基于光场的三维虚拟漫游系统

近年来基于图象的绘制方法有了很大发展，其中光场方法提供了一种有效的四维参数化模型，但是这种四维函数局限于无遮挡的空间。为了在有遮挡的环境中运行，这种四维光场函数被扩展为五维光场函数，然而该方法在显示速度上仍达不到实时。采用基于狭缝图象的四维光场模型，以减少视点在垂直方向上的自由度为代价，使在有遮挡的环境中漫游速度大大加快。介绍了光场的表示、自适应非均匀采样、重采样的过程，并在内存管理、路径预测和碰撞检测等方面做了处理，使得在漫游过程中帧间图象过渡连续。最后以澳门科技大学学生活动中心为例，实现了三维漫游系统，漫游速度可以达到准实时。

3D Navigation based on light field

Recently, image-based rendering approach has been developed rapidly. 4D Light Field is one of the efficient models. Because it is limited in non-occluded environment, 5D Light field is expanded from it to solve this problem. But real-time rendering can not be realized. In this paper, 4D light field based on slit images is presented. At the loss of the freedom of vertical direction, the rendering process in occluded environment is much accelerated. We discuss the representation, adaptive nonuniform sampling and resampling of the 4D light field. Besides, some work for memory management, track prediction and collision detection were also done so that images between frames can be continuous. At last, an example system of Macao University showed the efficiency of the algorithms discussed.