An Improved Calibration Method for Optical 3D Measuring System Using Cross Target Based on Bundle Adjustment Algorithm

Abstract:

This paper presents an accurate calibration method of binocular 3D measurement systems for industrial on-site inspection, which uses a cross target with ring coded points. The cross target can be used to calibrate large-scale field-of-view stereo measurement systems and obtain higher measurement precision conveniently. The world coordinates of these ring coded points are not required. The calibration initial value is computed by using the relative orientation method and the Direct Linear Transform (DLT) method of photogrammetry. The bundle adjustment algorithm is used to optimize the calibration parameters as well as the 3D coordinates of the ring coded points. Experiment results show that the RMS error of the reprojection in our method is less than 0.05 pixels and the measurement error is 0.011 mm compared with the Coordinate Measuring Machine (CMM).

• Periodical: Advanced Materials Research (Volumes 97-101)
• Pages: 4237-4242
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.97-101.4237
• Online since: March 2010
• Authors: Zhen Zhong Xiao, Jin Liang, De Hong Yu, Zheng Zong Tang
• Keywords: Binocular Stereo System, Bundle Adjustment, Camera Calibration, Cross Target

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