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Related Concept Videos

Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

433
In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
433
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

582
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...
582
Kinematic Equations - II01:17

Kinematic Equations - II

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The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
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Kinematic Equations - III01:18

Kinematic Equations - III

9.2K
The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
9.2K
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

472
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...
472
Kinematic Equations - I01:26

Kinematic Equations - I

12.8K
When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
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Related Experiment Video

Updated: Oct 9, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping

Published on: April 21, 2023

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Orientation Keypoints for 6D Human Pose Estimation.

Martin Fisch, Ronald Clark

    IEEE Transactions on Pattern Analysis and Machine Intelligence
    |December 16, 2021
    PubMed
    Summary

    This study introduces orientation keypoints for estimating full skeletal joint rotation from single RGB images. This novel approach enhances accuracy in human pose estimation for applications like sports analysis and animation.

    Area of Science:

    • Computer Vision
    • Machine Learning
    • Human Pose Estimation

    Background:

    • Current human pose estimation methods primarily detect joint positions, enabling yaw and pitch calculation.
    • The roll (rotational twist) along limbs, crucial for sports analysis and animation, remains unobserved in existing approaches.

    Purpose of the Study:

    • To introduce a novel method for estimating the full position and rotation of skeletal joints from single-frame RGB images.
    • To address the limitation of unobserved limb roll in current pose estimation techniques.

    Main Methods:

    • The proposed method utilizes 'orientation keypoints' inspired by motion capture systems.
    • Virtual markers are employed to generate sufficient data for inferring joint rotations.
    • Simple post-processing techniques are applied for accurate rotation estimation.

    More Related Videos

    A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
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    In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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    A Methodology for Capturing Joint Visual Attention Using Mobile Eye-Trackers
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    In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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    Main Results:

    • Achieved a 48% improvement in mean error for joint angle predictions compared to prior state-of-the-art.
    • Demonstrated 93% accuracy across 15 distinct bone rotations.
    • Improved joint position estimation by 14% (MPJPE) on the primary dataset and showed good generalization to in-the-wild images.

    Conclusions:

    • The orientation keypoints method enables accurate estimation of full skeletal joint rotation and position from single RGB images.
    • This advancement significantly enhances human pose estimation capabilities, particularly for applications requiring precise limb roll analysis.
    • The method offers a robust solution for complex pose estimation tasks, outperforming existing approaches.