Accurate phase expansion on reference planes in grating projection profilometry

Zhang, Baofeng; Lin, Yu

doi:10.1088/0957-0233/22/7/075301

Cited by 6 publications

(1 citation statement)

References 15 publications

(17 reference statements)

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“…To avoid phase errors in the checkerboard corners, we used only the phase from the white squares (having morphologically eroded boundaries to avoid black-to-white transition), and we interpolate the phase values using a 5th order 2D polynomial function to all pixels following a similar procedure as described in Ref. [24].…”

Section: B Stereo Vision Calibrationmentioning

confidence: 99%

Hybrid calibration procedure for fringe projection profilometry based on stereo vision and polynomial fitting

et al. 2020

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The key to accurate 3D shape measurement in Fringe Projection Profilometry (FPP) is the proper calibration of the measurement system. Current calibration techniques rely on phase-coordinate mapping (PCM) or back-projection stereo-vision (SV) methods. PCM methods are cumbersome to implement as they require precise positioning of the calibration target relative to the FPP system but produce highly accurate measurements within the calibration volume. SV methods generally do not achieve the same accuracy level. However, the calibration is more flexible in that the calibration target can be arbitrarily positioned. In this work, we propose a hybrid calibration method that leverages the SV calibration approach using a PCM method to achieve higher accuracy. The method has the flexibility of SV methods, is robust to lens distortions, and has a simple relation between the recovered phase and the metric coordinates. Experimental results show that the proposed Hybrid method outperforms the SV method in terms of accuracy and reconstruction time due to its low computational complexity.

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Section: B Stereo Vision Calibrationmentioning

confidence: 99%