Three Dimensional Reconstruction Of Object Based On Color Gray Code

As one branch of image processing, 3D reconstruction technology which is a key mean of obtaining 3D space coordinates is used for recovering object's surface. Compared with traditional two dimensional view, 3D reconstruction result contains height information, so it is able to reflect object more really and completely. Based on practical significance of 3D reconstruction, the technology has wide application and extremely high commercial value in the fields of reverse engineering,medical diagnosis,industrial production and reconstruction of culture historic site. Among many 3D reconstruction methods, optical method is more and more becoming research focus due to its non-contact character,high precision,high measurement speed. Besides phase method,interferometry method,fourier transform method etc, structured light method projecting light which is connected with color information on the surface of an object is used extensively and considered as a major research direction.In the paper, a color gray code reconstruction method is carried out. The main research topics are as follows:Firstly, many 3D reconstruction methods are introduced, meanwhile, current status and development trend in the area are described in detail. Emphasized on structured light method, not only its basis principle and application range are explained, but also various methods are analyzed and compared. Then mathematical model is established according to the principle of coding structured light method.Secondly, the theory of constitution of image combined by RGB is elaborated, as considering system's anti-interfering ability, a color gray code proposal is designed. Afterwards, pattern encoding,pattern decoding,codeword correction,texture mapping which is used to increase details of object's surface are introduced. Then, the calibration method of the whole system is precisely deduced.Finally, on the basis of principle analysis, the MATLAB software platform is used to make analog reconstruction. After the efficiency of the theory being checked out, considering carefully the effect of environment factors, an experimental platform is made to reconstruct real object, also experimental result and error analysis are provided.The experiment result proves that the color gray code method proposed in the paper is effective to reconstruct object which has color information on its surface. The research work in the paper provides reference and help for 3D reconstruction technology based on coding structured light in future.