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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.
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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.
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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Semi-Global Matching Assisted Absolute Phase Unwrapping.

Yi-Hong Liao1, Song Zhang1

  • 1School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.

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|January 8, 2023
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Summary

This study introduces a novel absolute phase unwrapping method for high-speed 3D shape measurement. It uses three speckle patterns to quickly and accurately capture dynamic scenes, reducing motion artifacts.

Keywords:
3D reconstructionSemi-Global Matchingdigital image correlationhigh speedphase unwrappingphase-shifting

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • Dynamic scene capture requires fast measurement speeds to minimize motion artifacts.
  • Phase-shifting methods offer high accuracy and dense 3D point clouds but are limited by phase unwrapping speed.
  • Existing methods struggle with high-speed 3D shape measurement of dynamic scenes.

Purpose of the Study:

  • To develop a high-speed absolute phase unwrapping method for 3D shape measurement.
  • To enable accurate dynamic scene capture using a single-camera, single-projector structured light system.
  • To reduce motion artifacts in 3D measurements by increasing speed.

Main Methods:

  • Utilized a single-camera, single-projector structured light system.
  • Employed three speckle-embedded phase-shifted patterns for data acquisition.
  • Applied the Semi-Global Matching (SGM) algorithm for coarse correspondence.
  • Developed a computational framework for pixel-by-pixel fringe order determination.

Main Results:

  • Achieved high-speed 3D shape measurement using only three phase-shifted patterns.
  • Successfully obtained wrapped phase from speckle-embedded patterns.
  • Established coarse correspondence between object and reference images using SGM.
  • Demonstrated high-quality 3D measurements of complex scenes in experiments.

Conclusions:

  • The proposed absolute phase unwrapping method significantly enhances measurement speed.
  • The technique effectively reduces motion artifacts in dynamic scene capture.
  • This approach offers a viable solution for high-speed, high-quality 3D shape measurement.