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Audio Visual Speech Recognition

Grammar. Dictionary. Decoder. Features extraction. Acoustic models. Audio Visual Speech Recognition. Audio processing. Features extraction Digits detection Digits recognition: Acoustic parameters : MFCC Context independent HMMs Decoding : Time synchronous algorithm

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Audio Visual Speech Recognition

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  1. Grammar Dictionary Decoder Features extraction Acoustic models Audio Visual Speech Recognition Projet de recherche sur crédit incitatif GET 2005

  2. Audio processing • Features extraction • Digits detection • Digits recognition: • Acoustic parameters : MFCC • Context independent HMMs • Decoding : Time synchronous algorithm • Sound effect • Noise : Babble • Recognition experiments Projet de recherche sur crédit incitatif GET 2005

  3. Video processing • Video extraction • Lips localisation • Images interpolation (same frequency as speech) • Features extraction • DCT and DCT2 (DCT+LDA) • Projections : PRO et PRO2 (PRO+LDA) • Recognition experiments Projet de recherche sur crédit incitatif GET 2005

  4. Fusion techniques • Parameters fusion : • Concatenation • Dimension decrease : Linear Discriminant Analysis (LDA) • Modelisation : classical HMM with one stream • Scores fusion : Multi-stream HMM Projet de recherche sur crédit incitatif GET 2005

  5. Experimental results :parameters fusion Projet de recherche sur crédit incitatif GET 2005

  6. Experimental results : Scores fusion at -5db Projet de recherche sur crédit incitatif GET 2005

  7. Bibliography • G. Potamianos, C. Neti, G. Gravier, A. Garp, A. W. Senior,  « Recent Advances in the Automatic Recognition of Audiovisuel Speech ». In proceedings of IEEE Vol. 91, pages 1306-1326. sept 2003. • J.N. Gowdy, A. Subramanya, C. Bartels, and J. Bilmes, « DBN-Based Multi-Stream Models for Audio-Visual Speech Recognition ». IEEE Int. Conf. on Acoustics, Speech, and Signal Processing, May 2004. Montreal, Canada • F. Brugger, L. Zouari, H. Bredin, A. Ameheaye, G. Chollet, D. Pastor et Y. Ni, « Reconnaissance de la parole audiovisuelle par VMike ». XVIèmes Journées d’Etude sur la Parole JEP. Dinard 2006. Projet de recherche sur crédit incitatif GET 2005

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