共查询到20条相似文献,搜索用时 93 毫秒
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一种多视图的视图分离和视图关系确立方法 总被引:1,自引:0,他引:1
提出一种多视图分离和视图关系确立方法,在分析线条连通集合以及线条连通集合之间包容关系的基础上,进行视图分离;根据制图规划以及图形标注信息建立视图之间的毗邻关系;较好地解决了包括位置任意布的斜视图、局部视图在内的机械零件图多视图的视图分割和视图关系确立问题,为后续图形信息高层理解提供了良好的基础。 相似文献
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为了解决复杂的科学工作流过程视图造成用户理解和数据溯源困难的问题,在对科学工作流及其视图进行形式化定义的基础上,提出一个可保持数据溯源正确性的视图抽象算法——Extend-and-Merge算法.该算法从科学工作流中的一个任务出发,通过寻找及合并三种合理子结构,最终得到保证溯源正确性的合理抽象视图,并设计实现了一个软件工具用于可视化展示.通过一组真实科学工作流过程数据上的实验表明,Extend-and-Merge算法可在多项式时间内获得规模为原来过程13.1%的合理抽象视图. 相似文献
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体视图是《机械制图》教学中较好的虚拟现实模型。绘制体视图一直比较困难。为此提出将SolidWorks模型透视图与"香格里拉机械CAD"软件"描线—补线"手工错切相结合的方法,实现了体视图的简易、近似绘制。 相似文献
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吴学文 《机械工人(冷加工)》2000,(8):32-32,36
笔者发现一些AutoCAD的用户,在标注尺寸及公差时,采用的方法不当,须应用分解、修改的指令后才能完成标注,还误以为软件提供的功能就是如此。实际上,只要掌握了适当的方法,发挥出软件相应功能的作用,用AutoCAD标注尺寸及公差,是一次完成的。这里介绍一种用AutoCAD标注尺寸及公差的方法。 1.按1:1的比例绘图 此处1:1指的是屏幕上一个绘图单位=物体上1mm。采用这一比例不仅是为了便于绘图,节省那 相似文献
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AutoCAD尺寸公差标注的七种方法 总被引:1,自引:0,他引:1
李祥林 《机械工程与自动化》2007,(6):170-172
介绍了AutoCAD2006中尺寸公差的各种标注方法和编辑技巧,以实现尺寸公差的快速标注。 相似文献
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医学三维数据场可视化是当前科学计算可视化应用的重点。在Visual C++平台下,结合可视化工具包VTK,对DICOM格式的CT图像序列进行三维重建。用VTK对CT图像序列进行处理,使其在屏幕上能够显示任意方向的二维断面图像,并且可以用鼠标对断面图像进行缩放、平移、旋转等实时交互操作,从而弥补了CT不能按任意角度扫描的缺憾。 相似文献
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Simultaneous phase and amplitude extraction from a single defocused image of a homogeneous object 总被引:3,自引:0,他引:3
D. Paganin† S. C. Mayo T. E. Gureyev P. R. Miller & S. W. Wilkins 《Journal of microscopy》2002,206(1):33-40
We demonstrate simultaneous phase and amplitude extraction from a single defocused image of a homogeneous object. Subject to the assumptions explicitly stated in the derivation, the algorithm solves the twin‐image problem of in‐line holography and is capable of analysing data obtained using X‐ray microscopy, electron microscopy, neutron microscopy or visible‐light microscopy, especially as they relate to defocus and point projection methods. Our simple, robust, non‐iterative and computationally efficient method is applied to data obtained using an X‐ray phase contrast ultramicroscope. 相似文献
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R.A. Crowther 《Ultramicroscopy》1984,13(3):295-303
Methods are described for producing a three-dimensional reconstruction from a single view of an oblique section through a two- or three-dimensional crystal. The image produced by the electron microscope corresponds to a projection through the thickness of the section, which smears out the details of the structure. This projection operation can be described mathematically by sets of linear projection equations or equivalently by convolution of the density in the unit cell with the section thickness. Solution of the projection equations or other methods of deconvolution reduces the smearing and gives a three-dimensional map of the density within the crystal superior to that obtained by direct inspection of the image. The degree of improvement attainable depends on the noise level in the image but computational experiments indicate that a factor of at least four should be achievable. The method, which is most powerful when the section thickness is small, has the advantage over conventional methods involving tilted that it is not affected by changes in section thickness on electron irradiation. 相似文献
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室内环境中的运动目标检测是计算机视觉领域的研究热点,而移动相机造成的动态背景是运动目标检测的难点。本文提出一种基于同步定位与地图创建(ORB-SLAM)三维背景估计的运动目标检测算法,首先使用移动相机遍历整个室内环境,采用ORB-SLAM技术建立当前全局环境的三维背景特征点云模型;然后基于局部视频建立局部三维特征点云,根据定位信息将当前局部三维特征点云与环境三维背景特征点云进行嵌入,基于环境背景信息,采用三维均值漂移(3DMS)算法,对局部三维特征点云进行前景特征点提取;运用深度卷积神经网络,对提取的前景特征点所在候选区域进行运动目标确认。通过多个室内场景的实际实验进行验证,结果表明本文方法具有较高的运动目标检测准确率和召回率,提出的运动目标检测算法充分利用了三维背景信息,采用深度卷积神经网络进行确认,有效地改善了检测的准确性和鲁棒性。 相似文献
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Yu. Ya. Reutov V. I. Pudov A. V. Volkov 《Russian Journal of Nondestructive Testing》2011,47(9):603-610
The possibilities for determining the distance to a ferromagnetic object with unknown magnetic characteristics by the measurement
of its magnetic field at two spatial points are considered. An unconventional measurement device, which allows us to determine
the distance to an object in real time, as well as an algorithm and software for the processing of measurement results with
the computer-generated visualization of the parameters of a magnetic field induced by an object, were developed. The error
in determining the distance to a sought object does not exceed 20.0%. 相似文献
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KAREL H. M. VAN WELY 《Biocell》2022,46(6):1453-1457
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D. V. Alimov D. V. Vakhrushev A. E. Goldstein 《Russian Journal of Nondestructive Testing》2011,47(10):667-671
The possibility of using a mutually inductive transducer as a measuring transducer of the beats of a round cylindrical surface
in order to measure the axis misalignment of welded joints was investigated. The optimal design values of the transducer were
selected based on the results of physical and mathematical simulations of the transducer’s magnetic field interaction with
a ferromagnetic surface; the influence of the edge effect was estimated as well. 相似文献