Three Dimensional Reconstruction Of The Object Using Coded Structured Light Method

With the rapid development of computers, electro-optical elements, and lasers in the last few years, three dimensional (3D) reconstruction and surfaces measurement of the objects using coded structured light method has increasingly developed in industry. Such method has the features of low requirement of the environment, various choices of the light patterns, high precision and large measurement range. At present, it has applications in many areas such as Computer Aided Design/Manufacturing, Reverse Engineering, industrial inspection and Virtual Reality.The preliminary study about 3D reconstruction using coded structured light method is carried out. The main work is as follows:Firstly, the principle of structured light 3D measurement method is presented. Then the mathematical model using this method based on the principle of optical triangulation is established in the world coordinate system. The transform between 3D coordinates and 2D coordinate is discussed in detail.Secondly, the 3D measurement system is established based on the principle and the mathematical model of the coded structured light method. The structure, the parameters and the camera calibration of the system are introduced. The information of the object and the parameters of the camera can be obtained from the system.Thirdly, the software flow is established. The whole image processing flow chart include stripes extracting, image filtering, binary transformation and thin transformation. Then the implementation process of the 3D coordinate of the object is discussed.Finally, the computer simulation experiment and the practical experiment are carried out. Some typical samples such as the object in bowl shape and the object in rectangle shape are taken as examples. The practical experiment verifies the feasibility and availability of this structured light 3D reconstruction system.The basically study about 3D reconstruction using coded structured light method is completed. The theoretical analysis, system establishment, computer simulation and practical experiment offers the reference and the beneficial help for the further study.