Toward high accuracy measurements in structured light systems

Raul Vargas; Lenny A. Romero; Song Zhang; Andres G. Marrugo

doi:10.1117/12.2618922

31 May 2022 Toward high accuracy measurements in structured light systems

Raul Vargas, Lenny A. Romero, Song Zhang, Andres G. Marrugo

Proceedings Volume 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI; 120980A (2022) https://doi.org/10.1117/12.2618922
Event: SPIE Defense + Commercial Sensing, 2022, Orlando, Florida, United States

Abstract

In structured-light systems, the lens distortions of the camera and the projector reduce the measurement accuracy when calibrated as a standard stereo-vision system. The conventional compensation via distortion coefficients reduces the error, but still leaves a significant residual. Recently, we proposed a hybrid calibration procedure that leverages the standard calibration approach to improve measurement accuracy. This hybrid procedure consisted of building a pixel-wise phase-to-coordinate mapping based on adjusted 3D data obtained from the standard stereo-vision method. Here, we show experimentally that the measurement accuracy can be significantly improved, even using the linear pinhole model and linear mapping functions. We then move to consider the nonlinear model to improve the measurement accuracy further. Encouraging results show that this new calibration method increases the measurement accuracy without requiring elaborate calibration procedures or sophisticated ancillary equipment.

Conference Presentation

Citation Download Citation

Raul Vargas, Lenny A. Romero, Song Zhang, and Andres G. Marrugo "Toward high accuracy measurements in structured light systems", Proc. SPIE 12098, Dimensional Optical Metrology and Inspection for Practical Applications XI, 120980A (31 May 2022); https://doi.org/10.1117/12.2618922

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