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Stereoscopic deflectometry with a curved screen.

Cheng Liu, Zonghua Zhang, Nan Gao

    Optics Express
    |October 12, 2022
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces stereo deflectometry with a curved screen for enhanced specular surface topography measurement. The novel method improves gradient and height field range, offering high accuracy and stability for complex surface analysis.

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    Area of Science:

    • Optical Metrology
    • Surface Metrology
    • Computer Vision

    Background:

    • Deflectometry is a key technique for specular surface topography measurement.
    • Curved screens in deflectometry expand measurement range compared to plane screens.
    • Stereo deflectometry offers high gradient measurement accuracy, enabling surface reconstruction via integration.

    Purpose of the Study:

    • To propose and validate a stereo deflectometry system utilizing a curved screen.
    • To detail the system calibration and measurement principles for this advanced technique.
    • To enhance the measurement capabilities for specular surface topography.

    Main Methods:

    • Simultaneous calibration of camera parameters and the stereo deflectometric system with a curved screen.
    • Demodulation of rectified fringe patterns to obtain absolute phase maps.
    • Homologous point searching along epipolar lines based on surface normal direction.

    Main Results:

    • Successful simultaneous calibration of the stereo deflectometry system.
    • Accurate demodulation of phase maps and identification of homologous points.
    • Experimental validation demonstrating high accuracy and stability of the proposed method.

    Conclusions:

    • The proposed stereo deflectometry with a curved screen effectively expands measurement range and accuracy.
    • The system calibration and measurement principles are robust for specular surface analysis.
    • This technique provides a stable and accurate solution for complex surface topography reconstruction.