tedious task. Several automatic solutions that rely on different types of sensors have been proposed. Computer vision provides a significantly more universal and less intrusive solution. In this article we propose a new method to detect and classify three behaviors in rodents: Exploring, Rearing, and Static. The method uses Mo...

Sparse approximation has shown to be a significant tool in improving image restoration quality, assuming that the targeted images can be approximately sparse under some transform operators. However, it is impossible for a fixed system to be always optimal for all the images. In this paper, we present an adaptive wavelet tight frame technology for sparse representation of an image with multiplic...

W hat is it?,” Sierra Rodriguez asked her older brother. “You’ll have to guess,” Billy answered. Sierra looked up at the object that was hanging —almost as if levitating —from two crisscrossed cables in the barn. “Does it y?” she asked. “Nope. It lights up.” “So you mean it’s just a light,” she said, glaring at her brother. “What’s so special about—” “It’s not just a light.” Billy began moving ...

In recent years, there has been a growing interest in computer graphics and geometric modeling in the ability to create and manipulate Seemingly Impossible Models (SIMs). Methods to create derivative work and modify drawings and paintings of SIMs made by artists were suggested. Similarly, 3D realization of SIMs of some of these drawings were also offered. In this work, we further explore the na...

This article develops new techniques to classify critical configurations for 3D scene reconstruction from images taken by unknown cameras. Generally, all information can be uniquely recovered if enough and image points are provided, but there certain cases where unique recovery is impossible; these called configurations. In this paper, we use an algebraic approach study the two projective We sh...

We present time-series Doppler images of the rapidly-rotating active binary star EI Eri from spectroscopic observations collected during the MUSICOS multi-site campaign in 1998, since the critical rotation period of 1.947 days makes it impossible to obtain time-resolved images from a single site. From the surface reconstructions a weak solar-type differential rotation, as well as a tiny polewar...

The image points in two images satisfy epipolar constraint. However, not all sets of points satisfying epipolar constraint correspond to any real geometry because there can exist no cameras and scene points projecting to given image points such that all image points have positive depth. Using the cheirality theory due to Hartley and previous work on oriented projective geometry, we give necessa...

Feature vectors that are used to represent images exist in a very high dimensional space. Usually, a parametric characterization of the distribution of this space is impossible. It is generally assumed that the features are able to locate visually similar images close in the feature space so that non-parametric approaches, like the k-nearest neighbor search, can be used for retrieval. This pape...