A calibration method of binocular vision system for large forging dimension measurement

作者：Liu Wei^*; Ma Xin; Jia Zhenyuan; Wang Wenqiang; Zhang Yang

来源：Sensors and Transducers, 2012, 145(10): 119-129.

• Binocular vision systems
• Calibration method
• Dimension measurements
• Distortion coefficients
• Epipolar constraints
• Field calibration
• High temperature
• LM algorithm
• Measurement precision
• Relative errors
• Traditional calibration
• Visual measurements

Binocular vision system has been employed to measure the large forging dimension, by virtue of the spectrum selective method proposed in our past work. However, under the complicated operation circumstance with high temperature, it is difficult to calibrate the cameras of the binocular vision system by the traditional calibration method. In this paper, a calibration method of binocular vision system is presented for measuring the dimensions of large forging. Moreover, according to the epipolar constraints, the distortion coefficient of two CCD cameras is considered and solved by LM algorithm, for improving the measurement precision of binocular vision system. Experiments on the field calibration in forging workshop are performed, and the results show the relative error of the dimension measurement is less than 0.338 %, which indicates that the proposed calibration method is efficient and effective for calibrating the binocular vision system for large forging dimension measurement in forging workshop.

• 出版日期2012