Stereo vision uses two images taken from two angles to recover the three-dimensional information of the measured object without scanning. This method is suitable for the application of dynamic measurement. The main techniques used in this method are epipolar geometry and geometric optics. In camera imaging geometry, a three-dimensional point corresponds to the only point in the image, but a point in the image corresponds to multiple three-dimensional space points. Therefore, we need to use stereo matching method to determine the specific matching point.