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Accurate projector calibration method by using an optical coaxial camera.

Shujun Huang, Lili Xie, Zhangying Wang

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    |May 14, 2015
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method for calibrating digital light processing (DLP) projectors using an optical coaxial camera. This approach accurately determines internal projector parameters for improved 3D imaging.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Digital light processing (DLP) projectors are crucial for 3D imaging, projecting structured-light patterns.
    • Accurate 3D data relies on precise calibration of DLP projector internal parameters.
    • Current calibration methods often suffer from complexity or low accuracy.

    Purpose of the Study:

    • To present a novel, accurate method for calibrating DLP projectors.
    • To overcome limitations of existing calibration techniques.
    • To enable more precise 3D shape data acquisition.

    Main Methods:

    • Utilized an optical coaxial camera system with a plate beam splitter, enabling the projector to act as an inverse camera.
    • Employed a calibration plate with discrete markers.
    • Projected sinusoidal fringe patterns to determine marker coordinates via absolute phase calculation.

    Main Results:

    • Successfully calibrated DLP projector internal parameters using the proposed optical coaxial method.
    • Demonstrated high accuracy in obtaining projector parameters.
    • Experimental validation confirmed the method's effectiveness.

    Conclusions:

    • The novel optical coaxial camera method provides accurate calibration of DLP projector internal parameters.
    • This technique offers a more precise approach for 3D imaging applications.
    • The method simplifies the calibration process compared to existing techniques.