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该文提出基于网络实时交互的海量三维地形数据的流式处理方案。通过一个输出恒定的动态多分辨率简化算法,对三维地形数据进行裁剪简化,实现与总数据量和视点位置无关的恒定数据量输出;在算法输出的非均匀高程矩阵上,进一步采用三维地形数据流式编码解码算法,将高程矩阵进行离散余弦变换到频率域,并根据频谱分析结果引入累进式传输编码解码,结合服务质量控制,根据客户端和网络的性能状况进行自适应调节。实验表明,流式处理方案可以根据运行平台性能提供不同质量的场景复原,达到基于网络的实时交互性能。 更多还原

【Abstract】 Enlightened by stream medium technology,this paper proposes a method handling 3D terrain data in streaming way for real-time interaction based on network.At the beginning,a stable output depending on dynamic multi-resolution simplification algorithm is applied to get a series of fix-sized non-uniform elevation matrices.A streaming code based on DCT for terrain data is then introduced.The non-uniform elevation matrix is transformed by the code to frequency domain and results in a coefficient matr...