Design And Implementation Of The 3D Information Acquisition System Based On Digital Micro-mirror Device

Pursuing the products of the 3D technology such as the 3D printing and the 3D display has gradually become a hot point in recent years. One important procedure of the 3D technology is the acquisition of the 3D information. The structure light 3D information acquisition solution with its advantages of low cost, convenient operation and rapid imaging is widely researched and applied in areas of biomedical, cultural relic preservation, reverse engineering, etc.The flow of the structure light 3D information acquisition mainly includes the system calibration, coding and decoding of the structure light, the extraction of the 3D point cloud and the 3D reconstruction. It is precise and reliable when the 3D point cloud information is obtained with calibration in structure light system. However, the steps taken by calibration are complicated with many parameters to handle. Besides, a lot of matrixes and vectors are operated when extracting the 3D point cloud. Thus, this thesis presents a solution of 3D information acquisition with non-calibration, which utilizes the time-multiplexing Gray code structure light. The solution simplifies the operation of the 3D information acquisition and also lowers the difficulty of extracting the 3D point cloud.To verify the solution of the 3D information acquisition with non-calibration, this thesis presents the design of the high-speed hardware circuits based on Digital Micro-mirror Device, the construction of the software system and the realization of the algorithm used in the 3D information acquisition including the binarization, decoding, calculating the distortions and extracting the 3D point cloud. The performance test of the system and the acquisition result of 3D information are also presented. Furthermore, the structure light patterns switch in rather high frequency, which can be used for the rapid 3D rendering and even the dynamic 3D reconstruction.