Virtual binocular stereo vision measurement method without phase unwrapping

Abstract

Binocular stereo vision system faces numerous challenges such as non-strict synchronization between the left and right camera, a substantial amount of image, and time-consuming phase unwrapping process. To address these issues, This paper presents a stereo matching method based on plane mirrors. This method constructs a binocular stereo vision system by employing a real camera and virtual cameras generated by a plane mirror. Using the symmetry of plane mirror as a geometric constraint, we search for symmetrical intervals on the wrapped phase and determine the unique matching points, so as to complete the stereo matching and avoid the phase unwrapping. Compared with traditional method, this method increases the measurement speed and reduces the error caused by non-strict synchronization between the left and right camera. The feasibility is verified by standard stair block and standard sphere, and the experimental results show that the root mean square error is 0.077 mm.