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Model structure selection & training algorithms for an HMM gesture recognition system

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4 Author(s)
Nianjun Liu ; Intelligent Real-Time Imaging & Sensing Group, Queensland Univ., Brisbane, Qld., Australia ; Lovell, B.C. ; Kootsookos, P.J. ; Davis, R.I.A.

Hidden Markov models using the fully-connected, left-right and left-right banded model structures are applied to the problem of alphabetical letter gesture recognition. We examine the effect of training techniques, in particular the Baum-Welch and Viterbi path counting techniques, on each of the model structures. We show that recognition rates improve when moving from a fully-connected model to a left-right model and a left-right banded 'staircase' model with peak recognition rates of 84.8%, 92.31% and 97.31% respectively. The left-right banded model in conjunction with the Viterbi path counting present the best performance. Direct calculation of model parameters from analysis of the physical system was also tested, yielding a peak recognition rate of 92%, but the simplicity and efficiency of this approach is of interest.

Published in:

Frontiers in Handwriting Recognition, 2004. IWFHR-9 2004. Ninth International Workshop on

Date of Conference:

26-29 Oct. 2004