Creating and rendering intermediate geometric primitives is one of the approaches to visualize data sets in 3D space. Some algorithms have been developed to construct isosurface from uniformly distributed 3D data sets...Creating and rendering intermediate geometric primitives is one of the approaches to visualize data sets in 3D space. Some algorithms have been developed to construct isosurface from uniformly distributed 3D data sets. These algorithms assume that the function value varies linearly along edges of each cell. But to irregular 3D data sets, this assumption is inapplicable. Moreover, the depth sorting of cells is more complicated for irregular data sets, which is indispensable for generating isosurface images or semitransparent isosurface images, if Z-buffer method is not adopted.In this paper, isosurface models based on the assumption that the function value has nonlinear distribution within a tetrahedroll are proposed. The depth sorting algorithm and data structures are developed for the irregular data sets in which cells may be subdivided into tetrahedra. The implementation issues of this algorithm are discussed and experimental results are shown to illustrate potentials of this technique.展开更多
为了给海地瓜识别工作提供数据参考,解决传统数据集构建中存在的数据重复率高的问题,笔者提出基于3D Studio Max的海地瓜数据集构建方法。该方法首先利用硬件设备采集海地瓜的三维数据,并对初始数据进行降噪和去重处理,然后构建海地瓜模...为了给海地瓜识别工作提供数据参考,解决传统数据集构建中存在的数据重复率高的问题,笔者提出基于3D Studio Max的海地瓜数据集构建方法。该方法首先利用硬件设备采集海地瓜的三维数据,并对初始数据进行降噪和去重处理,然后构建海地瓜模型,最后以海地瓜模型为数据内容进行分类存储,实现海地瓜数据集的构建。实验结果表明:该方法的数据重复率降低了5.43%,能够有效提升识别的速度。展开更多
文摘Creating and rendering intermediate geometric primitives is one of the approaches to visualize data sets in 3D space. Some algorithms have been developed to construct isosurface from uniformly distributed 3D data sets. These algorithms assume that the function value varies linearly along edges of each cell. But to irregular 3D data sets, this assumption is inapplicable. Moreover, the depth sorting of cells is more complicated for irregular data sets, which is indispensable for generating isosurface images or semitransparent isosurface images, if Z-buffer method is not adopted.In this paper, isosurface models based on the assumption that the function value has nonlinear distribution within a tetrahedroll are proposed. The depth sorting algorithm and data structures are developed for the irregular data sets in which cells may be subdivided into tetrahedra. The implementation issues of this algorithm are discussed and experimental results are shown to illustrate potentials of this technique.
文摘为了给海地瓜识别工作提供数据参考,解决传统数据集构建中存在的数据重复率高的问题,笔者提出基于3D Studio Max的海地瓜数据集构建方法。该方法首先利用硬件设备采集海地瓜的三维数据,并对初始数据进行降噪和去重处理,然后构建海地瓜模型,最后以海地瓜模型为数据内容进行分类存储,实现海地瓜数据集的构建。实验结果表明:该方法的数据重复率降低了5.43%,能够有效提升识别的速度。
