Pattern Analysis and Applications

, Volume 17, Issue 3, pp 611–621

Visual-speech-pass filtering for robust automatic lip-reading

Theoretical Advances

Abstract

This paper proposes a temporal filtering technique used in extraction of visual features for improved robustness of automatic lip-reading, called visual-speech-pass filtering. A band-pass filter is applied to the pixel value sequence of the images containing the speaker’s lip region to remove unwanted variations that are not relevant to the speech information. The filter is carefully designed based on psychological, spectral, and experimental analyses. Experimental results on two speaker-independent and one speaker-dependent recognition tasks demonstrate that the proposed technique significantly improves recognition performance in both clean and visually noisy conditions.

Keywords

Automatic lip-reading Visual-speech-pass filtering (VSPF) Feature extraction Temporal filtering Noise-robustness 

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Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  1. 1.School of Integrated TechnologyYonsei UniversitySeoulKorea

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