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相关概念视频

Measurements of Strain01:27

Measurements of Strain

704
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
704
Distance Measurements by Taping01:18

Distance Measurements by Taping

33
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...
33
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

33
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
33
Area Computation by the Alternative Coordinate Method01:24

Area Computation by the Alternative Coordinate Method

52
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...
52

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Updated: Jun 24, 2025

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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三维测量方法基于重复使用相等距离的二进制条纹.

Fei Yan, Peiyue Wu, Cheng Sun

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    概括
    此摘要是机器生成的。

    本研究介绍了一种新的二进制条纹编码方法,通过克服非线性投影机和摄像机错误来提高3D重建的准确性. 新方法显著提高了复杂物体的测量精度和细节.

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    相关实验视频

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 计算机视觉 计算机视觉
    • 计量学 计量学 计量学

    背景情况:

    • 商业投影机和相机中的非线性错误会影响3D测量的准确性.
    • 现有的相位转移方法可能容易受到这些非线性,限制精度.

    研究的目的:

    • 介绍一种使用二进制条纹进行编码的新方法,以消除3D重建中的非线性错误.
    • 与传统相位移技术相比,提高3D测量的精度和质量.

    主要方法:

    • 生成和投影带有像素移动的二进制条形图,以创建不同的条形图.
    • 在3D重建中重新使用获得的二进制条纹,并结合相位移方法.
    • 叠加二进制条纹以有效地将它们减少到与相位移的侧面条纹.

    主要成果:

    • 与传统的16步相位移方法相比,获得了比传统的16步相位移方法高13.88%的包裹相位精度.
    • 增加了21.05%的标准球测量精度.
    • 对于复杂的物体,产生了更光滑,更微妙的点云.

    结论:

    • 拟议的二进制条纹编码方法有效地克服了3D重建中的非线性错误.
    • 这种技术在测量准确度和表面细节方面提供了显著的改进.
    • 该方法为精确的3D测量应用提供了更强大的解决方案.