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相关概念视频

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

448
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...
448
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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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...
214
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

389
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...
389
Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

322
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...
322
Planar Rigid-Body Motion01:22

Planar Rigid-Body Motion

411
Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
Planar motion is typically divided into three distinct categories. The first is rectilinear translation, demonstrated by a subway train that moves along...
411
Motion of a Projectile01:23

Motion of a Projectile

708
Projectile motion becomes evident when a player kicks the ball into the air. The launch angle, or the angle at which the ball is kicked, plays a crucial role in determining the trajectory of the projectile. As the ball soars through the air, influenced solely by gravity, its motion can be dissected into two independent velocity components: the horizontal and the vertical.
Horizontal motion, governed by the initial kick, maintains a constant velocity throughout the flight of the soccer ball.
708

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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
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对于轴向移动的目标来说,移动模糊的幽灵成像.

Long Zhang, Jianzhong Liu, Wenlin Gong

    Optics letters
    |December 13, 2024
    PubMed
    概括

    这项研究引入了一种新的移动模糊鬼影像 (GI) 系统,使用伪热光来保持高分辨率,尽管轴向运动. 该系统在没有运动估计的情况下实现清晰的图像,增强移动目标检测能力.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 图像处理 图像处理

    背景情况:

    • 使用热光无镜头幽灵成像 (GI) 由于轴向运动和可变放大而导致图像模糊.
    • 在焦点深度 (DOF) 内的轴运动可以降低传统GI系统中的分辨率.

    研究的目的:

    • 开发一种能够克服轴向运动引起的分辨率降解的运动模糊消化系统.
    • 为了实现高分辨率的GI,而不需要事先的运动估计信息.

    主要方法:

    • 提出了一种使用伪热光的新型幽灵成像系统.
    • 研究了轴运动和系统DOF对图像分辨率的影响.
    • 优化了旋转磨砂玻璃盘 (RGGD) 上激光点的几何形状,以扩展DOF.

    主要成果:

    • 证明高分辨率GI是可以实现的,只要目标的随机运动范围在系统的DOF内.
    • 分析和实验结果证实了该系统在消除受轴运动影响的图像模糊性的有效性.
    • 展示了通过RGGD激光点优化来扩展系统的DOF的能力.

    结论:

    • 拟议的移动模糊GI系统有效地克服了轴向运动导致的分辨率降低.
    • 这种技术增强了GI在移动目标检测和识别方面的实际应用.

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  • 该系统提供高分辨率的成像,没有事先的运动估计,简化了实际实施.