【作者】 孙武峰；

【导师】 周明全；

【作者基本信息】 西北大学 ， 计算机应用技术， 2010， 硕士

【摘要】 真实感三维人脸重建技术是计算机图形学领域研究的热点。本文针对基于网格模型的人脸真实感重建方法,分析了面部三维网格简化方法及局部器官特征的定位、人眼模型及运动控制和头发生成等关键技术,实现了基于网格模型的三维人脸真实感建模系统,具有重要的理论意义和实际应用价值。主要研究工作如下：(1)采用基于折叠的网格简化算法简化复原的头部模型,达到了减少网格顶点和三角形面片的目的。应用基于模板的器官匹配法,实现了眼睛区域的快速定位。(2)提出了一种改进的基于球体运动的真实感眼睛模拟方法,分别将人眼眼球和眼皮用球体和抛物线近似,其运动通过眼球和眼皮上的特征点控制,实现了三维人眼的建模和运动的控制。(3)提出了一种基于广义圆柱体的头发股生成算法,将头皮划分为若干个小正方形,分别以每个正方形的中心为头发股生长点构造广义圆柱体,使用该圆柱体逐个地对头发股进行模拟,从而生成逼真的头发模型。(4)提出了一种改进的基于NURBS曲面的整体头发生成算法,该算法采用NURBS参数曲面模拟整体头发,通过曲面上的特征点控制发型,使用alpha映射完成渲染,实现了具有真实感的三维头发快速生成。(5)结合真实感处理的实际需要,以Visual C++6.0和OpenGL为工具,设计并实现了三维人脸眼睛头发真实感建模系统,并验证实现了本文所涉及的相关真实感处理算法。更多还原

【Abstract】 Realistic 3D face reconstruction is a hotspot in the field of computer graphics. In this paper, it included 3D mesh simplification and local organ characteristics position on the craniofacial face, eye model and the motion of eye and hair generation in the realistic face modeling system based on grid model. These has been important theoretical and practical value.The main process:(1) In order to reduce the number of mesh vertices and triangle surfaces, we may handle with head models in mesh simplification based on fold. It will fastly position the eye area in organ matching based on template.(2) A method of realistic eye simulation based on ball movement. It will respectively replace human eyes and eyelids with ball and parabola. Its movement was controlled by feature points on their models. To complete 3D eye modeling and movement controlling.(3) A algorithm of hair strand generation based on generalized cylinder is proposed. The scale is divided into several small squares, It will chose the growth points which was considered as hair root in the center of each small square. The generalized cylinder will complete the simulation of hair strand one by one to generate realistic hair model.(4) A modified algorithm of overall hair generation based on NURBS is proposed. It will simulate overall hair in NURBS parametric surface and control hair style by feature points on the surface. At last, the final rendering was completed by using the alpha map. After these steps, it will quickly generate realistic 3D hair.(5) Combined with the practical needs of realistic face reality, we develop 3D realistic face, eyes and hair modeling system by Visual C++6.0 and open source 3D graphics library for the virtual operation. This research is supported by National Natural Science Foundation of China(60736008).更多还原