基于流式渐进传输的大规模网络地形实时漫游  

Real-time Rendering of Large-scale Terrains over Network Based on Progressive Streaming

作　　者：郎兵[1,2] 方金云[1] 韩承德[1] 邹烷[1] 

机构地区：[1]中国科学院计算技术研究所空间信息处理技术实验室,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《系统仿真学报》2010年第2期429-434,共6页Journal of System Simulation

基　　金：国家"九七三"项目(2004CB318202);国家"八六三"项目(2002AA114020;2001AA135210)

摘　　要：针对基于网络大规模三维地形的仿真应用需求,提出一种网络地形流式渐进传输与实时绘制方法,该方法通过提出适用于地形几何特征的整数提升小波变换来构造多分辨率地形四叉树模型,并将地形压缩为渐进比特流,提出了针对流式传输的客户端数据调度与预测算法,并基于视点无关批LOD误差控制实现渐进渲染。实验表明,该方法无层次数据冗余,数据压缩比率高,能够有效降低网络数据传输量,客户端能够适应网络带宽变化,实现大规模网络地形场景的实时交互式漫游。Regarding the requirements of large-scale terrain rendering over network, a new method for supporting interactive high quality remote visualization of large-scale terrains by progressive streaming was proposed. It performs quadtree terrain model simplification based on lifting integer wavelet transform, and compresses data into progressive bitstreams. It also describes an algorithm of client on scheduling and predicting data from bitstreams and rendering by view-independent error evaluation based on aggregated LOD. Experimental results show that the approach has high compression rates and is efficient on large scale interactive remote visualization of terrains over network.

关 键 词：网络地形 提升小波 流式渐进传输 批LOD 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]