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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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Defocused projection model for phase-shifting profilometry with a large depth range.

Yi Yu, Feipeng Da

|October 7, 2021

Summary

This summary is machine-generated.

This study introduces a new model to improve the accuracy of 3D profilometry, especially for large depth ranges. The method corrects defocus-induced errors for more precise 3D measurements.

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Area of Science:

Optical Metrology
3D Imaging
Computer Vision

Background:

Phase-shifting 3D profilometry often uses defocused projection.
Accuracy issues arise with large depth ranges in defocused projection.
Defocus-induced errors are particularly problematic for complex object shapes.

Purpose of the Study:

To address the accuracy limitations of defocused projection in phase-shifting 3D profilometry.
To develop a novel defocused projection model accounting for object shape.
To enhance measurement accuracy for large depth range applications.

Main Methods:

Pinpointing a new defocus-induced error related to object shape.
Establishing a novel defocused projection model.
Implementing specialized calibration and reconstruction procedures for phase correction.
Analyzing error impact via simulations and experimental verification.

Main Results:

A novel defocused projection model was developed and validated.
The proposed method significantly improves accuracy in phase-shifting 3D profilometry.
Accurate measurement results were obtained even with large depth variations.
Simulations and experiments confirmed the method's feasibility and effectiveness.

Conclusions:

The novel defocused projection model effectively corrects defocus-induced errors.
The method offers improved accuracy for 3D profilometry, particularly in large depth range scenarios.
This approach is expected to provide competitive performance for challenging measurement tasks.