Novel VQ Designs for Discrete HMM On-Line Handwritten Whiteboard Note Recognition

Authors:
Joachim Schenk;Stefan Schwärzler;Günther Ruske;Gerhard Rigoll
Affiliations:
Institute for Human-Machine Communication, Technische Universität München, Munich, Germany 80290;Institute for Human-Machine Communication, Technische Universität München, Munich, Germany 80290;Institute for Human-Machine Communication, Technische Universität München, Munich, Germany 80290;Institute for Human-Machine Communication, Technische Universität München, Munich, Germany 80290
Venue:
Proceedings of the 30th DAGM symposium on Pattern Recognition
Year:
2008

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Abstract

In this work we propose two novel vector quantization (VQ) designs for discrete HMM-based on-line handwriting recognition of whiteboard notes. Both VQ designs represent the binary pressure information without any loss. The new designs are necessary because standard k-means VQ systems cannot quantize this binary feature adequately, as is shown in this paper.Our experiments show that the new systems provide a relative improvement of r= 1.8 % in recognition accuracy on a character- and r= 3.3 % on a word-level benchmark compared to a standard k-means VQ system. Additionally, our system is compared and proven to be competitive to a state-of-the-art continuous HMM-based system yielding a slight relative improvement of r= 0.6 %.