具有真实感的虚拟人头部的一种构造方法

在人类交流信息、情感和动机暗示的广泛能力之中，面部是其中最关键的组成部分之一．因此，具有真实感的三维人脸模型的构造和动画是计算机图形学领域中一个重要的的研究课题．如何能够便捷有效的构造出具有真实感的三维人头部模型是其中一个难点．本文介绍了一种三维人头部模型的构造方法．该构造方法基于一个已存在的三维头部的无个体特征的一般模型，该模型可以经过调整而创造出具有个性特征的头部模型；借助于从两张从正交角度拍摄的普通的某个人的二维照片上采集到的能够反映该个体特征的数据参考点作为控制点，通过DFFD(Dirichlet Free-Form Deformation)的自由变形方法，调整该三维头部模型，进行非线性变形，向特征人面部结构逼近，从而构造出具有个性化特征的头部模型．在此基础上，本文提出了对该方法的一种改进，即对用来进行控制非线性变形的参考点赋以不同的权值，进行分层次控制，从而使得三维头部模型能够更精确的再现个体特征．

A construction method of realistic virtual human's head

The face is one of the most vital components in the vast ability of humans to communicate information as well as emotional and motivational cues. Construction and animation of realistic human facial models are an important research field in computer graphics. How to construct a realistic 3D human head model fast and efficiently is still a challenge. The method to construct a realistic human head presented in this paper is: an 3D head-model was first created to serve as a generic model, which can be modified to create another head-model. The individualized head-model is then created by modifying this first head-model with the aid of the orthogonal normal 2D-images of a person, by means of a certain non-linear deformation-Dirichlet Free-Form Deformation. We improve this method by giving different reference points and different priviledge values which are used to control the deformation. Then, we can get a more precise result.