图像和建模相结合的虚拟场景绘制技术研究

虚拟现实的基础和核心是虚拟场景的构造与交互操纵。有两种方法实现基于微机的虚拟场景：图像的方法(Image-Based Method：IBM)和建模的方法(Model-Based Method：MBM)，这两种方法各有其优缺点。基于图像的方法虽然逼真性和实时性都很好，但只能实时浏览，而不能实时操纵；基于建模的方法虽然支持实时操纵，但其真实感较差。文中在分别研究基于图像、基于建模虚拟现实理论与实现方法的基础上，充分发挥基于图像方法和基于建模方法各自的优点，实现了图像与建模方法相结合的虚拟场景系统。文中介绍了系统的结构、功能、典型实例以及若干关键技术。

Research on Construction and Real-time Rendering of Virtual Environment Combining Image-based and Model-based Method

The kernel and foundation of virtual reality is the construction of virtual environment and to handle the environment friendly. There are two methods to implement a PC-based virtual environment: the image-based method (IBM) and the model-based method (MBM). Both of them have their advantages and disadvantages: although IBM has good realistic and good real-time capability, a virtual environment built by IBM can not be manipulated. MBM method supports real-time manipulation, however, it faces some difficulties such as realistic, etc. Taking the advantages of IBM and MBM, a virtual environment construction and real-time graphics generation system that supports photographs and geometric modeling is developed on microcomputer. The structure, functions, typical examples and some key technical details of the system are presented.