title: Topological mappings of video and audio data.
abstract: We review a new form of self-organizing map which is based on a nonlinear projection of latent points into data space, identical to that performed in the Generative Topographic Mapping (GTM).(1) But whereas the GTM is an extension of a mixture of experts, this model is an extension of a product of experts.(2) We show visualisation and clustering results on a data set composed of video data of lips uttering 5 Korean vowels. Finally we note that we may dispense with the probabilistic underpinnings of the product of experts and derive the same algorithm as a minimisation of mean squared error between the prototypes and the data. This leads us to suggest a new algorithm which incorporates local and global information in the clustering. Both ot the new algorithms achieve better results than the standard Self-Organizing Map.
authors.affiliation: Applied Computational Intelligence Research Unit, The University of The West of Scotland, UK. colin.fyfe@uws.ac.uk
authors.forename: Colin
authors.initials: C
authors.lastname: Fyfe
authors.forename: Wesam
authors.initials: W
authors.lastname: Barbakh
authors.forename: Wei Chuan
authors.initials: WC
authors.lastname: Ooi
authors.forename: Hanseok
authors.initials: H
authors.lastname: Ko
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D016000:Cluster Analysis; D016208:Databases, Factual; D006801:Humans; D008046:Lip; D017711:Nonlinear Dynamics; D014741:Video Recording; D014831:Voice