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Related Concept Videos

Inertial Frames of Reference01:03

Inertial Frames of Reference

Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with constant...
Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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 instrumental in...
Non-inertial Frames of Reference01:27

Non-inertial Frames of Reference

A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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 drone...
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

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...
One-Degree-of-Freedom System01:24

One-Degree-of-Freedom System

In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...

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Related Experiment Video

Updated: May 28, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Fringe inverse videogrammetry based on global pose estimation.

Yong-Liang Xiao1, Xianyu Su, Wenjing Chen

  • 1Department of Opto-Electronics Science and Technology, Sichuan University, Chengdu 610065, China.

Applied Optics
|October 22, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces fringe inverse videogrammetry for precise 3D coordinate measurement. The novel method uses global pose estimation for accurate results in various applications.

Related Experiment Videos

Last Updated: May 28, 2026

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
11:34

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Published on: December 3, 2013

Area of Science:

  • * Engineering and Applied Physics
  • * Metrology and Measurement Science

Background:

  • * Accurate three-dimensional (3D) coordinate measurement is crucial in many scientific and industrial fields.
  • * Existing methods often face challenges with precision, global convergence, or complexity.

Purpose of the Study:

  • * To present a novel fringe inverse videogrammetry technique for precise 3D coordinate measurement.
  • * To demonstrate the effectiveness of global pose estimation over local methods.

Main Methods:

  • * Utilized an LCD screen for fringe projection, a microcamera-equipped tactile probe, and a personal computer.
  • * Employed Fourier fringe analysis for subpixel location of reference points.
  • * Implemented a convex-relaxation optimization algorithm for global camera pose estimation.

Main Results:

  • * Successfully calculated the 3D coordinate of the probe tip using microcamera pose.
  • * The convex-relaxation algorithm ensured global convergence, outperforming local methods like bundle adjustment.
  • * Experimental results confirmed the high precision of the fringe inverse videogrammetry method.

Conclusions:

  • * Fringe inverse videogrammetry provides a precise and robust method for 3D coordinate measurement.
  • * Global pose estimation is a key factor in achieving accurate and reliable measurements.
  • * The technique has potential applications in fields requiring accurate spatial metrology.