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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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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.
Here, in order to determine the magnitude of velocity and acceleration for point...
667

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Closed-loop solution method of active vision reconstruction via a 3D reference and an external camera.

Guan Xu, Fang Chen, Xiaotao Li

    Applied Optics
    |November 2, 2019
    PubMed
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    This study presents a flexible 3D reconstruction method for 3D profile measurement and optical inspection. The approach enhances flexibility by enabling observation of occluded object locations using active vision systems.

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    Area of Science:

    • Computer Vision
    • Metrology
    • Optical Engineering

    Background:

    • Laser-plane-based vision reconstruction is crucial for 3D profile measurement and optical inspection.
    • Existing methods often have position constraints for active vision systems.

    Purpose of the Study:

    • To develop a flexible 3D reconstruction method for object measurement.
    • To overcome position constraints in active vision systems.

    Main Methods:

    • Utilized a closed-loop system involving an external camera, a 3D reference with an internal camera and laser projector, and a 3D calibration object.
    • Determined intrinsic invariants of the 3D reference through two closed loops.
    • Employed a cubic LED reference and a monocular external camera to cancel position constraints.

    Main Results:

    • Successfully demonstrated a flexible 3D reconstruction method.
    • The system allows observation of occluded locations on the measured object due to the external camera focusing on the 3D reference.
    • Experimental verification of the calibration and reconstruction models.

    Conclusions:

    • The developed method offers a flexible approach to 3D reconstruction for measurement and inspection.
    • The technique effectively removes position constraints for active vision systems.
    • Validated experimental results indicate potential for broad applications in optical inspection.