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1. 发明授权

US06313841B1 Parallel volume rendering system with a resampling module for parallel and perspective projections 失效
标题翻译：具有用于并行和透视投影的重采样模块的并行体绘制系统
公开(公告)号：US06313841B1
公开(公告)日：2001-11-06
申请号：US09059155
申请日：1998-04-13
申请人： Masato Ogata , TakaHide Ohkami , Hugh C. Lauer
发明人： Masato Ogata , TakaHide Ohkami , Hugh C. Lauer
IPC分类号： G06T1700
CPC分类号： G06T15/10
摘要： A volume rendering system re-samples voxels read from a voxel memory to generate samples along perspective rays cast from a center of projection using a level of detail value. Color computations are performed with the samples to produce pixels for a baseplane image. The level of detail is computed, at each plane of samples perpendicular to a principal viewing axis, from the current sample position and the distance between the center of projection and the baseplane; the principal viewing axis is the coordinate axis in a rendered volume most parallel with a viewing vector. The level of detail provides a measure of the distance between two neighboring perspective rays at each plane and is used to determine the number of voxels and weights for these voxels required to compute a single sample at each plane. Multi-resolution datasets prepared for different levels of details are used to simplify the resampling operation by limiting the number of voxels required to compute a single sample.
摘要翻译：体绘制系统重新对从体元记忆读取的体素进行重新采样，以使用一定程度的细节值从投影中心投射的透视光线生成样本。使用样本执行颜色计算，以生成基板图像的像素。在垂直于主观察轴的样本的每个平面处，从当前采样位置和投影中心与基板之间的距离计算细节水平; 主观察轴是与观看向量最平行的渲染卷中的坐标轴。细节水平提供了每个平面上两个相邻透视射线之间的距离的度量，并且用于确定在每个平面处计算单个样本所需的这些体素的体素数和权重。用于不同级别细节的多分辨率数据集用于通过限制计算单个样本所需的体素数来简化重采样操作。

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