| Light field three-dimensional (3D) display technique, which was proposed several years ago, is one of the novel3D displays. This technique, similar to holographic display, tries to record and reconstruct the rays in different directions emitting from every point of3D objects. Therefore, it can not only reconstruct the spatial property of3D scenes really, but also represent the occlusion relation between different objects correctly. Since light field display conforms with the human vision, it has become one of the research hotspots in recent years.Based on the plenoptic function, the thesis involves the issue of light field reconstruction. After brief introduction of the principle of light field display, rotating directional diffuser, cylindrical directional diffuser and flat light field directional diffuser are utilized to develop360-degree light field display system respectively. The configuration and reconstruction method of these three types of3D displays are highlighted, and the3D display zone and image observed at one viewpoint are analyzed in detail. It provides theoretical references for establishment of light field3D display prototypes and subsequent performance evaluation.We developed the color high-frame-rate DMD-based projector, and designed the directional diffuser with featured diffusing characteristics. Then we solved the key problems including acquisition and computation of light field, rapid generation of projecting images, efficient compression and high-speed transmission of mass data, synchronization of scanning light field, and so on.360-degree light field3D display system based on rotating directional diffuser and flat light field directional diffuser were built successively. The experimental systems demonstrate the feasibility of the method which is utilizing high-frame-rate projector and synchronously rotating directional diffusing screen to achieve360-degree light field3D display, and provides an effective platform to further study the performance of light field3D display. The floating360-degree floating3D display made the whole displayed3D scenes floating over the flat light field directional diffuser in the air successfully for the first time. It establishes the foundation for the further study of real-time interaction with the reconstructed3D scenes.With the further development of3D display, the performance evaluation of displayed3D image is gradually becoming the direction of the next research. Based on the experimental platform, the spatial reconstruction ability was analyzed in detail, and computational method of the spatial resolution and angular resolution was presented. From the perspective of amount of information, the characteristic of ray multiplexing was proposed and analyzed. Besides, we presented the evaluation function of the accuracy of light field reconstruction, which provides theoretical guidance for further evaluation of displayed3D images. We also improved the proposed display system in some respects. The method of true-color light field3D display based on LED luminance modulation was presented. And the experimental result showed that the method could increase the gray scale significantly with the same number of projecting binary images. Based on the current data transmitting system, the method of gesture-based3D interaction was initially researched, and the experimental results verified this method.At last, we have discussed the development of light field3D display. Based on the existing deficiency of experimental system, we analyzed on many aspects, such as display device, screen device, vertical free viewpoint, real-time image generation and mass data transmission, evaluation system of3D image, physiology and psychology of visual cognition and so on. It shows us a research direction of future research and development. |
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