Under some circumstances, such as in very noisy environments, it could be useful to use not only the acoustic evidence of the speech, but also visual evidence by recording the movement of the lips and processing both evidences together. This processing of audio and visual speech is commonly referred to as audio-visual speech processing.
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(2009). Audio-Visual Speech Processing. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_483
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DOI: https://doi.org/10.1007/978-0-387-73003-5_483
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