The Research Of 3d Vision Measurement Method Based On Line Laser Rotating Scanning

With the continuous development of automation,mechanical and photoelectric field,threedimensional measurement technology become a focus in the study of engineering.At the same time,three-dimensional measurement system is moving forward in the direction of automation,precision and portability.The three-dimensional measurement method based on line laser rotation scan has strong antiinterference ability,reliable signal processing,large measurement range,high measuring efficiency,simple structure and easy maintenance.The development prospect is very extensive in the field of industrial engineering surveying.The optical visual measurement of linear structure has become an effective measure for measuring object surface shape,location spatial information acquisition and even 3d movement information.This paper designs a three-dimensional vision measurement system based on line laser rotation scan and set up a platform based on rotary platform,camera and laser In combination with c + + and OpenCV library,the three-dimensional reconstruction algorithm based on line laser rotating scanning is studied,mainly completed the camera parameter calibration,calibration of the light plane and the axis of rotation,the three dimensional point cloud dimensions and matching point cloud.This paper introduces the research significance and development of three-dimensional measurement technology in the field of machine vision in the first.Then introduces the research status of the technology.According to the actual design requirements and the precision index,determine the overall design of the three-dimensional measurement system and select the appropriate hardware device and complete the shape design.Then introduces system calibration method.First,calibrate the camera and remove the distortion.Secondly,four-element method is introduced to calibrate the relationship between the axis and the camera.In addition,the control software is designed and implemented to obtain photos automatically.Based on the characteristics of line laser stripe,the laser light bar is processed by denoising,extracting and refining the area of interest and improve he refine algorithm.Then the center extraction of laser light bar and the fitting scheme of optical plane equation are given,and the accuracy is verified.The acquisition algorithm of three-dimensional point cloud coordinates is studied and the ICP algorithm for point cloud matching is improved.The point cloud data obtained from different perspectives is unified into the same coordinate system.Then obtain the complete point cloud data for the object to be tested and verify the improved algorithm.Using the Delaunay triangulation algorithm to construct the plane to get a clear,smooth outline of the object.Finally,using the measuring system to perform a contour recovery and a three-dimensional measuring experiment,to verify that the accuracy of the three-dimensional measurement system designed in this paper can meet the expected target.The experiment proved that the system can obtain the point cloud information of the object by rotating the laser scan and the geometrical shape of the visible surface of the object is restored visually.The feasibility and effectiveness of the system are verified.