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Phase-shifting profilometry combined with Gray-code patterns projection: unwrapping error removal by an adaptive
Optics Express
|April 7, 2017
Summary
This study introduces an adaptive median filter to fix 3D measurement errors in phase-shifting profilometry. The method effectively removes phase unwrapping errors while preserving step-heights in complex objects.
Area of Science:
- Optics
- Metrology
- Computer Vision
Background:
- Phase-shifting profilometry with Gray-code projection is a standard 3D measurement technique.
- Phase unwrapping errors occur due to non-binary captured patterns, especially with objects featuring step-heights and invalid pixels.
Purpose of the Study:
- To develop an effective method for removing phase unwrapping errors.
- To preserve step-heights during 3D measurement of complex objects.
Main Methods:
- Phase-shifting profilometry with Gray-code pattern projection.
- Application of an adaptive median filter to correct phase unwrapping errors.
- Validation through simulations and experimental measurements.
Main Results:
- The proposed adaptive median filter effectively removes phase unwrapping errors.
- Step-heights of measured objects are preserved.
- The method demonstrates robustness in challenging measurement scenarios.
Conclusions:
- The adaptive median filter provides an effective solution for phase unwrapping errors in 3D profilometry.
- This technique enhances the accuracy of 3D measurements for objects with step-heights.