Fundamentals of speech recognition
Fundamentals of speech recognition
Dual hidden Markov model for characterizing wavelet coefficients from multi-aspect scattering data
Signal Processing - Special section on information theoretic aspects of digital watermarking
Pattern Classification (2nd Edition)
Pattern Classification (2nd Edition)
Real-time detection of steam in video images
Pattern Recognition
A new look at discriminative training for hidden Markov models
Pattern Recognition Letters
New signal decomposition method based speech enhancement
Signal Processing
IIH-MSP '07 Proceedings of the Third International Conference on International Information Hiding and Multimedia Signal Processing (IIH-MSP 2007) - Volume 01
Multiscale fusion of wavelet-domain hidden Markov tree through graph cut
Image and Vision Computing
Boundary refinements for wavelet-domain multiscale texture segmentation
Image and Vision Computing
Discriminative training of HMMs for automatic speech recognition: A survey
Computer Speech and Language
An EM algorithm to learn sequences in the wavelet domain
MICAI'07 Proceedings of the artificial intelligence 6th Mexican international conference on Advances in artificial intelligence
Wavelet-based statistical signal processing using hidden Markovmodels
IEEE Transactions on Signal Processing
Computational methods for hidden Markov tree models-an application to wavelet trees
IEEE Transactions on Signal Processing
Improved hidden Markov models in the wavelet-domain
IEEE Transactions on Signal Processing
Discriminative Training for Large-Vocabulary Speech Recognition Using Minimum Classification Error
IEEE Transactions on Audio, Speech, and Language Processing
IEEE Transactions on Audio, Speech, and Language Processing
Directional multiscale modeling of images using the contourlet transform
IEEE Transactions on Image Processing
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Wavelet analysis has found widespread use in signal processing and many classification tasks. Nevertheless, its use in dynamic pattern recognition have been much more restricted since most of wavelet models cannot handle variable length sequences properly. Recently, composite hidden Markov models which observe structured data in the wavelet domain were proposed to deal with this kind of sequences. In these models, hidden Markov trees account for local dynamics in a multiresolution framework, while standard hidden Markov models capture longer correlations in time. Despite these models have shown promising results in simple applications, only generative approaches have been used so far for parameter estimation. The goal of this work is to take a step forward in the development of dynamic pattern recognizers using wavelet features by introducing a new discriminative training method for this Markov models. The learning strategy relies on the minimum classification error approach and provides re-estimation formulas for fully non-tied models. Numerical experiments on phoneme recognition show important improvement over the recognition rate achieved by the same models trained using maximum likelihood estimation.