一个基于全景图的虚拟环境漫游系统

An Image－Based Virtual Environment Navigation System

虚拟现实的实现有两种方法。传统上，使用三维图形学方法进行建模和绘制，这种方法需要繁琐的建模工作和昂贵的专用绘图硬件，而且用三维模型很难真实表现自然景观。基于图像的绘制是实现虚拟现实系统的一种新方法，它克服了三维图形方法的上述缺点，近年来得到了日益广泛的应用。文章讨论了一个基于图像的虚拟环境漫游系统的实现，分析了此类系统的模型，介绍了系统实现中摄像机定标、图像拼接、实时图像变换等关键技术。

： There are two approaches to the implementation of virtual reality system．Traditionally，virtual reality systems establish the 3D geometry model of virtual environment and render it in real－time．This approach usually requires laborious modeling procedure and expensive rendering hardware，and even worse，it is difficult to establish the 3D geometry model of natural scenes．As a new technology to resolve all these problems，Image－based rendering technology has been widely used in recent years．In this paper，the implementation of an image－based virtual environment navigation system is discussed，the architecture and model of this kind of systems are analyzed，and the key technologies，such as camera calibrating，image mosaic，real－time warping，are presented．