Global calibration method for multi-vision measurement system with coplanar targets

A unique world coordinate based global calibration method with coplanar targets was proposed. By taking a laser tracker to establish the general measurement coordinate frame and by fitting the standard plane to set up the calibration points, the system was used to acquire the images of the calibration points for each camera in the multi-vision inspection system, then, all the cameras in the measurement system can finish global calibration without medi-coordinate-frames, the accuracy loss from transformation times of coordinates frame was decreased. Finally, the global calibration experiment on a real aircraft attitude measurement system was carried out by the high speed multi-cameras. The experimental results show that the root mean square error of the system is not more than 0.8 mm under the condition of large measurement range, which indicates that the calibrations process is facilitated and can satisfy the requirements of higher precision systems.