【摘要】 人脸是人类相互交流的重要渠道,是人类的喜、怒、哀、乐等复杂表情和语言的载体。因此,具有真实感的三维人脸模型的构造和变形是计算机图形学领域中一个研究热点。如何在三维人脸模型上产生具有真实感的人脸表情和动作,是其中的一个难点。文中介绍了一种基于Delaunay和Dirichlet/Voronoi图的Dirichlet自由变形算法(Dirichlet Free-Form De-formations,简称DFFD)解决这一问题。文中详细介绍了DFFD技术,并根据MPEG-4的脸部定义参数,应用DFFD对一般人脸进行变形。同时提出了在进行人脸变形时利用脸部定义参数FDP与脸部动画参数FAP分层次控制的方法,这种两级控制点控制的设置,使三维人脸模型产生光滑变形,由此可将人脸各种表情平滑准确地展现出来。更多还原

【Abstract】 The human face is the important channel which the humanity exchanges mutually.It is the complex expression and the language carrier of humanity happiness,the anger,the sorrow,and so on.Therefore,construction and animation of realistic human facial models is an important research field in the computer graphics.How to produce facial expression of person with sense of reality and movement on three-dimensional facial models of people,it is a difficult point of one of them.So introduced one kind of algorithm based on Delaunay and Dirichlet/ Voronoi diagrams that is Dirichlet free-form deformations algorithm(DFFD) solve this problem.Introduced DFFD technology in the article in detail,according to MPEG-4’s face definition parameters,emploied DFFD carry on to common people deformations.Put forward while carrying on the faces of people out of shape utilizing face definition parameter FDP and facial animation parameter method that FAP control by different level at the same time.The establishment controlled in this kind of control point of two grades,make three-dimensional facial models of people have the smooth deformations,therefore it can show various expressions of faces of people smoothly and accurately.更多还原