Fig. 9
From: Inner lips feature extraction based on CLNF with hybrid dynamic template for Cued Speech
The figure is plotted along the middle point of the upper inner lips. Blue curve: original luminance variation. Red curve: the smoothed luminance. Green curve: the smoothed first derivative. Red curve with stars: correlation values between the template and the first derivation curve in function of the position of the template. Magenta curve with stars: the proposed hybrid dynamic template. Vertical black line around the 301 position corresponds to the initial searching position. The bold red line around position 307 located in the maximum correlation value corresponds to the estimated lower outer lips position