In order to realize rapid measurement on large dimension object in industrial fields

a new measurement system based on Stereo Vision was proposed and implemented. The system employing several CCD as vision sensors obtains pictures of the object from deferent viewing positions

finds out 2D coordinates of the points in each pictures

then calculates their 3D coordinates based on the method of intersection. Global reference points are inspected by Multi-View Stereo Vision system: a high-resolution CCD camera is used to take a group of pictures surrounding the object

after analyzing the obtained 2D parallax pictures

the measurement software carries out 3D reconstruction of the global references points. Local area dense points is inspected by Binocular Stereo System:

after focusing the measurement head to given area object

projecting the coded stripe on the surface

meanwhile capture pictures from the left and right CCD camera synchronously

the measurement software automatic carry out the stereo matching

reconstruction

result in local area dense points clouds. Also

software transforms the local dense points clouds to the global reference points coordinates system

according to the relation between local reference points and global reference points. Experiment show that the new system is capable of meeting precision and efficiency demand of large dimension measurement.