Abstract:  In order to improve the accuracy and precision of binocular stereo vision device，a calibration
technology based on binocular stereo vision is proposed． According to the characteristics of two cameras in
binocular stereo vision，using the calibration plate of circular symbol array as the image source，through the
preprocessing of the image，under the constraint of radial error，the method of extracting feature points by using
geometric relation of circle and least square data processing is used to obtain coordinate of identification point and
homography matrix of image． The ideal external and internal parameters are inferred． The accurate parameters of
binocular stereo vision device are obtained． This test provides accurate data basis and reliable correction
conditions for the device to acquire measured data．

Key words: binocular stereoscopic vision, calibration technique, geometrical relationship, least square method