基于几何和图像的混合式图形实时绘制算法

将基于几何和图像的图形绘制算法有机地结合起来,通过逆向Warping技术来实现两预测图像间的光滑过渡．引入了深度值的非线性变换和二阶差分运算,从而实现了由深度图像到三维局部场景的快速层次重建．利用所得到的三维几何模型及纹理映射技术,实现了中间过渡画面的实时生成．实验结果表明,算法对场景复杂性的依赖程度较低,能在中低档图形工作站上实现复杂场景的实时绘制．     

基于混合式绘制技术的分布式虚拟环境系统

给出了一个基于分布式计算技术的虚拟环境原型系统.系统根据当前摄像机的运动趋势,首先利用预测技术实时地确定下帧图象摄像机的方位,然后分布式地采用基于几何的快速绘制算法来生成预测图象,最后采用图象warping算法来实时生成前后预测图象间的画面过渡.由于引入了几何信息,因而本系统允许用户对虚拟景物进行直接交互操作,从而克服了传统基于图象的图形绘制技术只能处理静态场景的缺陷.实验结果表明,本系统对场景复杂性的依赖程度低,能在中等计算能力的工作站上实现复杂场景的实时交互.     

Real-time rendering algorithm based on a hybrid rendering scheme

A real-time rendering algorithm based on a hybrid rendering scheme is presented. The key frames of the virtual scene are generated with a geometry-based approach, then a non-linear transformation to all visible points of each frame near the current viewpoint is performed to reveal their coplanar characteristics and a hierarchical polygon ap-proximation of the local scene is set up. Any intermediate image between the two key frames could be obtained by re-projecting these polygons onto the view plane related to the current viewpoint. The gaps that might appear on the inter-mediate image are filled through bi-directional backward image warping. Experimental results show that our approach is insensitive to the complexity of the scene and has a satisfactory performance.