Lip protrusion measurement based on facial skeleton data
PAN Xiaosheng1, ZHANG Menghan2, Liew Wee Chung3
1. The College of Information, Mechenical and Electrical Engineering, Shanghai Normal University, Shanghai 200234, China;
2. School of Life Sciences, Fudan University, Shanghai 200438, China;
3. School of Information and Communication Technology, Griffith University, Queensland, Australia
Abstract：The paper presents a method to measure lip protrusion. The upper and low lip movement patterns differ, so the lip protrusion is defined for the upper or lower lips as the Euclidean distance between the lip edge and the incisor. Three-dimensional lip coordinates were obtained by observing the trajectories of reference markers on human faces. The singular value decomposition (SVD) method was used to eliminate the head rigid-body movement and mouth opening movement. Then, the coordinates for the upper and lower incisors were obtained by calculating the coordinates of the reference markers pasted on the facial bony structure. Finally, lip edge coordinates were introduced to calculate the lip protrusion. The method gives good results with three-dimensional lip data and is also applicable for analyzing two-dimensional lip data.
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