Research On Line Structure Light Three Dimensional Reconstruction In Metal 3D Printing

With the development of science and technology,traditional measurement methods can no longer meet the needs of people’s life and production.Monocular vision measurement based on structured light has received more and more attention in recent years due to its advantages of non-contact,fast measurement speed and high precision.And plastic 3D printing technology has matured,metal 3D printing has gradually entered people’s field of vision,but the nature of metal materials has led to make progress of this technology slow,and this design can form a closed-loop system with metal 3D printing,after three-dimensional measurement,Printing again and again until the metal 3D printing effect is achieved.The innovation of this paper lies in the breakthrough application of line-structured light technology in machine vision to metal 3D printing in aerospace.Link machine vision to metal 3D printing technology.Inter-grounding applies machine vision to the aerospace industry.In the paper,the relative position of the camera and laser generator remains unchanged and placed on a one-dimensional transmission platform,which is displaced relative to the fixed object to be measured.The line laser projects the line structure light onto the surface of the object,each movement.In one position,the camera captures an image and performs a three-dimensional scan of the object.Based on the three-dimensional visual reconstruction of line structure light,the design of the 3D reconstruction program of metal 3D printing model is mainly expounded.This design uses line structure light and passive scanning based on a monocular camera.The design is mainly composed of three parts.The first is the calibration of the line structure optical reconstruction system,including camera calibration,light plane calibration and moving pose calibration,then the acquisition of the line structure light image and the extraction of the optical center image.Finally,The three-dimensional reconstruction of the optical center image is performed to form a point cloud image.Based on the above experimental background,the structural model of the device is constructed firstly.A three-dimensional reconstruction system based on line structure optical monocular camera is realized.The surface of the object is scanned by laser and camera moving relative to the object.The principle of the line structure light measurement system and the factors affecting the accuracy of 3D reconstruction in the system are analyzed.For the camera calibration,the calibration of the camera itself,the calibration of the line structure light plane and the moving pose are performed by the traditional calibration algorithm.The effects of radial distortion and tangential distortion of the camera were analyzed to complete the calibration of the system.Then the processed image is processed.The image processing in this paper is mainly divided into three parts,filtering processing,ROI extraction,and gray center of gravity extraction.Finally,the 3D reconstruction is completed by the surface reconstruction method.Through the processing of the optical center image,the uncalibrated map,the already scaled x,y,z map and the calibrated whole image can be extracted through these five images.You can find the 3D model of the image.It is believed that with the development of technology,machine vision technology and 3D printing technology can be more closely linked to promote industrial development.