脸部表情动画的实现

Implementation of facial expression animation

用计算机动画技术合成人的面部表情动画是人体动画研究的一个重点。本文分析了人脸的生理结构组成和脸部表情与表情单元形变之间的关系，研究了包括局部变形箱变形、线性局部变形和密度球收缩和舒张变形在内的三种面部肌肉变形方法，在此基础上，提出了一个基于复合多组局部变形操作的脸部表情动画的模拟算法。通过调相关整表情单元的形变因子一时间参数曲线，有效地控制了脸部表情的动画过程，从而实现了脸部表情动画。

The synthesis of facial expression of human beings with computer animation technology is a key point of the research of human body animation.In this paper,the biological structure of human face and relationship between facial expression and deformation of expression units are analyzed .Three computer analogue deformation algorithms ( including Free Form Dedeformation,Linear Local Deformation and Density Sphere Deformation)of facial muscles are researched and an algorithm of Facial Expression Animation based on multiple group local deformation is presented.Then the facial expression animation is effectively implemented by adjusting a factor time parameter function relating to specific acotor unit(AU).