【作者】 李嵘；

【导师】 杨宗凯； 赵刚；

【作者基本信息】 华中师范大学 ， 计算机应用技术， 2008， 硕士

【摘要】 虚拟摄影棚是目前多媒体技术及数字化技术的研究热点,本文基于武汉市科技攻关项目低成本虚拟摄影棚平台系统,为其提供场景匹配的功能,是虚拟摄影棚系统中非常重要的部分。本文研究了虚拟摄影棚的关键技术之一的场景匹配技术,将场景匹配分为二维场景匹配及准三维场景匹配两部分,以桌面控制的方式对摄像机及虚拟场景进行匹配控制。在具体的匹配算法方面,二维场景的匹配算法由人眼视觉特性及摄像机成像原理,推导出二维匹配的速度公式,再根据实际实现细节完成。准三维场景匹配通过在二维对摄像机成像原理分析的基础上,对三维图形学进行研究,实现准三维场景匹配算法的设计。三维场景通过对Multigen vega软件编程进行场景控制,而Vega控制程序与主程序之间采用进程通信的方式进行信息交换。在二维和准三维匹配中,都加入了惯性模拟,以使匹配效果更具真实感。实验结果表明,本文所使用的二维及准三维匹配算法已达到了最初的设计标准,具有较好的效果,但是准三维系统与真三维系统还有一定的区别,如其摄像机的位置不能改变,不能实现真正的三维漫游等,此外,本文的匹配精确度方面还有待完善,这也将是下一步的研究目标。本虚拟摄影棚二维及准三维场景匹配功能的实现,为虚拟摄影棚研究领域开创了一条低价高效的发展道路,大大推进了虚拟摄影棚的普及化,对电视节目制作的快速发展具有很大的促进作用。更多还原

【Abstract】 Virtual studio is currently a hot subject of research on multi-media technology and digital technology. This thesis based on the project of Low Cost Virtual Studio Platform (Wuhan Science and Technology Research Project), providing the scene matching function for it, and it is a very important part of the virtual studio system.This thesis researched on scene matching, which is one of the key technologies of virtual studio. We divided scene matching into two parts, one is 2D and the other is quasi-3D. The camera and the virtual scene are both controlled by desktop software.2D scene matching arithmetic use the speed formula proved by human visual properties and the theory of camera imaging, and modified by detail in practice. Quasi-3D arithmetic is based on the theory of camera imaging studied in 2D, and 3D Graphics. The 3D scene is controlled by Multigen Vega, who exchanged information by process communication. The inertia simulation is added to both 2D and quasi-3D scene matching to make the effect more realistic.It is indicated by the result of experiments that, the 2D and quasi-3D arithmetic used in this thesis both reached aim, and have good effect. But quasi-3D system has many differences with real 3D system, such as the cameras in quasi-3D are fixed, they can’t move. The next target is to complete the 3D roam and shelter, and perfect the precision.The realization of 2D and quasi-3D scene matching started a low-cost and high-effect road for the research of virtual studio. It speeded up the popularization of virtual studio and the development of television.更多还原