基于物理模型的特定人脸模型与表情动画模型

Specific Face Model and Expression Animation Model Based on Physical Model

人脸造型与人脸表情动画的研究是计算机图形学领域中的一项热门课题，其模型的建立是构建人脸表情虚拟系统的一个重要基础，该系统可广泛地应用于虚拟环境、可视电话、远程教育等系统中。本文根据人脸生理结构的特点，先将人脸表面分成若干块，进而运用弹性形变原理，分析了脸部各块的形变规律，提出了一种将一般人脸模型变换为特定人脸模型的变形模型，而后又以眼睛为例，分析了“眨眼睛”的物理运动规律，为其建立了表情动画模型。在此基础上我们开发了一个实际的人脸造型与表情动画系统，运用该系统生成的特定人脸及表情动画自然、真实，结果令人满意。

Research on human face modeling and the facial expression animation is a hot topic in computer graphics and it is also the basis of building a virtual facial expression animation system. It can be widely used in virtual environment, visual telephone, long distance education system etc. According to the features of the human face we first divide the surface of a human face into some blocks and analyze the morphable rules for each block. And then, on the basis of it we put forward a new method to transform a general face model to a specific face model in this paper. At last we take human eyes as an example, analyze the motion rules of nictitating and set up its animation model. All these methods have been used in a real human face expression animation system developed by us. And the resulting face animation is surprisingly life-like and looks very much like the original live performance.