HVS:一种基于实景图象的虚拟现实系统

HVS:A VIRTUAL REALITY SYSTEM BASED ON THE REAL_WORLD IMAGE

大多数的虚拟现实系统基于计算机图形技术，先由多边形构造虚拟场景的三维几何模型，再由计算机根据用户的观察点和观察方向实时绘制出用户所看到的虚拟场景．ＨＶＳ采用了另一种思路，由计算机自动拼接、变形与组织许多幅离散的实景图象或连续的视频，生成虚拟场景．这种虚拟场景具有照片质量的视觉效果，被我们称为虚拟实景空间．虚拟实景空间能为用户提供前进、后退、仰视、俯视、３６０度环视、近看、远看等漫游能力，运行它不需要高性能的图形工作站，可运行于ＰＣ平台．ＨＶＳ是虚拟实景空间的生成与漫游平台，最近由我们自主开发成功，本文将对其空间模型、系统组成与部分关键技术进行总结．

Traditionally, the virtual reality systems use 3D computer graphics to model and render a virtual environment in real time. This approach usually requires laborious modeling and expensive rendering hardware. For this reason, HVS use panoramic video and multivision technology to construct a photoquality virtual reality system. Panoramic video is based on 360 degree panorama of real world scene, captured by the normal camera. Multivision provides an approach of information organization. It makes use of many panoramic videos to build a navigable virtual information space. Users can browse and immerse in this virtual information space. HVS was developed on personal computers. This paper summarizes the spatial model and implementation of HVS.