臉部表情動畫－－以藝術表現控制為主的研究論述

Facial Animation: A Survey - Based on Artistic Expression Control

逼真的人臉模型及臉部表情長久以來都是電腦動畫令人困擾的問題。然而，因為是表現角色人物內部感情世界的最主要管道，臉部表情動畫多年以來一直是電腦動畫研究的焦點。本篇論文研究探討電腦動畫角色人物臉部表情動畫的各種作法，並針對已發表的學術論文中各項臉部表情動畫製作方法簡述歸類，探討分析各類作法其優、缺點及相關的表現。本文首先闡述電腦動畫角色臉部表情製作的困難與現狀，繼而探討各類動畫模擬方法，並特別以“藝術表現性”評估分析各作法。最後總結表情動畫的作法與臉部表情動畫的藝術表現作為結論。

Creating realistic human face models and facial animations has been a persistent problem in Computer Animation. However, being the utmost channel in reflecting the character's emotion, facial animation has drawn researchers' interest for years. This paper surveys the animation techniques developed in Computer Graphics for facial animation. It summarizes the theoretical approaches used in published work and describes their strengths, weaknesses, and relative performance. First, the problems and current status of facial animation are described. Then, we review a variety of geometric, image, performance-driven techniques of facial animation. Artistic expression control is especially emphasized in evaluating each method. Finally, summary of these facial computational models in achieving artistic expression are also offered as the conclusions.