Publications de Javier Cruz Mota

Sample and Pixel Weighting Strategies for Robust Incremental Visual Tracking

Jean-Philippe Thiran, Michel Bierlaire, Javier Cruz Mota

In this paper, we introduce the incremental temporally weighted principal component analysis (ITWPCA) algorithm, based on singular value decomposition update, and the incremental temporally weighted visual tracking with spatial penalty (ITWVTSP) algorithm ...

Institute of Electrical and Electronics Engineers2013

Scale Invariant Feature Transform on the Sphere: Theory and Applications

Jean-Philippe Thiran, Michel Bierlaire, Iva Bogdanova Vandergheynst, Javier Cruz Mota

A SIFT algorithm in spherical coordinates for omnidirectional images is proposed. This algorithm can generate two types of local descriptors, Local Spherical Descriptors and Local Planar Descriptors. With the first ones, point matching between two omnidire ...

Springer Verlag2012

Dynamic facial expression recognition with a discrete choice model

Michel Bierlaire, Thomas Robin, Javier Cruz Mota

A generation of new models has been proposed to handle some complex human behaviors. These models account for the data ambiguity, and there- fore extend the application field of the discrete choice modeling. The facial expression recognition (FER) is highl ...

2011

Model-based Behavioural Tracking and Scale Invariant Features in Omnidirectional Matching

Javier Cruz Mota

Two classical but crucial and unsolved problems in Computer Vision are treated in this thesis: tracking and matching. The first part of the thesis deals with tracking, studying two of its main difficulties: object representation model drift and total occlu ...

EPFL2011

Modelling human perception of static facial expressions

Jean-Philippe Thiran, Michel Bierlaire, Matteo Sorci, Gianluca Antonini, Thomas Robin, Javier Cruz Mota

A recent internet based survey of over 35'000 samples has shown that when different human observers are asked to assign labels to static human facial expressions, different individuals categorize differently the same image. This fact results in a lack of a ...

2010

Specification, estimation and validation of a pedestrian walking behavior model

Michel Bierlaire, Gianluca Antonini, Thomas Robin, Javier Cruz Mota

We propose and validate a model for pedestrian walking behavior, based on discrete choice modeling. Two main types of behavior are identified: unconstrained and constrained. By unconstrained, we refer to behavior patterns which are independent from other i ...

2009

Modelling human perception of static facial expressions

Jean-Philippe Thiran, Michel Bierlaire, Matteo Sorci, Gianluca Antonini, Javier Cruz Mota, Barbara Cerretani

Data collected through a recent web-based survey show that the perception (i.e. labeling) of a human facial expression by a human observer is a subjective process, which results in a lack of a unique ground-truth, as intended in the standard classification ...

2008

Fast multi-view face tracking with pose estimation

Jean-Philippe Thiran, Julien Meynet, Javier Cruz Mota

In this paper, a fast and an effective multi-view face tracking algorithm with head pose estimation is introduced. For modeling the face pose we employ a tree of boosted classiﬁers built using either Haar-like ﬁlters or Gauss ﬁlters. A ﬁrst classiﬁer extra ...

2008