Stereo Vision Matching for Position and Orientation Recognition of Parts on Intelligent CMMs

In order to improve the efficiency and accuracy of position and orientation recognization of parts on Three-coordinate measuring machines(CMM),a new method of stereo vision matching on the basis of displacement of image centroid is proposed.The CCD camera is fixed on the Z axis of CMM,and single camera stereo vision system is composed.Taking full advantage of the precision movement of CMM,real-time images of the part to be mesured are captured on two different positions,and two image centroids are acquired by image processing.The offset distance between two centroids is used as a restriction to accomplish stereo vision matching.The above method avoids using some complicated restriction such as epipolar constraint and gray constraint.The experimental results show this method is of high pitching precision,and the image pitching time of the measured part is 1.818 s.