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Michel Bierlaire

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Publications associées (228)

Halton Sampling for Image Registration Based on Mutual Information

Philippe Thévenaz, Michaël Unser, Michel Bierlaire

Mutual information is a widely used similarity measure for aligning multimodal medical images. At its core it relies on the computation of a discrete joint histogram, which itself requires image samples for its estimation. In this paper we study the influe ...

Sampling Publishing2008

Object Detection and Matching with Mobile Cameras Collaborating with Fixed Cameras

Murat Kunt, Michel Bierlaire, Alexandre Massoud Alahi

A system is presented to detect and match any objects with mobile cameras collaborating with fixed cameras observing the same scene. No training data is needed. Various object descriptors are studied based on grids of region descriptors. Region descriptors ...

2008

Development of prototype UrbanSim models

Michel Bierlaire, Ricardo Daniel Hurtubia González

UrbanSim is an integrated transportation land-use model that has been under development since the late 1990s. It has received a significant amount of attention in the integrated modeling community. It is well known for its disaggregated approach. A number ...

2008

A heuristic for nonlinear global optimization

Nicolas Zufferey, Michel Bierlaire, Michaël Clément Louis Ghislain Thémans

We propose a new heuristic for nonlinear global optimization combining a variable neighbourhood search framework with a modified trust-region algorithm as local search. The proposed method presents the capability to prematurely interrupt the local search i ...

2008

Route choice modeling with network-free data

Michel Bierlaire, Emma Frejinger

Route choice models are difficult to design and to estimate for various reasons. In this paper we focus on issues related to data. Indeed, real data in its original format are not related to the network used by the modeler and do therefore not correspond t ...

2008

The estimation of Generalized Extreme Value models from choice-based samples

Michel Bierlaire

In the presence of choice-based sampling strategies for data collection, the property of Multinomial Logit (MNL) models, that consistent estimâtes of all parameters but the constants can be obtained from an Exogenous Sample Maximum Likelihood (ESML) estima ...

2008

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

Income and distance elasticities of values of travel time savings: new Swiss results

Michel Bierlaire

This paper presents the findings of a study looking into the valuation of travel time savings (VTTS) in Switzerland, across modes as well as across purpose groups. The study makes several departures from the usual practice in VTTS studies, with the main on ...

2008

A Master-Slave Approach for Object Detection and Matching with Fixed and Mobile Cameras

Murat Kunt, Michel Bierlaire, Alexandre Massoud Alahi

Typical object detection algorithms on mobile cameras suffer from the lack of a-priori knowledge on the object to be detected. The variability in the shape, pose, color distribution, and behavior affect the robustness of the detection process. In general, ...

2008

A heuristic for nonlinear global optimization

Nicolas Zufferey, Michel Bierlaire, Michaël Clément Louis Ghislain Thémans

We propose a new heuristic for nonlinear global optimization combining a variable neighborhood search framework with a modified trust-region algorithm as local search. The proposed method presents the capability to prematurely interrupt the local search if ...

2008

A doped derivative-free algorithm

Rodrigue Oeuvray, Michel Bierlaire

2008

Capturing correlation with subnetworks in route choice models

Michel Bierlaire, Emma Frejinger

When using random utility models for a route choice problem, a critical issue is the significant correlation among alternatives. There are basically two types of models proposed in the literature to address it: (i) a deterministic correction of the path ut ...

2007

A new derivative-free algorithm for the medical image registration problem

Rodrigue Oeuvray, Michel Bierlaire

The medical image registration problem can be formulated as a nonlinear programming problem. To identify appropriate algorithms to solve it, it is critical to analyze the properties of the problem. In this paper, we consider the image registration problem ...

2007

A multi-iterate method to solve systems of nonlinear equations

Frank Crittin, Michel Bierlaire, Michaël Clément Louis Ghislain Thémans

We propose an extension of secant methods for nonlinear equations using a population of previous iterates. Contrarily to classical secant methods, where exact interpolation is used, we prefer a least squares approach to calibrate the linear model. We propo ...

2007

Modeling Learning in Route Choice

Michel Bierlaire

National Academy of Sciences2007

Discrete choice models with multiplicative error terms

Michel Bierlaire

The conditional indirect utility of many random utility maximization (RUM) discrete choice models is specified as a sum of an index V depending on observables and an independent random term P. In general, the universe of RUM consistent models is much large ...

2007

A practical test for the choice of mixing distribution in discrete choice models

Michel Bierlaire

The choice of a specific distribution for random parameters of discrete choice models is a critical issue in transportation analysis. Indeed, various pieces of research have demonstrated that an inappropriate choice of the distribution may lead to serious ...

2007

A systematic comparison of continuous and discrete mixture models

Michel Bierlaire

2007

Normalization and correlation of cross-nested logit models

Michel Bierlaire, Emmanuel Abbé

We address two fundamental issues associated with the use of cross-nested logit models. On the one hand, we justify the adequate normalization of the model proposed by Wen and Koppelman (2001). On the other hand, we provide an analysis of the correlation s ...

2007

A General and Operational Representation of Generalised Extreme Value Models

Michel Bierlaire

Generalised extreme value models provide an interesting theoretical framework to develop closed-form random utility models. Unfortunately, few instances of this family are to be found as operational models in practice. The form of the model, based on a gen ...

2006

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