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相关概念视频

Distance Measurements by Taping01:18

Distance Measurements by Taping

38
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...
38
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

39
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...
39
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

464
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...
464
Force Classification01:22

Force Classification

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Forces play a crucial role in the study of physics and engineering. They are essential in describing the motion, behavior, and equilibrium of objects in the physical world. Forces can be classified based on their origin, type, and direction of action.
Contact and non-contact forces are two of the most widely used categories of forces. As the name suggests, contact forces require physical contact between two objects to act upon each other. Examples of contact forces include frictional,...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

406
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...
406
Residuals and Least-Squares Property01:11

Residuals and Least-Squares Property

7.4K
The vertical distance between the actual value of y and the estimated value of y. In other words, it measures the vertical distance between the actual data point and the predicted point on the line
If the observed data point lies above the line, the residual is positive, and the line underestimates the actual data value for y. If the observed data point lies below the line, the residual is negative, and the line overestimates the actual data value for y.
The process of fitting the best-fit...
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Updated: Jul 6, 2025

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging
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Published on: April 18, 2025

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在点云中使用特征脱相关性进行阶级不可知跟踪.

Shengjing Tian, Jun Liu, Xiuping Liu

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    此摘要是机器生成的。

    本研究介绍了LiDAR点云的无类跟踪,使模型能够跟踪看不见的对象类别. 一种新的特征脱关系方法通过减少融合特征中的虚假相关性来提高概括性.

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    科学领域:

    • 计算机视觉 计算机视觉
    • 机器人技术 机器人技术 机器人技术
    • 人工智能的人工智能

    背景情况:

    • 在3D点云中单个对象的跟踪对于自主系统至关重要.
    • 当前的深度学习追踪器在训练中未见过的新型对象类别中扎.

    研究的目的:

    • 为LiDAR点云开发一种无类的跟踪方法,可以将其推广到看不见的对象类别.
    • 在遇到新类时解决现有追踪器的性能退化问题.

    主要方法:

    • 研究了最先进的追踪器在未见的类别上的无阶级性能.
    • 提议一种特征折叠关系方法,以限制融合特征并保持概括性.
    • 确保了搜索区域的一致性和前景和背景点之间的区别.

    主要成果:

    • 拟议的特征折叠关系方法显著改善了无类的跟踪性能.
    • 与KITTI和NuScenes数据集上的P2B和BAT等先进追踪器相比,显示了相当大的改进.
    • 通过减少虚假的特征相关性,有效地处理未见物体的跟踪.

    结论:

    • 特性对比是LiDAR点云中强大的类无定性跟踪的关键.
    • 开发的方法为现实世界3D对象跟踪应用提供了更具通用性的解决方案.
    • 这项工作提升了自主系统追踪多样化和以前未遇到的物体的能力.