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Journal of Speech, Language, and Hearing Research Vol.41 564-575 June 1998.
© American Speech-Language-Hearing Association
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Selective Visual Masking in Speechreading

Jill E. Preminger 1
Hwei-Bing Lin 2
Michel Payen 2

Harry Levitt 2
1 Department of Special Education and Individualized Services Kean University Union, NJ
2 Center for Research in Speech and Hearing Sciences Graduate School City University of New York

jpreminger{at}mci2000.com

Using digital video technology, selective aspects of a face can be masked by identifying the pixels that represent it and then, by adjusting the gray levels, effectively eliminate that facial aspect. In groups of young adults with normal vision and hearing, consonant-viseme recognition was measured for closed sets of vowel-consonant-vowel disyllables. In the first experiment viseme recognition was measured while the tongue and teeth were masked and while the entire mouth was masked. The results showed that masking of the tongue and teeth had little effect on viseme recognition, and when the entire mouth was masked, participants continued to identify consonant visemes with 70% or greater accuracy in the /a/ and // vowel contexts. In the second experiment, viseme recognition was measured when the upper part of the face and the mouth were masked and when the lower part of the face and the mouth were masked. The results showed that when the mouth and the upper part of the face were masked, performance was poor, but information was available to identify the consonantviseme /f/. When the mouth and the lower part of the face were masked, viseme recognition was quite poor, but information was available to discriminate the consonant-viseme /p/ from other consonant visemes.

KEY WORDS: speechreading, lipreading, visual masking, viseme recognition

Submitted on June 2, 1997
Accepted on February 5, 1998


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