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Absolute three-dimensional shape measurement with a known object.

Junfei Dai, Yatong An, Song Zhang

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    |May 5, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new 3D shape measurement technique using a ping-pong ball for absolute phase unwrapping, eliminating the need for traditional temporal methods. This approach requires only three fringe patterns for accurate 3D shape reconstruction.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Absolute three-dimensional (3D) shape measurement is crucial in various fields.
    • Conventional temporal phase unwrapping methods can be complex and time-consuming.
    • There is a need for simpler, more efficient 3D measurement techniques.

    Purpose of the Study:

    • To present a novel method for absolute 3D shape measurement.
    • To eliminate the requirement for conventional temporal phase unwrapping.
    • To utilize a known object for phase unwrapping cues.

    Main Methods:

    • A ping-pong ball is used as a known object to provide cues for absolute phase unwrapping.
    • The ping-pong ball is segmented, and its phase is spatially unwrapped.
    • The nearest point on the ball determines zmin, establishing a minimum phase (Φmin) for scene phase unwrapping.
    • Phase unwrapping of the entire scene is performed pixel by pixel using Φmin.

    Main Results:

    • The proposed method successfully performs absolute 3D shape measurement without temporal phase unwrapping.
    • Only three phase-shifted fringe patterns are needed for the measurement.
    • Accurate absolute shapes of objects moving in the z-direction were measured.

    Conclusions:

    • The novel method offers a simplified and efficient approach to absolute 3D shape measurement.
    • The use of a known object (ping-pong ball) effectively replaces complex temporal unwrapping.
    • This technique is suitable for dynamic scenes with objects moving along the depth axis.