Error analysis in parallel-axes binocular stereoscopic measurement system caused by the calibrated parameters

This paper focuses on the errors in parallel-axes binocular stereoscopic measurement system caused by the calibrated parameters. The Monte-Carlo method was used in simulating and analyzing the errors. In the view of complex algebraic expression of 3D point from the positioning model of binocular vision, according to the independence of imaging-model-parameters, a method of single-parameter analysis of positioning errors was proposed to facilitate the simulation. The simulation results and experiments show that among the intrinsic parameters, the calibration error of the principle point (u0, v0) has a significant influence on the positioning accuracy on the X and Y direction, and the calibration error of focus f_u has an obvious influence on the positioning accuracy on the Z direction. On the other hand, among the extrinsic parameters, both the rotation angle β and the baseline t1 have a visible influence on the positioning accuracies accuracy on all the three directions. The conclusion can be taken as a reference for the design and calibration of binocular vision system.