An Adaptive Visual Attentive Tracker with HMM-Based TD Learning Capability for Human Intended Behavior

Minh Anh Thi HO  Yoji YAMADA  Yoji UMETANI  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E86-D   No.6   pp.1051-1058
Publication Date: 2003/06/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Artificial Intelligence, Cognitive Science
Keyword: 
visual attention,  human intention,  hidden Markov models,  temporal difference learning,  

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Summary: 
In the study, we build a system called Adaptive Visual Attentive Tracker (AVAT) for the purpose of developing a non-verbal communication channel between the system and an operator who presents intended movements. In the system, we constructed an HMM (Hidden Markov Models)-based TD (Temporal Difference) learning algorithm to track and zoom in on an operator's behavioral sequence which represents his/her intention. AVAT extracts human intended movements from ordinary walking behavior based on the following two algorithms: the first is to model the movements of human body parts using HMMs algorithm, and the second is to learn the model of the tracker's action using a model-based TD learning algorithm. In the paper, we describe the integrated algorithm of the above two methods: whose linkage is established by assigning the state transition probability in HMM as a reward in TD learning. Experimental results of extracting an operator's hand sign action sequence during her natural walking motion are shown which demonstrates the function of AVAT as it is developed within the framework of perceptual organization. Identification of the sign gesture context through wavelet analysis autonomously provides a reward value for optimizing AVAT's action patterns.