Three-dimensional Contour Extraction Based On Non-contact Scanning And Research On Visualization

The precision measurement is closely related to the modern industrial production,applied to the size detection, mold shaping, real-time monitoring and other fields, nowit’s an extensive research hotspot. With the rapid development of the microelectronic,mechanical, optical and other technologies as well as traditional contact measurementlimitations, the laser measurement has been given more and more attention, andbecause of its quick measurement speed and high accuracy, The laser triangulationbecomes the most widely used method of non-contact measurement. This paper studiesissues related to3-D scanning technology based on laser triangulation and outlinevisualization technology. The results and methods of this paper have importantimplications for mold shaping and visualizationThis article spends a lot of time in studying the applications on the lasertriangulation in the3-D profile measurement to design a three-dimensional laserscanning measurement system based on laser triangulation measurement principle. Themain part of the paper researches data acquisition and visualization of thethree-dimensional contours, on the basis of the studies, a laser triangulationmeasurement system based on the stepper motor is designed, and the softwarefunctionality of data acquisition, data processing and visualization are implemented.Then, this paper conducts an in-depth study on data acquisition, point cloud featurerecognition and three-dimensional contour extraction technology and so on. Aftervalidation of the experimental data, software system basically achieves its purpose ofextracting the contour lines of three-dimensional shape.This article completes the preparation software platform of the measurementsystem according to the actual needs, and designs software interface and eachfunctional module of the system based on MFC in VC++6.0developmentenvironment. Using the OpenGL graphic technology, the graphical display functionalmodule based on the MFC dialog is developed, achieving point clouds andthree-dimensional contour3-D graphic display and other operations; Based on thestructural characteristics of the point cloud acquisition, the three-dimensional pointcloud is accomplished implementation of noise reduction and interpolation; After theanalysis about the voting scale of tensor voting algorithm, set consistency checkfunction to determine the optimum value of the vote field; Based on the recognition of feature point, use the smallest forest algorithm to restructure features lines; Use theMoving Least Square Method to achieve stitching of the feature lines, and researchsegmentation and extraction of the feature structure; The contour extraction structuresare given implementation of parameter measurement, such as height, extreme points,position information; Give the comparison between contour extractions and the actualcontours and analyze error sources.The three-dimensional scanning visualization system in this paper is mainly basedon the tensor voting algorithm, which is a research focus in the computer vision, toachieve a three-dimensional object contour extraction and display, and the measuringof relevant parameters is in the range of tolerance.