Research On The Key Technologies Of Binocular Stereo Measuring System

The technology for 3D measurement acts as an important role in reverse engineering, industrial inspection, and quality control, etc. The technology for 3D measurement based on computer vision is a non-contact measuring way, which provides a rapid, wide-range, maneuverable measurement method compared to the traditional coordinate measuring machine (CMM). Binocular stereo measuring system, which simulates the eyes of people, is the most frequently used method to implement measuring technology based on vision. Therefore, it is very valuable to build a flexible binocular stereo measuring system. The main work and achievements of this thesis are as follows.1. A hardware platform of binocular stereo measuring system with simple structure was built with low cost, which consists of CCD cameras, lens, a frame grabber card, a computer and a tripod. Besides the hardware configuration, the software framework of the measuring system was also built.2. Calibration techniques were researched systematically in the thesis. It is proposed to use a specifically designed calibration board, theoretically based on Zhang's algorithm, to perform the calibration of binocular stereo measuring system reliably.3. A method for the acquisition of 3D data was implemented by distributing reference points over the objects to be digitized and utilizing the techniques of feature extracting, epipolar rectification, feature matching, and the triangulation principle.4. A prototype of binocular stereo measuring system was built based on the hardware platform, software framework, cameras calibration, and reference points reconstruction, by which some objects were measured to examine the system.The 3D measurement of reference points is significant for surface approximating and reconstruction of objects. The work of this thesis laid foundation for the further work of our project team.