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Efficient ray casting of volumetric images using distance maps for empty space skipping
Computational Visual Media ( IF 17.3 ) Pub Date : 2020-01-23 , DOI: 10.1007/s41095-019-0155-y
Lachlan J. Deakin , Mark A. Knackstedt

Volume and isosurface rendering are methods of projecting volumetric images to two dimensions for visualisation. These methods are common in medical imaging and scientific visualisation.Head-mounted optical see-through displays have recently become an affordable technology and are a promising platform for volumetric image visualisation. Images displayed on a head-mounted display must be presented at a high frame rate and with low latency to compensate for head motion. High latency can be jarring and may cause cybersickness which has similar symptoms to motion sickness.Volumetric images can be very computationally expensive to render as they often have hundreds of millions of scalar values. Fortunately, certain materials in images such as air surrounding an object boundary are often made transparent and need not be sampled, which improves rendering efficiency.In our previous work we introduced a novel ray traversal technique for rendering large sparse volumetric images at high frame rates. The method relied on the computation of an occupancy and distance map to speed up ray traversal through empty regions.In this work we achieve higher frame rates than our previous work with an improved method of resuming empty space skipping and the use of anisotropic Chebyshev distance maps. An optimised algorithm for computing Chebyshev distance maps on a graphical processing unit is introduced supporting real-time transfer function editing.

中文翻译:

使用距离图有效跳过空间图像,从而有效地投射空间图像

体积和等值面渲染是将体积图像投影到二维以进行可视化的方法。这些方法在医学成像和科学可视化中很常见。头戴式光学透视显示器最近已成为一种可负担的技术,并且是用于体积图像可视化的有前途的平台。头戴式显示器上显示的图像必须以高帧频和低延迟显示,以补偿头部运动。高延迟可能会令人不快,并可能导致晕车,其症状类似于晕车。体积图像的渲染计算量非常大,因为它们通常具有数亿个标量值。幸运的是,图像中的某些材料(例如围绕对象边界的空气)通常是透明的,无需采样,在以前的工作中,我们介绍了一种新颖的射线遍历技术,可以以高帧频渲染大型稀疏体积图像。该方法依赖于占用率和距离图的计算来加快光线在空白区域中的遍历。在这项工作中,我们通过改进的恢复空白空间跳跃的方法以及使用各向异性的切比雪夫距离图来实现比以前的工作更高的帧速率。 。介绍了一种用于在图形处理单元上计算切比雪夫距离图的优化算法,该算法支持实时传递函数编辑。该方法依赖于占用率和距离图的计算来加快光线在空白区域中的遍历。在这项工作中,我们通过改进的恢复空白空间跳跃的方法以及使用各向异性的切比雪夫距离图来实现比以前的工作更高的帧速率。 。介绍了一种用于在图形处理单元上计算切比雪夫距离图的优化算法,该算法支持实时传递函数编辑。该方法依赖于占用率和距离图的计算来加快光线在空白区域中的遍历。在这项工作中,我们通过改进的恢复空白空间跳跃的方法以及使用各向异性的切比雪夫距离图来实现比以前的工作更高的帧速率。 。介绍了一种用于在图形处理单元上计算切比雪夫距离图的优化算法,该算法支持实时传递函数编辑。
更新日期:2020-01-23
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