Um arcabouço para seleção e fusão de classificadores de padrão

Author(s)

Fabio Augusto Faria

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Computação
• Defense date: 2014-07-03

Examining board members

Ricardo da Silva Torres; William Robson Schwartz; Renata Galante; Hélio Pedrini; Leticia Rittner

• Advisor: Anderson de Rezende Rocha; Ricardo da Silva Torres

Abstract

The frequent growth of visual data, either by countless available monitoring video cameras or the popularization of mobile devices that allow each person to create, edit, and share their own images and videos have contributed enormously to the so called ''big-data revolution''. This shear amount of visual data gives rise to a Pandora box of new visual classification problems never imagined before. Image and video classification tasks have been inserted in different and complex applications and the use of machine learning-based solutions has become the most popular approach to several applications. Notwithstanding, there is no silver bullet that solves all the problems, i.e., it is not possible to characterize all images of different domains with the same description method nor is it possible to use the same learning method to achieve good results in any kind of application. In this thesis, we aim at proposing a framework for classifier selection and fusion. Our method seeks to combine image characterization and learning methods by means of a meta-learning approach responsible for assessing which methods contribute more towards the solution of a given problem. The framework uses three different strategies of classifier selection which pinpoints the less correlated, yet effective, classifiers through a series of diversity measure analysis. The experiments show that the proposed approaches yield comparable results to well-known algorithms from the literature on many different applications but using less learning and description methods as well as not incurring in the curse of dimensionality and normalization problems common to some fusion techniques. Furthermore, our approach is able to achieve effective classification results using very reduced training sets (AU)

• FAPESP's process: 10/14910-0 - Evidence-Fusion Methods for Multimedia Retrieval and Classification
• Grantee: Fabio Augusto Faria
• Support Opportunities: Scholarships in Brazil - Doctorate