基于虚拟视点的大规模数值模拟的可交互式原位可视化

Virtual Viewpoint Based Interactive In-situ Visualization of Large-Scale Simulation

【目的】原位可视化是解决大规模数值模拟结果数据难以输出到磁盘进行后处理可视化的有效途径,但是当前的原位可视化主要是为专家提供浏览模式,难以进行交互式探索。所以研究原位可视化的交互技术对帮助专家分析数值模拟结果具有重要意义。【方法】本文提出了一种基于虚拟视点的可交互式原位可视化方法。为了解决原位可视化图像采样不全的问题,我们设计了基于深度图的虚拟视点合成方法,补充了用于三维重建的虚拟视点图像。然后为了展示数值模拟结果的整体特征,将生成的虚拟视点图像和原始图像进行图像拼接。最后对拼接而成的完整图像进行三维重建生成了可供交互的模型,解决了原位可视化图像难以帮助专家在空间上交互的问题。【结果】我们使用了二维和三维等不同数值模拟生成的原位可视化图像进行实验验证,证明了本文提出的可交互式原位可视化方法的有效性。【局限】图像处理技术在不断发展,未来希望对原位可视化数据与图像处理的交互式结合进行更多的探索。【结论】本文设计了一种基于虚拟视点的可交互式原位可视化方法,可以有效地帮助专家准实时观察和分析大规模数值模拟所有中间结果的细节。

[Objective]In-situ visualization is an effective way to solve the problem of outputting large-scale numerical simulation results to the hard disk for post-processing visualization.However,the current in-situ visualization methods mainly provide browsing mode for experts,which fails to conduct interactive exploration.Therefore,the study of interactive technology for in-situ visualization is essential for helping experts in analyzing the results of numerical simulations.[Methods]We present an interactive in-situ visualization method based on virtual viewpoint to help experts visually explore numerical simulations.Firstly,in order to resolve the problem of incomplete sampling of in-situ visualization images,a virtual viewpoint synthesis method is designed to supplement virtual viewpoint images for 3D reconstruction.Then,based on raw images and the generated virtual viewpoint images,an image stitching method is proposed to show the overall characteristics of in-situ visualization images.Finally,the interactive model can be generated through 3D reconstruction from the stitched images.[Results]In order to demonstrate the effectiveness of the proposed interactive in-situ model,several different numerical simulations are carried out.As a result,the generated in-situ visualization results can be interactively explored by domain scientists.[Limitations]Because that the image processing technology is constantly evolving,we hope to conduct more explorations on combination of in-situ visualization image data and interactive image processing in the future.[Conclusions]In this paper,a virtual viewpoint-based interactive in-situ visualization method is proposed.It can successfully help experts to interactively explore the intermediate output data of large-scale simulation.