Ms. Yuxin Tang Profile

Yuxin Tang

at XIOPM CAS

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Proceedings Article | 10 September 2022 Paper

Calibration of the projector in structured light systems using Brox optical flow

Hua Zhang, Yuxin Tang, Ping Sun, Nan Shao

Proceedings Volume 12328, 123280D (2022) https://doi.org/10.1117/12.2644205

KEYWORDS: Calibration, Projection systems, Cameras, Optical flow, Structured light, Fringe analysis, Distortion, Image processing

Read Abstract +

In this work, we propose a new calibration technique for locating the projector in the structured light measurement system. Using Brox optical flow, the estimation of three coordinate components of the projector only requires two images captured before and after the motion of the calibration plate. The calibration principle presented on geometry depicts the relation between the position of the projector and that of the camera, to the optical flow caused by the movement of the calibration plate. The accuracy of the proposed method is verified by numerical simulation. The measurement system is calibrated by using the proposed calibration method and by Falcao’s method simultaneously for comparison. After calibration, eight-step phase shift technique of a recognized high precision is performed to reconstruct the 3-D shape. The results show that the height distribution of the specimens is in good agreement with its true values, and the maximum absolute error is less than 0.1 mm.

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