Improved calibration method of binocular vision measurement system for large hot forging

Binocular vision measurement technology is widely used in large object measurement, such as large hot forging. However, the traditional method cannot satisfy the requirement of the binocular measurement system in the workshop, which is complex and fast-paced processing. Therefore, an improved binocular measurement system for large hot forging calibration method is proposed in this paper. The binocular measurement system in the severe workshop can be calibrated accurately by the proposed method. A stepwise accurate intrinsic parameter calibration method based on active vision is present. The strong coupling of these intrinsic parameters is eliminated. Besides an accurate global optimization method with multiple restrictions is presented in this paper. The calibration accuracy is further improved. The proposed method is applied for the binocular measurement system for large hot forging in the workshop. The experiment result shows that the proposed method is effective and the accuracy of the proposed method can reach 0.52%.