Cross-point calibration method for the Scheimpflug measurement system

Abstract

The Scheimpflug measurement system has broad application prospects in the fields of tomographic particle image velocimetry (PIV), ophthalmology, and three-dimensional reconstruction. Additionally, its special imaging structure makes the theoretical model of other traditional calibration methods no longer applicable. A cross-point calibration method in which the real-world coordinate system is transferred from an in-kind calibrator to displacement, achieving great improvements in the quantity and accuracy of the feature points, is proposed. This method, which makes up for the defects introduced by the distorted imaging plane, also in turn simplifies the calibration process. Finally, the proposed method is tested via both simulation and calibration experiments. The high calibration accuracy verifies that the method is feasible.

High-Precision 3D Reconstruction for Small-to-Medium-Sized Objects Utilizing Line-Structured Light Scanning: A Review

“…The calibrator adopted by these methods does not limit the processing accuracy, which completely resolves the drawbacks of the physical calibration method. Meanwhile, this method can achieve a minimal movement interval to obtain dense datasets compared with others to achieve higher accuracy than traditional calibration methods [14].…”