Research And Implementation On Key Technologies Of Volumetric Display System

Under the support of National Hi-tech Programme—Interactive Volumetric 3D Display (2006AA01Z327), and Project of National Defense Pre-Research Foundation of China—True 3-D Volumetric Display (K1601060109), the key technologies of the volumetric display are researched and a volumetric prototype based on such technologies is implemented.The volumetric display technology is the major method to realize the true 3D display. In this dissertation, the vision theory of the volumetric display is introduced. The construction of the system, the image engine, the image dead-zone, the generation of data and other key techniques are researched, together with the results of relative experiments being presented in the paper. The contributions of the dissertation are mainly listed as following:This dissertation firstly investigates the basic function of vision and the essential display principle is given. It's the vision persistence and apparent movement that make the volumetric display system works. The former gives the static display effect, while the latter focuses on the dynamic display. The three dimensional image is provided by both of them. Additonally, the interrelated researches provide the theoretical ground for system simulation and analysis.The key technologies in the volumetric display system are system-construction and image engine. The critical issues that need to be resolved include: the creation of the image space, the activiation of the lightening voxels, the design of image engine and the dead zone analysis. In the aspect of creating image space, the emphasis of this paper lies in the analysis of two major media for imaging: the lightening plane medium and the diffusing helix medium. The latter features high quality imagery, which makes helix screen the ideal medium for the volumetric system. In terms of activating the voxels, two modes of addressing methods are mentioned: the linear and parallel addressing menthods. Based on the high-speed SLM, the parallel addressing method enhances the amount of voxels to a great extent. According to the discussion above, the SLM&helix screen solution is established, which reduces the huge amounts of voxel data and preserves the equally excellent image quality. The following part elaborates the design of image engine and the various dead-zone solutions.The dissertation also proposes the fast voxelization algorithm. The details of this algorithm are discussed in the paper. The introduction of the BCC lattice sampling space in this algorithm presents a well-around solution to deal with the huge amounts of voxel data. Therefore, the sampling and transforming methods are performed under the BCC lattice sampling space. Proved by corresponding experiments, an efficient reduction of the storage is realized by means of BCC lattice, which accelerates the proccess of the voxelization. Besides, the local presicion of the three dimentional image is also increased.Finally, the volumetric display platform is implemented. This dissertation mainly emphasizes the design of the hardware and software of this platform. Meantime, a discussion of the SLM based on DMD, the projection technique, data format, and a mapping algorithm matching to the helix screen is performed to accomplish the final three dimentional images. The results demonstrate that the prototype has made ground-breaking works in terms of the description of the complex image and its clearity. Part of the performance parameters approaches the international level.The core achievement of this dissertation is a prototype of Helix-3D volumetric display system, with its performance fulfilling our design requirement. This prototype can act as a basic platform for future research work of high performance volumetric display system.