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相关概念视频

Orthogonal Trajectories01:26

Orthogonal Trajectories

22
Orthogonal trajectories describe the geometric relationship between two families of curves that intersect each other at right angles. One illustrative case involves a family of parabolas that open sideways along the x-axis. These curves share a common shape but differ by a scaling parameter, resulting in a set of curves that all pass through the origin and widen at different rates.Determining Orthogonal TrajectoriesTo identify the orthogonal trajectories for these parabolas, the first step...
22
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

323
The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
323
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

540
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
540
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

883
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...
883
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

703
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
703
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

705
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...
705

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相关实验视频

Updated: Jan 18, 2026

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

14.1K

深度时空嵌入用于车辆轨迹验证和改进.

Tianya Terry Zhang1,2,3, Peter J Jin1, Benedetto Piccoli2

  • 1Department of Civil and Environmental Engineering, Rutgers University - New Brunswick, New Brunswick, New Jersey, USA.

Computer-aided civil and infrastructure engineering
|September 8, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了一个深度学习模型来验证高角度摄像机的轨迹数据,为运输研究创造了一个可靠的数据集. 这提高了车辆运动分析的准确性.

更多相关视频

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment
08:25

Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment

Published on: May 7, 2019

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相关实验视频

Last Updated: Jan 18, 2026

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

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Combining Eye-tracking Data with an Analysis of Video Content from Free-viewing a Video of a Walk in an Urban Park Environment
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科学领域:

  • 运输工程 运输工程
  • 计算机视觉 计算机视觉
  • 数据科学数据科学数据科学

背景情况:

  • 高角度摄像机对于在交通研究中收集轨迹数据至关重要.
  • 由于视频处理的局限性,现有的轨迹数据往往受到不可靠性,不准确性或不完整性的影响.
  • 缺乏经过审查的轨迹数据集阻碍了研究界的进步.

研究的目的:

  • 解决在运输研究中对可靠和验证轨迹数据集的关键需求.
  • 提出和评估一种新的深度学习方法,以提高轨迹数据的准确性和可靠性.
  • 将下一代模拟 (NGSIM) 高速公路数据集改进为可靠的资源.

主要方法:

  • 引入时空地图 (STMaps) 方法用于轨迹数据验证.
  • 开发了一个深度时空嵌入模型,利用对比学习框架在STMaps上进行轨迹实例细分.
  • 在像素和实例层面使用平价约束来指导神经网络学习嵌入空间.
  • 重建和验证了NGSIM高速公路数据集与手动处理的地面真相.

主要成果:

  • 深度时空嵌入模型在轨迹实例细分方面表现出增强的性能.
  • 经过验证的NGSIM数据集得到了改进,确保无错误的数据用于研究目的.
  • 对汽车追踪行为,车道更改频率,一致性和冲动值的分析证实了数据的可靠性.

结论:

  • 提出的深度学习方法有效地提高了基于视频的轨迹数据的准确性和可靠性.
  • 精细的NGSIM数据集作为交通研究的可靠资源,促进对驾驶行为的研究.
  • 这项工作建立了一个强大的方法论,用于验证和改进轨迹数据集,这对智能交通系统至关重要.