Efficient encoding and rendering of time-varying volume data
Efficient encoding and rendering of time-varying volume data
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发表时间：
1998-06
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通讯作者：
Liu Kwan-Ma;Diann Smith;and Han-Wei Shen
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作者：
Liu Kwan-Ma;Diann Smith;and Han-Wei Shen
时变体积数据集的可视化，这可能是从数值模拟或传感仪器，提供科学家深入了解正在研究的现象的详细动态。本文描述了一种基于量化的相干解决方案，结合八叉树和差分编码，用于可视化时变体积数据。量化用于获得体素级压缩，并且可能对后续编码和可视化步骤的性能具有显著影响。八叉树编码用于空间域压缩，差分编码用于时间域压缩。实质上，如果相邻体素具有相似的值，则它们可以被融合成宏体素，并且如果连续时间步处的子树相同，则它们可以被合并。软件绘制过程是根据树结构和体可视化过程进行裁剪的。利用树表示，可以非常有效地执行选择性渲染。此外，还降低了I/O成本。通过这些组合的节省，实现了更高级别的用户交互性。我们研究了各种时变体积数据集，基于数据统计进行编码，并尽可能优化渲染计算。在工作站上进行的初步测试表明，在许多情况下，帧间延迟大大减少，减少幅度高达9。
Visualization of time-varying volumetric data sets, which may be obtained from numerical simulations or sensing instruments, provides scientists insights into the detailed dynamics of the phenomenon under study. This paper describes a coherent solution based on quantization, coupled with octree and difference encoding for visualizing time-varying volumetric data. Quantization is used to attain voxel-level compression and may have a significant influence on the performance of the subsequent encoding and visualization steps. Octree encoding is used for spatial domain compression, and difference encoding for temporal domain compression. In essence, neighboring voxels may be fused into macro voxels if they have similar values, and subtrees at consecutive time steps may be merged if they are identical. The software rendering process is tailored according to the tree structure and the volume visualization process. With the tree representation, selective rendering may be performed very efficiently. Additionally, the I/O costs are reduced. With these combined savings, a higher level of user interactivity is achieved. We have studied a variety of time-varying volume datasets, performed encoding based on data statistics, and optimized the rendering calculations wherever possible. Preliminary tests on workstations have shown in many cases tremendous reduction by as high as 9 inter-frame delay.