Comparison Between Genetic Algorithms and the Baum-Welch Algorithm in Learning HMMs for Human Activity Classification

Authors:
Óscar Pérez;Massimo Piccardi;Jesús García;Miguel Ángel Patricio;José Manuel Molina
Affiliations:
Faculty of Information Technology, University of Technology, Sydney, and Computer Science Department-GIAA, Universidad Carlos III de Madrid, Colmenarejo, Spain;Faculty of Information Technology, University of Technology, Sydney,;Computer Science Department-GIAA, Universidad Carlos III de Madrid, Colmenarejo, Spain;Computer Science Department-GIAA, Universidad Carlos III de Madrid, Colmenarejo, Spain;Computer Science Department-GIAA, Universidad Carlos III de Madrid, Colmenarejo, Spain
Venue:
Proceedings of the 2007 EvoWorkshops 2007 on EvoCoMnet, EvoFIN, EvoIASP,EvoINTERACTION, EvoMUSART, EvoSTOC and EvoTransLog: Applications of Evolutionary Computing
Year:
2009

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Abstract

A Hidden Markov Model (HMM) is used as an efficient and robust technique for human activities classification. The HMM evaluates a set of video recordings to classify each scene as a function of the future, actual and previous scenes. The probabilities of transition between states of the HMM and the observation model should be adjusted in order to obtain a correct classification. In this work, these matrixes are estimated using the well known Baum-Welch algorithm that is based on the definition of the real observations as a mixture of two Gaussians for each state. The application of the GA follows the same principle but the optimization is carried out considering the classification. In this case, GA optimizes the Gaussian parameters considering as a fitness function the results of the classification application. Results show the improvement of GA techniques for human activities recognition.