共查询到20条相似文献,搜索用时 109 毫秒
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在体素几何模型中 ,物体由体素表示 ,物体表面由边界体素表示。当体素大小与屏幕像素大小相等时 ,可把边界体素作为点向投影面投影 ,但这样易产生空洞现象和图像走样。基于物体边界体素 ,生成一个绘制表面 ,用光线投射法显示这个绘制表面 ,可以消除空洞现象 ,减轻图像走样。这种算法能生成光滑细腻的图像。本文生成绘制表面的速度比 Dividing Cubes算法生成表面的速度快 相似文献
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本文主要是针对传统意义上的体绘制的经典算法——光线投射算法,在已有的GPU加速的基础上,提出了利用CUDA实现对算法的优化和加速。具体来讲,首先需要将体数据以三维纹理的形式储存在GPU的显存中,之后利用CUDA的并行处理能力对显存中的数据进行相应的处理,主要包括:生成存储顶点灰度值和颜色的纹理数组,计算顶点梯度,实现坐标系的转换,确定有效光线,利用Phong光照模型来求得光线上各等距采样点的反射分量,最后利用累加函数求得屏幕上每一点的像素值。实验结果表明:我们利用CUDA对光线投射算法的实现比传统的GPU加速算法大大提高了速度和成像质量。 相似文献
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本文主要是针对传统意义上的体绘制的经典算法——投射算法,在已有的GPU加速的基础上,提出了利用CUDA实现对算法的优化和加速。具体来讲,首先需要将体数据以三维纹理的形式储存在GPU的显存中,之后利用CUDA的并行处理能力对显存中的数据进行相应的处理,主要包括:生成存储顶点灰度值和颜色的纹理数组,计算顶点梯度,实现坐标系的转换,确定有效光线,利用Phong光照模型来求得光线上各等距采样点的反射分量,最后利用累加函数求得屏幕上每一点的像素值。实验结果表明:我们利用CUDA对光线投射算法的实现比传统的GPU加速算法大大提高了速度和成像质量。 相似文献
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机构设计的设计方法由传统的单元技术向复杂大系统环境下的设计自动化技术转变,其中一个重要方面就是实现设计的网络化和可视化。VRML为实现机构设计的网络化和三维可视化提供了新的统一的平台。同时讨论了其中的一些关键技术。 相似文献
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This paper presents a new volume visualization approach for three‐dimensional (3‐D) interactive microscopy data exploration. Because of their unique image characteristics, 3‐D microscopy data are often not able to be visualized effectively by conventional volume visualization techniques. In our approach, microscopy visualization is carried out in an interactive data exploration environment, based on a combination of interactive volume rendering techniques and image‐based transfer function design methods. Interactive volume rendering is achieved by using two‐dimensional (2‐D) texture mapping in a Shear‐Warp volume rendering algorithm. Image processing techniques are employed and integrated into the rendering pipeline for the definition and searching of appropriate transfer functions that best reflect the user's visualization intentions. These techniques have been implemented successfully in a prototype visualization system on low‐end and middle‐range SGI desktop workstations. Since only 2‐D texture mapping is required, the system can also be easily ported to PC platforms. 相似文献
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介绍了在新应用需求下,通过将集群技术、图形调节和远程桌面等多项技术整合,形成基于三维远程可视化技术的设计平台完整解决方案,方案具备设备集中管理、资源统筹调配和服务标准提供等应用优势,为科研设计任务中涉及的结构建模、前/后处理等设计阶段提供相应的计算资源支撑。 相似文献
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首先简要介绍了三维工厂布局规划平台,然后以三一集团宁乡产业园为例,对三维布局规划实施流程进行了介绍,结果表明三维工厂布局规划平台能提高布局规划的效率、优化布局方案。 相似文献
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为了解决铸造生产中相同类型铸件的历史工艺复用问题,提出了一种法向算子和D2算子相结合的铸件三维模型分类算法。该方法从三维模型的面特征和点特征信息出发,分别提取三维模型的法向算子和D2算子特征描述符,通过度量新铸件模型和各类别模型特征描述符的相似性实现铸件模型分类。在企业实际生产的铸件模型库中的实验结果表明,该方法对常见的铸件类别有很好的特征识别效果,解决了D2算子作为预分类器时处理部分复杂模型时存在的特征不敏感的缺陷,可以获得准确率高的分类结果。 相似文献
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首先简要介绍了三维工厂布局规划平台,然后以三一集团宁乡产业园为例,对三维布局规划实施流程进行了介绍,结果表明三维工厂布局规划平台能提高布局规划的效率、优化布局方案. 相似文献
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M. R. Arnison C. J. Cogswell† N. I. Smith P. W. Fekete & K. G. Larkin 《Journal of microscopy》2000,199(1):79-84
Differential interference contrast (DIC) is frequently used in conventional 2D biological microscopy. Our recent investigations into producing a 3D DIC microscope (in both conventional and confocal modes) have uncovered a fundamental difficulty: namely that the phase gradient images of DIC microscopy cannot be visualized using standard digital image processing and reconstruction techniques, as commonly used elsewhere in microscopy. We discuss two approaches to the problem of preparing gradient images for 3D visualization: integration and the Hilbert transform. After applying the Hilbert transform, the dataset can then be visualized in 3D using standard techniques. We find that the Hilbert transform provides a rapid qualitative pre-processing technique for 3D visualization for a wide range of biological specimens in DIC microscopy, including chromosomes, which we use in this study. 相似文献
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本文提出了利用独立面片模型渲染的参数组群,对城市三维数字模型的进行渲染的方法。该方法解决了超大规模数字模型的渲染与软硬件设备和工作效率之间的矛盾。提高了城市三维数字模型的渲染速度和成像质量,降低了快速三维渲染成像的成本。 相似文献
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The final result of an electron tomographic reconstruction, computed from several projections, is a 3-D array of data which resides in the computer memory as a long string (from 323 to 2563) of numbers. It is vital to retrieve information relevant to biology from this vast amount of numbers, and to share it with the scientific community. This is done with the use of visualization processes that may represent the most time consuming task in a reconstruction. The present article describes a technique of surface rendering designed by the authors to represent structures characterized by the presence of a number of subunits and of features such as branching, holes and cavities. The software used produces a ‘structure’ (an array containing different types of variables, peculiar to the C programming language) that is able to exploit the resources of the graphic engines embedded in modern workstations and of graphic libraries. This structure can be used to produce visual presentations in the form of wireframe- and surface-rendered models with shading determined by the Gouraud algorithm. 相似文献
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Evaluation of rapid volume changes of substrate-adherent cells by conventional microscopy 3D imaging 总被引:3,自引:0,他引:3
Precise measurement of rapid volume changes of substrate‐adherent cells is essential to understand many aspects of cell physiology, yet techniques to evaluate volume changes with sufficient precision and high temporal resolution are limited. Here, we describe a novel imaging method that surveys the rapid morphology modifications of living, substrate‐adherent cells based on phase‐contrast, digital video microscopy. Cells grown on a glass substrate are mounted in a custom‐designed, side‐viewing chamber and subjected to hypotonic swelling. Side‐view images of the rapidly swelling cell, and at the end of the assay, an image of the same cell viewed from a perpendicular direction through the substrate, are acquired. Based on these images, off‐line reconstruction of 3D cell morphology is performed, which precisely measures cell volume, height and surface at different points during cell volume changes. Volume evaluations are comparable to those obtained by confocal laser scanning microscopy (ΔVolume ≤ 14%), but our method has superior temporal resolution limited only by the time of single‐image acquisition, typically ~100 ms. The advantages of using standard phase‐contrast microscopy without the need for cell staining or intense illumination to monitor cell volume make this system a promising new tool to investigate the fundamentals of cell volume physiology. 相似文献
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面向大型吊装的三维仿真系统 总被引:1,自引:0,他引:1
移动式起重机被广泛地应用在快速发展的桥梁建设、核电、风电、海洋工程、石油化工等行业的建设项目中.事实上,吊装工程师是基于需求、紧急程度和优先级程度来管理和使用移动式起重机,移动式起重机必须要在某个地方,在指定时间内完成它的工作任务.因此,为了降低风险、节约成本、缩短项目周期,这就要求吊装工程师制定一个安全、高效、经济的吊装方案.但是传统的手工迭代式做法非常低效,难以满足当前复杂而大型的吊装工程要求.为此,研发了一款面向大型吊装的三维仿真系统,该系统包含吊装设备及作业环境建模模块、吊索具计算模块、起重机选型模块、起重机参数化建模模块、吊装仿真模块、计算书和CAD图输出模块以及数据库管理模块.最后以石化的一个实际案例验证系统的有效性并展示其主要特点. 相似文献