基于球面全景图的虚拟场景实时漫游系统

摘要

A virtual scene real time navigation system is designed and implemented based on spherical panorama .Spherical pano-rama rendering can be achieved by re-projection method .Different perspective views of the virtual scene can be obtained by re-projecting visible portion of the spherical panorama onto the view plane .Camera rotation can be accomplished with the re-projec-tion of a spherical panorama and image rotation , and camera zooming can be accomplished through changing the camera '' s field of view.In order to achieve real-time rendering demand, the paper analyses the re-projection process carefully and uses look-up ta-bles and incremental computing to accelerate spherical panorama rendering .The system can render virtual scene based on spheri-cal panorama in real time with high frame per second .%设计并实现一种基于球面全景图的虚拟场景实时漫游系统. 虚拟场景的实时漫游可以通过对球面全景图进行重投影完成. 通过重投影球面全景图的可视部分到视平面上,可以生成虚拟场景在不同视线方向上的透视视图. 使用球面全景图的重投影算法可以模拟相机的旋转运动,通过改变相机的视域,可以模拟相机的变焦运动. 针对直接使用重投影不能满足球面全景图实时绘制的问题,在对球面全景图的重投影算法进行仔细分析的基础上,提出使用查找表和增量计算进行加速的策略. 实验结果表明,优化后的系统能够对基于球面全景图的虚拟场景进行实时漫游.