Research Of Key Technology Of3D Laser Measuring Instrument

This paper is aimed at the research of key Technology of3D laser measuringinstrument,containing the aspects of The system structure,2D image processing,3Dreconstruction, point cloud processing and so on.In light of each key Technology wehave described its technical route,formulated corresponding solution,realized thefunction of each part of machine,and finally Completed the overall design and keytechnology research of3D laser measuring instrument.First, we adopt computer serial communication mode between upper and lowerto establish the system structure,Designed the scanning measuring method basing onStepper motor,used the measuring method of Laser scanning basing on Linestructured laser light source,Obtained the structured light image using CCDcamera.Basing all above we Completed the structural design of3D laser measuringinstrument.In the2D image processing,we adopted steger algorithm to extract fringe centerof Structured light image,and use the method of Mesh segmentation to reduce thecalculation of image processing,as a result algorithm was simplified,and a result formof the two-dimensional coordinates was output.In the paper,an2D image of Structuredlight illuminating to human body was Image processed,the result was Relativelygood,which verified the feasibility of the algorithm.In3D Reconstruction,we calibrate the image magnification in system by a blackand white checkerboard calibration plate whose size is known. Basing on Thestructure of rotary scanning measurement,Combining the related knowledge of solidgeometry,we worked out the Three dimensional coordinate reconstruction algorithmof two-dimensional pixel coordinates.We designed a measuring structure containingthree sensors to realize360degree measurement of the object to be measured,usedCoordinate rotation to deduce3D Reconstruction algorithm of three sensors,obtainedThe initial point cloud data.In the research work of post processing of point cloud,First we analyzed the errorsources of the system model and algorithm,according to the problem that distance isvariable parameters in rotary scanning,pointed out the shortcomings of thethree-dimensional reconstruction algorithm,put forward a modification scheme.We adopted a Iterative correction algorithm aiming to variable distance,Completed aiterative correction of the initial point cloud data,and verified the algorithm Inexperiment.In the experiment,we sampled the original point cloud data,calculated theobjective function value by sampling point,and compared the function value and thetrue value.Through multiple correction, the result Proves that The algorithmcan reduce the measurement error and it is convergence.For the problem ofmultiple point cloud splicing,Basing on the principle of ICP algorithm on theclassical,we adopted The improved ICP algorithm,calculate the weight of "pointpairs", improved the operational efficiency.Using the M-estimation to improve theobjective function,we removed the interference of spatial abnormal point.as a resultthe point cloud data were more accurate,the measurement precision of3D Measureme-nt instrument was improved.Finally, the key technologies of3D measurement instrument were summarizedand prospected.We put forward the improvement space measuring instrument and itsdevelopment prospects.In this paper,the key technology of3D laser measuringinstrument such as the structure parameters of each component,algorithm principleand technical route is studied in many aspects,The advantages and disadvantages ofeach key technology is analyzed,the solution is Proposed and realized.We made Acomprehensive study of the system and demonstrated the implementation schemeof3D laser measuring instrument, provided a technical basis for industrialproduction research and development of3D laser measuring instrument.We hope thattechnology research in this article for3D measurement can Allow people tounderstand the structure of three-dimensional laser measurement instrument, principleand function,bring the significance to scientists in related fields and promotethe development of3D measurement industry.