Application of machine vision for geometric dimensions measurement

Abstract

A machine vision system with high precision and easy operation was designed to measure the position, height, and verticality of an automobile part which were very difficult by traditional inspection methods. It consisted of two cameras, two lights, and one embedded image processing unit DMV1000. After being carefully calibrated, the system performed well with the maximum distance absolute error of about 0.02 mm and angle absolute error of 0.26°. Combined with server motor system and pneumatic system, all measuring procedures automatically worked after one start button push. In this paper, the hardware and software designs of this system were introduced in detail and the verification test data were discussed which proved the high stability and precision of this equipment.