基于GPU的工业CT三维图像任意断面剖切算法

GPU-based Arbitrary Clipping Rendering Algorithm for 3D Images of the Industrial Computerized Tomography

研究工业CT三维图像的内部信息是无损检测的重要途径。为了实时观察三维图像的任意断面,获取数据信息,提出一种基于GPU的体绘制任意断面剖切算法。该算法基于图形处理器(GPU)单指令多数据流(SIMD)计算方式,通过并行计算内积的方法确定体素与切面的位置关系。当体素位于切面外侧时,则将体素设置为完全透明,使其对显示图像没有贡献,实现了任意断面剖切。还可以实现多断面剖切和结合传输函数的剖切。试验证明,该算法达到交互速度,能够应用于工业无损检测过程中。

In the process of non-destructive testing, it＇s an important approach to explore information from the 3D images of the industrial computerized tomography（ICT）. In order to observing the arbitrary clipping and getting information of the 3D images, a GPU-based arbitrary clipping rendering algorithm is developed. By calculating dot metrix between the position of voxel and the parameter of clipping plane with the single instruction multiple data （SIMD） instruction of the graphics processing unit{ GPU）, this algorithm determines the relationship between voxel and the plane, and then modifies the voxel＇s transparence in parallel According to the dot metrix value, the transparences of voxels outside the plane are set into zero, which makes them no contributions to the result, thus the arbitrary clipping plane is rendered finally. Our approach can also fulfill multiple plane clipping and clipping combined with transfer function. It＇s proved that this approach carries the point for interaction and satisfies the application of non-destructive testing process.