基于边界曲面零交叉点的体绘制

Volume rendering based on zero-cross points of boundary surface

体绘制中体元二义性使灰度—梯度幅值传递函数空间中出现拱形区域,可视化工具操作者难以快速、准确地选取出感兴趣目标。针对这个问题,介绍了一种在传递函数空间引入边界曲面零交叉点特征的算法。该算法结合面绘制移动立方体算法跟踪边缘立方体并记录所有边界曲面的零交叉点,并利用这些零交叉点的特征信息对灰度—梯度特征空间进行重构并选取感兴趣边界曲面。最后通过实验证明了上述方法对目标边界曲面的选取行之有效。

The arch of transfer function space based on gray and gradient amplitude result in voxel＇ s ambiguity in volume ren- dering, which made interested targets cannot be selected quickly and precisely by operator of visualization tool. This paper proposed a new algorithm that zero-cross points of boundary surface introduced in the 2-dimensional feature space. This algo- rithm utilized Marching-cube to trace boundary cubes and record all zero-cross points（ZCP） of these cubes. Then the feature space could be reconstructed with these points to assist selected interested boundary surfaces. In the end, some experiments conducted proves this method effectively helps render boundary surfaces.