Low Cost 3-Dimentional Measurement System With Machine Vision And It's Application Research In Reverse Engineering

The design level and manufacturing efficiency of the product can be promoted by using the conception of reverse engineering and the advanced design method. So it is important to study the key technology of reverse engineering and develop a low cost, practical 3-d measuring system. This paper will research the 3-d measuring system based on machine vision and its application in the reverse engineering.The main topics of this thesis are as follows: a straightaway-displacement measuring system based on 3-d machine vision used in reverse engineering has been developed, and some important problems during realizing the system have been researched including the achievement of continuous equal interval sampling and the processing method of digital image; and the measuring data is previewed by means of the 3-d reconstruction technology. At the same time, the original turning measurement system is improved. This work mainly focuses on the implement of the calibration method of axes. The disadvantage of which based on the method of seeking points of intersection is discussed, In order to resolve this problem, the strategy of error compensation is put forward, which realizes the accurate calibration of axes. It provides exact data source for the reverse engineering system. Then the data is pre-processed and output as files which can be read into UG. The model is created and modified in UG. At last, the whole process is accomplished through measuring a sample by means of the two measuring systems. The experiment result indicates that the measuring system developed can be used for reverse engineering.