... aV,min and aV,max, respectively. The search lines S1 and S2for b and c areon the height of the mouth middle point and parallel to theW axis. They are bounded by −bW,max, −bW,min and bW,min,bW,max, ... VisualCommunications and Image Processing, vol. 2904, pp. 1516–1527, Boston, Mass, USA, November 1993.[7] A. Samal and P. Iyengar, “Automatic recognition and analy-sis of human faces and facial expressions: ... Cir-cuits and Systems for Video Technology, vol. 12, no. 3, pp. 183–192, 2002.[6] M. J. T. Reinders, F. A. Odijk, J. C. A. van der Lubbe, and J. J.Gerbrands, “Tracking of global motion and facial...