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Using Hidden Markov Models and Dynamic Size Functions for Gesture Recognition

Andrea Sorrentino Fabio Cuzzolin Ruggero Frezza
UniversitÓ di Padova
Via Gradenigo 6/a, 35131 Padova


Automatic gesture recognition is an important and challenging problem in comupter vision. In this paper we present an original technique for hand gesture recognition based on a dynamic shape representation by combining size functions and hidden Markov models (HMM). Size functions are objects of topological nature which allow to describe shape with completeness and a remarkable tolerance to noise. HMM allow, instead, for the inclusion of dynamics in the model. Each gesture is described by a different probabilistic finite state machine which models a succession of so called canonical postures of the hand. The state dynamics describe the transition between canonical postures while the observation equations are maps from the set of canonical postures to size functions. Tests on real image sequences are included.

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Adrian F Clark
Mon Jul 28 12:54:58 BST 1997