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相关概念视频

Stereoisomers02:32

Stereoisomers

17.5K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Distance Measurements by Taping01:18

Distance Measurements by Taping

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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

704
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
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相关实验视频

Updated: Jan 16, 2026

Robotized Testing of Camera Positions to Determine Ideal Configuration for Stereo 3D Visualization of Open-Heart Surgery
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多摄像头3D数字图像与点向优化的基于模型的立体声配对相关.

Wenxiang Qin1, Feiyue Wang1, Shaopeng Hu2

  • 1Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima 739-8527, Japan.

Sensors (Basel, Switzerland)
|September 27, 2025
PubMed
概括
此摘要是机器生成的。

一种新的方法,MPMC-DIC,优化了多摄像头数字图像相关性 (MC-DIC) 进行动态变形测量. 它通过智能配对相机来提高准确性和稳定性,克服现有技术的局限性.

关键词:
3D动态变形测量测量 3D动态变形测量3D模型是3D模型.自动相机配对自动相机配对数字图像相关性相关性数字图像相关性多摄像头的几何结构.

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相关实验视频

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科学领域:

  • 工程 工程师 工程师 工程师
  • 测量科学 测量科学 测量科学
  • 计算机视觉 计算机视觉

背景情况:

  • 动态变形测量 (DDM) 对基础设施和工业至关重要.
  • 多摄像头数字图像相关性 (MC-DIC) 提供非接触式3D DDM,但受到低效的摄像头配对和过度分组的影响.
  • 现有的方法导致复杂的设置和不准确的变形测量.

研究的目的:

  • 引入一种新的MC-DIC方法,用于精确和可靠的动态变形测量.
  • 为了克服手动或简单的摄像头配对策略在MC-DIC中的局限性.
  • 为了实现准确的DDM半刚性物体,即使有复杂的背景.

主要方法:

  • 提出了一个基于模型的立体声配对 (MPMC-DIC) 方法.
  • 根据五个关键因素开发了一个自动化系统来评估和选择最佳的相机对.
  • 利用3D模型信息和校准的摄像头数据来选择对.

主要成果:

  • 在一个气实验中,在高达5.0mm的排位上,达到0.03mm的精度的高精度DDM.
  • 使用2x4摄像机阵列,在杂乱的背景下展示了强度.
  • 在具有复杂几何形状的振动PC扬声器上成功执行了广泛的动态变形分析.

结论:

  • MPMC-DIC有效地克服了MC-DIC中的过分分组问题.
  • 拟议的方法提高了动态变形测量的精度和稳定性.
  • MPMC-DIC适用于分析复杂场景和几何结构中的动态变形.