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Hilbert transform-based crosstalk compensation for color fringe projection profilometry.

Yuwei Wang, Lu Liu, Jun Wu

    Optics Letters
    |April 15, 2020
    PubMed
    Summary

    This study introduces a novel crosstalk compensation technique for color fringe projection profilometry. The method effectively reduces phase errors, enhancing the accuracy of 3D reconstructions.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Computer Vision

    Background:

    • Color fringe projection profilometry is a key technique for 3D surface measurement.
    • Crosstalk between color channels introduces phase errors, degrading measurement accuracy.
    • Existing compensation methods often struggle with complex crosstalk patterns.

    Purpose of the Study:

    • To develop an effective method for compensating crosstalk-induced phase errors in color fringe projection profilometry.
    • To improve the accuracy of three-dimensional (3D) reconstruction using this technique.
    • To validate the proposed method through simulations and experimental verification.

    Main Methods:

    • Analyzing the effect of crosstalk on color fringe frequency.
    • Applying the Hilbert transform to color fringe patterns to introduce a phase shift.
    • Recovering two phase maps from normalized and transformed patterns.
    • Averaging the two phase maps for final 3D reconstruction.

    Main Results:

    • The crosstalk-induced phase error was found to double the frequency of the color fringe.
    • The Hilbert transform effectively shifts the carried phase by π/2.
    • The proposed method significantly suppresses crosstalk-induced phase errors.
    • Simulations and experiments demonstrated improved measurement accuracy.

    Conclusions:

    • The developed crosstalk compensation method is effective for color fringe projection profilometry.
    • The technique enhances 3D reconstruction accuracy by mitigating phase errors.
    • This approach offers a robust solution for precise 3D metrology in the presence of crosstalk.