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Daniel Gatica-Perez

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Related publications (115)

Privacy-Sensitive Audio Features for Speech/Nonspeech Detection

Hervé Bourlard, Mathew Magimai Doss, Daniel Gatica-Perez, Sree Hari Krishnan Parthasarathi

The goal of this paper is to investigate features for speech/nonspeech detection (SND) having low linguistic information from the speech signal. Towards this, we present a comprehensive study of privacy-sensitive features for SND in multiparty conversation ...

2011

Modeling and Understanding Flickr Communities through Topic-based Analysis

Daniel Gatica-Perez, Radu Andrei Negoescu

With the increased presence of digital imaging devices there also came an explosion in the amount of multimedia content available online. Users have transformed from passive consumers of media into content creators and have started organizing themselves in ...

2010

Probabilistic Mining of Socio-Geographic Routines from Mobile Phone Data

Daniel Gatica-Perez, Katayoun Farrahi

There is relatively little work on the investigation of large-scale human data in terms of multimodality for human activity discovery. In this paper we suggest that human interaction data, or human proximity, obtained by mobile phone Bluetooth sensor data, ...

2010

Estimating Cohesion in Small Groups Using Audio-Visual Nonverbal Behavior

Daniel Gatica-Perez

Cohesiveness in teams is an essential part of ensuring the smooth running of task-oriented groups. Research in social psychology and management has shown that good cohesion in groups can be correlated with team effectiveness or productivity, so automatical ...

2010

Mining group nonverbal conversational patterns using probabilistic topic models

Daniel Gatica-Perez, Dinesh Babu Jayagopi

The automatic discovery of group conversational behavior is a relevant problem in social computing. In this paper, we present an approach to address this problem by defining a novel group descriptor called bag of group-nonverbal-patterns defined on brief o ...

2010

Contextual classification of image patches with latent aspect models

Florent Monay Michaud, Jean-Marc Odobez, Pedro Manuel Da Silva Quelhas, Daniel Gatica-Perez

We present a novel approach for contextual classification of image patches in complex visual scenes, based on the use of histograms of quantized features and probabilistic aspect models. Our approach uses context in two ways: (1) by using the fact that spe ...

2009

Automatic nonverbal analysis of social interaction in small groups: A review

Daniel Gatica-Perez

An increasing awareness of the scientific and technological value of the automatic understanding of faceto- face social interaction has motivated in the past few years a surge of interest in the devising of computational techniques for conversational analy ...

2009

Modeling Dominance in Group Conversations using NonVerbal Activity Cues

Daniel Gatica-Perez, Dinesh Babu Jayagopi

Dominance - a behavioral expression of power - is a fundamental mechanism of social interaction, expressed and perceived in conversations through spoken words and audio-visual nonverbal cues. The automatic modeling of dominance patterns from sensor data re ...

2008

Tracking the visual focus of attention for a varying number of wandering people

Jean-Marc Odobez, Kevin Smith, Silèye Oumar Ba, Daniel Gatica-Perez

In this article, we define and address the problem of finding the visual focus of attention for a varying number of wandering people (VFOA-W) -- determining where a person is looking when their movement is unconstrained. VFOA-W estimation is a new and impo ...

2008

Modeling semantic aspects for cross-media image indexing

Florent Monay Michaud, Daniel Gatica-Perez

To go beyond the query-by-example paradigm in image retrieval, there is a need for semantic indexing of large image collections for intuitive text-based image search. Different models have been proposed to learn the dependencies between the visual content ...

2007

Human-centered Computing: Toward a Human Revolution

Daniel Gatica-Perez

Human-centered computing studies the design, development, and deployment of mixed-initiative human-computer systems. HCC is emerging from the convergence of multiple disciplines that are concerned both with understanding human beings and with the design of ...

2007

A Thousand Words in a Scene

Jean-Marc Odobez, Pedro Manuel Da Silva Quelhas, Daniel Gatica-Perez

This paper presents a novel approach for visual scene modeling and classification, investigating the combined use of text modeling methods and local invariant features. Our work attempts to elucidate (1) whether a text-like \emph{bag-of-visterms} represent ...

2007

Audio-visual probabilistic tracking of multiple speakers in meetings

Guillaume Lathoud, Jean-Marc Odobez, Daniel Gatica-Perez

Tracking speakers in multiparty conversations constitutes a fundamental task for automatic meeting analysis. In this paper, we present a probabilistic approach to jointly track the location and speaking activity of multiple speakers in a multisensor meetin ...

2006

Embedding Motion in Model-Based Stochastic Tracking

Jean-Marc Odobez, Silèye Oumar Ba, Daniel Gatica-Perez

Particle filtering (PF) is now established as one of the most popular methods for visual tracking. Within this framework, two assumptions are generally made. The first is that the data are temporally independent given the sequence of object states, and the ...

2006

Automatic Analysis of Multimodal Group Actions in Meetings

Samy Bengio, Mark Barnard, Guillaume Lathoud, Dong Zhang, Daniel Gatica-Perez

This paper investigates the recognition of group actions in meetings. A statistical framework is proposed in which group actions result from the interactions of the individual participants. The group actions are modelled using different HMM-based approache ...

2005

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