Mouth center detection under active near infrared illumination

Authors:
Thorsten Gernoth;Ralph Kricke;Rolf-Rainer Grigat
Affiliations:
Hamburg University of Technology, Vision Systems, E-2, Hamburg, Germany;Hamburg University of Technology, Vision Systems, E-2, Hamburg, Germany;Hamburg University of Technology, Vision Systems, E-2, Hamburg, Germany
Venue:
SIP'07 Proceedings of the 6th Conference on 6th WSEAS International Conference on Signal Processing - Volume 6
Year:
2007

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Abstract

Mouth center detection is important for speech and speaker recognition based on lip movements. In this paper we present an algorithm for mouth center detection under active near infrared illumination. Face images captured in the near infrared spectrum are normalized with respect to size and in-plane rotation of the eyes. A coarse image region containing the mouth can be determined in the normalized images. We present an approach for locating the center of the mouth using morphological operations and amplitude projection of the mouth region. Experimental results demonstrate the effectiveness of the presented mouth center detection algorithm under simulated realistic conditions.