Concept

Détection d'anomalies

Publications associées (217)

A Novel Replica Detection System using Binary Classifiers, R-trees, and PCA

Replica detection is a prerequisite for the discovery of copyright infringement and detection of illicit content. For this purpose, contentbased systems can be an efficient alternative to watermarking. Rather than imperceptibly embedding a signal, content- ...

IEEE2006

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

Accurate detection, localization and tracking of multiple moving speakers permits a wide spectrum of applications. Techniques are required that are versatile, robust to environmental variations, and not constraining for non-technical end-users. Based on di ...

IDIAP2006

Spatio-Temporal Analysis of Spontaneous Speech with Microphone Arrays

Guillaume Lathoud

École Polytechnique Fédérale de Lausanne2006

Counting pedestrians in video sequences using trajectory clustering

Jean-Philippe Thiran, Gianluca Antonini

In this paper we propose to use clustering methods for automatic counting of pedestrians in video sequences. As input, we consider the output of those detection/ tracking systems that overestimate the number of targets. Clustering techniques are applied to ...

2006

Behavioral Analysis of Mobile Robot Trajectories Using a Point Distribution Model

Alcherio Martinoli, Jacques Jacot, Pierre Roduit

In recent years, the advent of robust tracking systems has enabled behavioral analysis of individuals based on their trajectories. An analysis method based on a Point Distribution Model (PDM) is presented here. It is an unsupervised modeling of the traject ...

2006

Semi-supervised Adapted HMMs for Unusual Event Detection

Daniel Gatica-Perez, Samy Bengio, Dong Zhang

We address the problem of temporal unusual event detection. Unusual events are characterized by a number of features (rarity, unexpectedness, and relevance) that limit the application of traditional supervised model-based approaches. We propose a semi-supe ...

2005

Threshold Selection for Unsupervised Detection, with an Application to Microphone Arrays

Hervé Bourlard, Jean-Marc Odobez, Guillaume Lathoud

Detection is usually done by comparing some criterion to a threshold. It is often desirable to keep a performance metric such as False Alarm Rate constant across conditions. Using training data to select the threshold may lead to suboptimal results on test ...

IDIAP2005

Semi-supervised Meeting Event Recognition with Adapted HMMs

Daniel Gatica-Perez, Samy Bengio, Dong Zhang

This paper investigates the use of unlabeled data to help labeled data for audio-visual event recognition in meetings. To deal with situations in which it is difficult to collect enough labeled data to capture event characteristics, but collecting a large ...

2005

Semi-supervised Meeting Event Recognition with Adapted HMMs

Daniel Gatica-Perez, Samy Bengio, Dong Zhang

IDIAP2005

A discrete choice modeling framework for pedestrian walking behavior with application to human tracking in video sequences

Gianluca Antonini

Intelligent Transportation Systems (ITS) have triggered important research activities in the context of behavioral dynamics. Several new models and simulators for driving and travel behaviors, along with new integrated systems to manage various elements of ...

EPFL2005

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