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Projector recalibration of three-dimensional profilometry system.

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Projector calibration errors in 3D profilometry cause scale deviations. A new recalibration method using a binocular system significantly enhances measurement accuracy from 1.0 mm to 0.10 mm.

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Area of Science:

Optics and Metrology
Computer Vision
3D Measurement Systems

Background:

Monocular 3D profilometry systems using projectors and cameras are susceptible to projector calibration errors.
These errors, specifically in principal point and focal length, introduce scale transformations in measurements, which are undetectable by standard reprojection methods.

Purpose of the Study:

To address the limitations of monocular 3D profilometry systems.
To propose and validate a systematic recalibration method for correcting projector principal point and focal length errors.

Main Methods:

Analysis of projector calibration errors (principal point, focal length) and their impact on 3D measurement deviation.
Development of a systematic recalibration procedure utilizing an accurate binocular 3D measurement system.
Experimental validation of the proposed recalibration method.

Main Results:

Projector calibration errors were found to introduce unrevealed scale transformations in 3D measurements.
The proposed systematic recalibration method effectively corrects these errors.
The 3D measurement accuracy of the monocular system improved significantly, from approximately 1.0 mm to 0.10 mm.

Conclusions:

The developed recalibration method enhances the reliability and accuracy of monocular 3D profilometry.
Accurate projector calibration is crucial for precise 3D measurements, especially in applications sensitive to scale deviations.