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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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.
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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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In polar coordinates, the motion of a particle follows a curvilinear path. The radial coordinate symbolized as 'r,' extends outward from a fixed origin to the particle, while the angular coordinate, 'θ,' measured in radians, represents the counterclockwise angle between a fixed reference line and the radial line connecting the origin to the particle.
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Related Experiment Video

Updated: Oct 11, 2025

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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Video encryption/compression using compressive coded rotating mirror camera.

Amir Matin1, Xu Wang2

  • 1Institute of Physics and Quantum Science, Heriot Watt University, Third Gait, Currie, Edinburgh, EH14 4AS, UK.

Scientific Reports
|December 1, 2021
PubMed
Summary
This summary is machine-generated.

Compressive coded rotating mirror (CCRM) cameras offer high-speed imaging with advanced data encryption. This novel system achieves significant compression ratios, enhancing security for sensitive data and limited storage applications.

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Area of Science:

  • Optics and Photonics
  • Image Processing
  • Data Security

Background:

  • High-speed imaging systems often face challenges with data storage and transmission.
  • Existing compressive sensing (CS) modalities have limitations in compression ratios and inherent encryption capabilities.

Purpose of the Study:

  • To introduce and evaluate the Compressive Coded Rotating Mirror (CCRM) camera system.
  • To demonstrate the CCRM's capability for high-speed, single-shot image acquisition with superior compression and encryption.

Main Methods:

  • The CCRM camera utilizes amplitude optical encoding and frame sweeping in a passive imaging mode.
  • Data reconstruction is performed using compressive sensing (CS) algorithms with the optical encoder pattern acting as the key.
  • The system's encryption strength is analyzed by assessing data recovery success rates based on encoder pattern similarity.

Main Results:

  • The CCRM camera can reconstruct 1400 frames from a single acquisition, achieving a compression ratio of 368.
  • A high degree of data security is demonstrated, with data recovery being unsuccessful when encoder pattern similarity is below 95%.
  • The system shows high sensitivity, achieving an average Structural Similarity Index (SSIM) of 0.85 at 100% encoder similarity.

Conclusions:

  • The CCRM camera represents a significant advancement in high-speed imaging, offering unparalleled compression and integrated optical encryption.
  • The amplitude encoding method provides a vastly extended key space, making brute-force data recovery highly improbable.
  • CCRM technology is well-suited for applications requiring efficient data handling, high security, and robust encryption, such as sensitive data capture or environments with limited bandwidth.