3D measurement of large steel plates based on the integration of computer vision and laser technology
In order to measure large-scale steel plates accurately,this paper presents a 3D measurement method which combines laser and computer vision technique,and performs detail researches of key techniques,such as extracting laser markers,constructing error field and error correcting.In this paper,we measure steel plates by using optical scanner and laser total station.The concrete steps of the proposed method are as follows.Firstly,an optical scanner is used to obtain dense 3D data of a steel plate,and a laser total station is used to measure some laser markers which are adopted to correct the result;Secondly,we measure the laser markers by using the optical scanner;Thirdly,we construct an error field using the difference between the markers' coordinates measured by scanner and laser,respectively;Finally,the constructed error field is used to correct the result measured by the scanner to acquire accurate and dense 3D data.The experimental results show that the accuracy increases by about 100％ by using the combined method compared with the result measured only by a scanner,and the measurement speed of the combined method is nearly the same as that of computer vision methods,which can satisfy the need of large-scale measurement in industry.
computer visionlaserthree-dimensional (3D)measurementerror field
NETL
NSTL
万方数据
维普
