Research On Three-dimensional Reconstruction System Based On Line Laser

3D Reconstruction technology is one of the important research contents of computer vision.Use the line laser to scan the object to be measured,and calculate the point cloud data of the surface of the object to be measured.Then constructing the obtained point cloud data into a 3D model is a major direction of 3D Reconstruction technology.Line laser scanning reconstruction technology has many applications in reverse engineering,digital archiving of cultural relics and artworks,and defect detection.Therefore,the research and improvement of 3D scanning technology is of great significance.This thesis mainly studies the handheld 3D scanning reconstruction device and method based on multi-line laser.Firstly,this paper analyzes the theoretical basis of the handheld 3D scanning reconstruction system based on multi-line laser.This paper studies the principle of 3D measurement and reconstruction based on camera and line laser.That includes camera imaging model,monocular single-line laser 3D measurement model,binocular multi-line laser 3D measurement model,and how to stitch together the point cloud data reconstructed each time.Secondly,for most of the existing handheld 3D scanners on the market,it is necessary to paste marker points on the object to be measured.In this thesis,an automatic point cloud stitching method is proposed to capture fixed markers by camera.By adding a positioning camera to the device and placing a target plate around the object to be measured.Then,the pose relationship between the coordinate system of the positioning camera and the coordinate system of the target board is obtained by making the positioning camera shoot the target board in real time during the scanning process.The point cloud data obtained by each reconstruction is transferred to a unified world coordinate system in real time,thereby realizing the automatic splicing of point clouds.And a multi-line laser-based handheld 3D scanning reconstruction device is designed,which is composed of computer,cameras,multiline laser transmitter and target board.And based on the method and device in this thesis,a complete 3D reconstruction system algorithm flow is proposed.Finally,through the 3D reconstruction experiments of cartons,tires and other objects,it is verified that the method proposed in this thesis can automatically stitch point clouds,and has the advantages of accuracy,efficiency and robustness.And it is verified that the device designed in this thesis has the advantages of low cost,simple operation and wide application range.