%0 Journal Article 
%F Kervrann98a
%A Kervrann, C.
%A Davoine, F.
%A Pérez, P.
%A Li, H.
%A Forcheimer, R.
%A Labit, C.
%T Generalized likelihood ratio-based face detection and extraction of mouth features
%J Pattern Recognition Letters
%V 18
%N 9
%P 899-912
%X We describe a system to detect the speaker's face and mouth in videophone sequences. A statistical scheme based on a subspace method is described for detecting and tracking faces under varying poses. A matching criterion based on a Generalized Likelihood Ratio is optimized efficiently with respect to a perspective transformation using a coarse-to-fine search strategy combined with a simulated annealing algorithm. Moreover, we analyze the amplitude projections around the speaker's mouth to describe the shape of the lips. All computations are performed on lossy H263-coded images. The proposed algorithms are well-suited to a further real-time implementation
%U http://www.irisa.fr/vista/Papers/1997_prl_kervrann.pdf
%D 1998