The Study And Implementation Of Naked-eye Three-dimensional Display And Data Acquisition System

Naked-eye three-dimensional display and data acquisition system are being continuously studied in recent several hundred years. In recent years, with rapid development of information technology and upgrade of application demands, parts of key breakthroughs were made in the naked-eye three-dimensional display. In authors' view, it is important and valuable to study the high-performance, low-cost naked-eye three-dimensional display and 3D film acquisition method. The National Natural Science Foundation of China has included "naked-eye three-dimensional display theories and technologies" in the key research projects in 2010.In this thesis,3D information acquisition system based on structured light, true 3D volumetric display and super large panel autostereoscopic display were discussed in detail. We have made some achievements with independent intellectual property rights and laid a good foundation for further research and application.The main contents of the thesis include,1. Study on 3D information acquisition. Several sets of manual 3D information acquisition equipments based on the structured light were developed. Automatic acquisition system based on line laser was designed and camera parameter calibration, laser center extracting, abnormal point handling, data repairing, point cloud processing,3D reconstruction were achieved. In addition, automatic acquisition system based on projection was designed. Color structured light encoding, image preprocessing and model reconstruction were implemented. Naked-eye three-dimensional data source was finally generated.2. Study on true 3D volumetric display. The true 3D volumetric display is a naked-eye three-dimensional display method based on volumetric display technology. It can truly display 3D model made by the computer or acquired by structured light. In this chapter, the advantage of high-speed synchronous display interface and the deficiency of traditional scan scheme were analyzed. With the multiprocessor array, a useful true 3D volumetric display was designed. By fully using its high-speed bandwidth, voxel volume homogenization and voxel luminance homogenization were implemented. The high brightness effect and viewing angle with horizontal 360°and vertical 180°were obtained.3. Study on autostereoscopic shooting and software platform. First, we introduced free-track 3D scene shooting approaches including composition, color, lighting, etc. Through the study on 3D Art theory, the perception of 3D image and color psychology were discussed and 3D production technique was summarized. Then, we put forward synthesis algorithm appropriate for LCD and DLP 3D display and succeeded in making 3D game software platform and large panel autostereoscopic player. Finally, on the basis of the measurement on horizontal parallax limitation, we analyzed and calculated the relationship between 3D tolerance range and the distance of cameras. The model for 3D tolerance range was built, the interval of multi cameras meeting the smaller distortion was calculated and the optimal distance of cameras was gained. The theory for shooting 3D scene was proposed.4. Study on large panel autostereoscopic display based on DLP and lenticular lens. A geometric model based on DLP autostereoscopic display was built and light energy distribution of viewing zones is simulated. It verified that by using DLP projection, optimal stereo images without crosstalk can be obtained at the optimal viewing distance. Then, the parameter of lenticular lens for large panel autostereoscopic display was calculated and the dynamic searching method of grating focal plane, fine tuning method of focal length, assembly method based on initiative pattern, assembly method based on passive pattern, quick measurement method of stereo degree were proposed. A rapid precise assembly and testing for single model display were implemented. Moreover, rear-projection screen materials suitable for three-dimensional display were discussed and splicing method for super large panel autostereoscopic display was presented in this thesis. By measuring the light energy distribution, the actual three-dimensional effect is proved close to the theoretical value. A large panel autostereoscopic display with good telepresence and three-dimensional effect was eventually achieved.Two display systems are expected to be applied in practice.