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相关概念视频

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

451
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...
451
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

536
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...
536
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

273
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...
273
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

436
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...
436
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

398
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. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
398
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

430
A slider-crank mechanism 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. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
430

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相关实验视频

Updated: Sep 13, 2025

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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从使用定向物体检测的空中记录中提取一致的车辆轨迹.

Kevin Riehl1, Shaimaa K El-Baklish2, Anastasios Kouvelas2

  • 1Traffic Engineering Group, Institute for Transport Planning and Systems, ETH Zurich, Stefano-Franscini-Platz 5, 8093, Zurich, Switzerland. kriehl@ethz.ch.

Scientific reports
|July 29, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的方法,可以利用角度信息从空中视频中提取车辆轨迹. 这种方法提高了轨迹的准确性和一致性,增强了流量分析.

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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:

  • 计算机视觉 计算机视觉
  • 运输工程 运输工程
  • 人工智能的人工智能

背景情况:

  • 从空中视频中提取车辆轨迹对于交通分析至关重要.
  • 目前使用水平界限框的方法与旋转的车辆和密集的交通扎.
  • 使用神经网络进行对象检测是轨迹提取的关键组成部分.

研究的目的:

  • 提出一个可通用的计算管道,从空中视频中提取高质量的车辆轨迹.
  • 为了利用角度信息和定向物体检测来提高轨迹的准确性.
  • 为了提高交通研究重建轨迹的物理一致性和可用性.

主要方法:

  • 开发了一个计算管道,利用角度信息来提取轨迹.
  • 设计了一种基于车辆和驾驶员的轨迹重建算法.
  • 在现实世界的视频数据集上评估了18个物体检测模型.

主要成果:

  • 定向物体检测显著提高了轨迹的一致性 (15%内部,20%排队).
  • 角度信息提高了用笛卡尔坐标和车道坐标重建的轨迹质量.
  • 重建的轨迹更好地捕捉汽车跟踪和交通动态.

结论:

  • 拟议的管道比传统的车辆轨迹提取方法有了显著的改进.
  • 利用角度信息和定向物体检测可以提高交通分析的准确性和一致性.
  • 增强的轨迹提高了详细的交通流量研究和了解车辆动态的可用性.