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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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High-accuracy projector calibration method for fringe projection profilometry considering perspective transformation.

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    This study introduces a new method for calibrating Digital Light Processing (DLP) projectors used in 3-D measurements. The technique improves accuracy by minimizing perspective errors during structured light calibration.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Digital Light Processing (DLP) projectors are crucial for structured light 3-D measurements.
    • Accurate calibration of DLP projectors remains a significant challenge in 3-D metrology.

    Purpose of the Study:

    • To propose a novel and accurate projector calibration method for Digital Light Processing (DLP) projectors.
    • To enhance the precision of 3-D measurements by improving projector calibration.

    Main Methods:

    • A novel calibration method is proposed by fixing the camera and calibration board to eliminate perspective transformation errors.
    • The method involves capturing images with fringe patterns projected at various positions and orientations.
    • A one-to-one correspondence is established using phase equivalence for accurate projector calibration.

    Main Results:

    • The proposed method effectively eliminates perspective transformation errors.
    • It avoids distortions in extracted marker points, ensuring higher calibration accuracy.
    • Experimental results demonstrate the feasibility and ease of operation of the new calibration technique.

    Conclusions:

    • The developed projector calibration method offers competitive accuracy for 3-D measurements.
    • This approach simplifies the calibration process while enhancing precision.
    • The technique is suitable for applications requiring high-accuracy 3-D structured light measurements.