Vol. 145, No. 10, September 2012, pp. 119-129

Abstract: 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.

Keywords: Large forging, High temperature, Calibration, Visual measurement

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