- Research Article
- Published:
Audio-Visual Speech Recognition Using MPEG-4 Compliant Visual Features
EURASIP Journal on Advances in Signal Processing volume 2002, Article number: 150948 (2002)
Abstract
We describe an audio-visual automatic continuous speech recognition system, which significantly improves speech recognition performance over a wide range of acoustic noise levels, as well as under clean audio conditions. The system utilizes facial animation parameters (FAPs) supported by the MPEG-4 standard for the visual representation of speech. We also describe a robust and automatic algorithm we have developed to extract FAPs from visual data, which does not require hand labeling or extensive training procedures. The principal component analysis (PCA) was performed on the FAPs in order to decrease the dimensionality of the visual feature vectors, and the derived projection weights were used as visual features in the audio-visual automatic speech recognition (ASR) experiments. Both single-stream and multistream hidden Markov models (HMMs) were used to model the ASR system, integrate audio and visual information, and perform a relatively large vocabulary (approximately 1000 words) speech recognition experiments. The experiments performed use clean audio data and audio data corrupted by stationary white Gaussian noise at various SNRs. The proposed system reduces the word error rate (WER) by 20% to 23% relatively to audio-only speech recognition WERs, at various SNRs (0–30 dB) with additive white Gaussian noise, and by 19% relatively to audio-only speech recognition WER under clean audio conditions.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Aleksic, P.S., Williams, J.J., Wu, Z. et al. Audio-Visual Speech Recognition Using MPEG-4 Compliant Visual Features. EURASIP J. Adv. Signal Process. 2002, 150948 (2002). https://doi.org/10.1155/S1110865702206162
Received:
Revised:
Published:
DOI: https://doi.org/10.1155/S1110865702206162