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1.
在医学辅助教学或临床诊疗中,为了帮助研究人员对人体内部信息的观察和检测,需要对医学CT数据进行三维可视化。针对这一情况,为了更好地实现医疗三维可视化效果,提出以可视化工具包VTK和VC++6.0为开发平台,并对可视化工具VTK的基本组成、可视化原理和流程进行了研究分析,采用面绘制的Marching Cubes算法和体绘制的Ray Casting算法对医学CT图像三维可视化。实验结果表明,采用上述算法对CT图像进行可视化能够得到很好的重建效果。  相似文献   

2.
三维数据场可视化是目前计算机图形学方向研究的热点之一,随着人们需求的不断提高,对图形绘制的实时性及交互性提出了更高的要求。本文主要阐述了在CUDA架构下,利用GPU的多核并行运算能力,对实现三维数据场可视化的光线投射算法进行优化和改进。将图形处理的几何阶段在可编程硬件实现,实现图形绘制的加速。实验结果表明,在一定程度上改善了成像效果,绘制速度的加速比达到7左右。  相似文献   

3.
针对采样运动规划算法效率低,尤其在处理高维空间和复杂障碍环境等问题时,严重依赖于所选采样参数和碰撞检测距离等,提出了一种自适应双向快速密集树(ABiRDT)避碰运动规划方法。首先,深入研究了ABiRDT算法的基础理论和实现方法,可适应调整碰撞检测距离参数和随机采样扩展步长;其次,重点研究了本算法所采用的c-空间加权均匀采样、最近邻位形查找和基于混合包围盒的并行离散碰撞检测等关键自适应策略;最后,通过三维可视化计算机仿真验证了本文提出算法的有效性。  相似文献   

4.
针对当前计算机算法类课程逻辑性强又极为抽象的问题,我院引入三维视景仿真技术,研究开发出一套以应用为导向结合计算机专业关键算法的辅助教学演示工具。它能有效改善算法实验环境的二维空间局限性,实现算法可视化从二维到三维的跳变,从而获得更好的教学效果和更大的教育意义。  相似文献   

5.
实时三维交互式仿真技术是实现道路线路三维可视化设计的关键,基于CDT(Constrained Delaunay Triangulation)理论建立三维道路地形整体模型,构建出外观与内部拓扑关系均为整体的道路三维模型,在此基础上,讨论了可视化要点,最终实现道路线路的三维可视化。  相似文献   

6.
OpenGL是当今业界最为广泛使用的三维图形技术标准.本文以模拟三维地形数据为基础,针对地理信息区域的三维地形可视化,探讨了在Visual Basic环境下实现三维地形的模拟以及三维可视化的原理和方法,并给出了部分相关的实现代码.  相似文献   

7.
详细讨论一类标准层次图的分段算法及其在最短路径上的应用,分段算法及应用在机器上得到了实现,算法的综合时间复杂度为0(e),较一些传统方法要好.  相似文献   

8.
介绍了Fast Marching快速行进图像分割和Marching Cubes步进立方体2种算法的原理,利用ITK的图像读取与处理功能及VTK在可视化方面的突出能力,将二者有机地集成起来,通过ITK和VTK实现这2种算法,最终生成三维立体医学图像。实验结果验证了该方法可以得到病理部位的详细特征,在医学图像三维成像方面有良好的性能。  相似文献   

9.
面向高维数据的聚类分析是当今数据挖掘研究的重要领域,其中的关键问题在于如何对高维数据的聚类结果进行高效率的可视化分析。针对这一问题首先使用了数据聚合树(DA树)作为代表高维数据集的数据结构,并将一个新的聚集算法(CLUK算法)应用于该数据集,获得聚类分析的结果,然后搭建了一个可视化平台(Hvis),最后利用平行坐标法在...  相似文献   

10.
在采煤沉陷区建立三维Web GIS平台,实现沉陷区数据三维可视化,提供用户便捷有效的数据管理、分析、浏览、查询服务,并为采煤沉陷区环境治理提供决策依据具有重要意义。Google Earth API和Java Script技术的结合,能够实现在Google地球上绘制标记、线条和多边形、投射图片、添加3D模型及载入KML文件,在网页上实现几乎所有Google Earth功能。本文以淮南煤矿为研究区,基于Google Earth API,结合Web GIS理论,采用Java Script技术,面向采煤沉陷区数据集中管理与可视化,设计开发了集空间数据、属性信息和专题分析于一体的采煤沉陷区三维可视化平台,有效管理矿区多源数据,提供数据可视化浏览、查询与飞行模拟等功能,有助于沉陷区生态环境问题的综合分析,为沉陷区生态环境治理和恢复提供决策支持。  相似文献   

11.
INTRODUCTION The past decades witnessed unprecedented ad-vances in the imaging science fields(Yelbuz et al.,2002;Campagnola et al.,2002;Sharpe et al.,2002).The technique of3D image reconstruction andanalysis plays a significant role in the basic researchof life science,which developed from2D imageprocessing but provides more information than2Dimage,and has rapidly expanded to molecular andcellular field(Guo et al.,1995;Trehan et al.,2003).Despite the rapid development of the new field,…  相似文献   

12.
人体三维几何建模及其可视化显示是生物医学学科的一项基础性研究。CT和MRI等医学成像技术的断层图像可为三维建模提供基础。章论述和介绍了基于CT、MRI断层图像的三维建模系统的关键技术和相关实现原理。  相似文献   

13.
This paper explores brain CT slices segmentation technique and some related problems, including contours segmentation algorithms, edge detector, algorithm evaluation and experimental results. This article describes a method for contour-based segmentation of anatomical structures in 3D medical data sets. With this method, the user manually traces one or more 2D contours of an anatomical structure of interest on parallel planes arbitrarily cutting the data set. The experimental results showed the segmentation based on 3D brain volume and 2D CT slices. The main creative contributions in this paper are: (1) contours segmentation algorithm; (2) edge detector; (3) algorithm evaluation. Project (No.69931010) supported by the National Natural Science Foundation of China  相似文献   

14.
Tomographic particle image velocimetry(Tomo-PIV) is a state-of-the-art experimental technique based on a method of optical tomography to achieve the three-dimensional(3D) reconstruction for threedimensional three-component(3D-3C) flow velocity measurements. 3D reconstruction for Tomo-PIV is carried out herein. Meanwhile, a 3D simplified tomographic reconstruction model reduced from a 3D volume light intensity field with 2D projection images into a 2D Tomo-slice plane with 1D projecting lines, i.e., simplifying this 3D reconstruction into a problem of 2D Tomo-slice plane reconstruction, is applied thereafter. Two kinds of the most well-known algebraic reconstruction techniques, algebraic reconstruction technique(ART) and multiple algebraic reconstruction technique(MART), are compared as well. The principles of the two reconstruction algorithms are discussed in detail, which has been performed by a series of simulation images, yielding the corresponding reconstruction images that show different features between the ART and MART algorithm, and then their advantages and disadvantages are discussed. Further discussions are made for the standard particle image reconstruction when the background noise of the pre-initial particle image has been removed. Results show that the particle image reconstruction has been greatly improved. The MART algorithm is much better than the ART. Furthermore, the computational analyses of two parameters(the particle density and the number of cameras), are performed to study their effects on the reconstruction. Lastly, the 3D volume particle field is reconstructed by using the improved algorithm based on the simplified 3D tomographic reconstruction model, which proves that the algorithm simplification is feasible and it can be applied to the reconstruction of 3D volume particle field in a Tomo-PIV system.  相似文献   

15.
INTRODUCTIONSegmentation ,acentralissueofcomputervision ,isafundamentalprocessingstepinmostsystemsthatsupportmedicaldiagnosisorplan ningofsurgicaloperationsandradiationtreat ments (Wyattetal.,2 0 0 0 ;Wintereretal.,2 0 0 2 ;Baoetal.,1998) .Contour basedse…  相似文献   

16.
提出了一种自适应B-样条曲面重构的算法,并利用Matlab语言实现了基于散乱数据的B-样条曲面重构的可视化.  相似文献   

17.
INTRODUCTION 3D echocardiography has been widely used in diagnostic cardiology because it can visualize the complex structure of heart more accurately than pre-vious used 2D diagnosis method. Currently, there are two major image acquisition methods of 3D echo-cardiography, i.e., random data acquisition and se-quential data acquisition (Roelandt, 2000). The for-mer uses a spatial locator to measure the position and orientation of the ultrasound probe, allowing unre-stricted (free-hand) s…  相似文献   

18.
Thecontinuoustechnicaldevelopmentincomputergraphics ,scientificvisualizationandmedicalscannertechnol ogyhasmadepossiblefastandaccuratethree dimensionalmedicalvisualizationfrommulti slicesoftomographyimagesoverthepastdecade .Traditionaltomographyimagesusedinthree dimensionalreconstructionsaremainlyfromcomputer izedtomography (CT) .Thelatestresearchesextendthedo maintomagneticresonanceimaging (MRI) ,computerizedto mographyangiography (CTA) ,singlephotoemissiontomogra phy(SPET) ,positronemiss…  相似文献   

19.
周围神经CT图像增强是周围神经三维重建中的基础环节,本文在分析高斯圆模型Hessian矩阵特征值特点的基础上,提出一种基于Hessian矩阵多尺度滤波的周围神经CT图像增强算法.实验证明该方法能够使似圆形周围神经区域得以增强,抑止其他非圆形区域的干扰,得到较好的周围神经增强图像,为后续的分割与三维重建奠定基础.  相似文献   

20.
体视化技术即三维可视化技术,通过数据处理、成像算法、图像处理等技术,有效解决采矿设计中平面视图不够立体直观的问题。着重介绍和探讨体视化技术在露天开拓中的应用,包括露天开拓设计方面,露天开拓生产方面和露天开拓技术经济方面,有助于更好地理解矿体的空间信息以及矿体与工程布置之间的空间位置关系。  相似文献   

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