Principle And Establishment Of High-resolution Iateractive Scanning Light Field Display

In the past half century,governed by Moore's Law,the high-performance miniaturized integrated circuit promote the development of various industries including optical,mechanical,electrical and computational field.In this background,important cutting-edge display devices emerge in an endless stream.Since the two-dimensional display is developing towards the large-size and high-resolution performance,three-dimensional display industry has also attracted more and more concern.Many early thoughts about different types of 3D display have been realized by the new high-performance display devices,and the light field display technique is the most representative one.The light field display reconstructs the scene by reconstructing the high-density directional rays,having more advantages than holographic display which records the intensity and phase information of reconstructed objects.For example,light field display can achieve high-quality dynamic color three-dimensional display in a more simple and convenient way by combining the projection methods and computer graphic methods.Started from the description of plenoptic function and describes the simple way to describe light field in free space.The scanning light field display using high speed projector and rotating directional diffuser screen was proposed in this paper.The fundamental optical principle of this horizontal light field display was introduced in detail,including the deduction of the light field mapping relation and the analysis of optical characteristics of screen and the display zone in the display system.Based on the optical principle and the mapping algorithm,we built a scanning light field display prototype with a high-speed projector and rotating directional diffuser screen,and described the hardware and software platform in detail.In the hardware platform,we built a high speed color projector based on the digital micro-mirror device(DMD),developed a transmitted screen with deflection and directional diffusing characteristics,established the procedure of data processing and transmission pipeline,assembled each module of the data processing and transmission system including computer video card module,image decoding circuit module and synchronous signal transmission module.In the software platform,benefitting from the light field mapping relation and parallel computing method,the projection image sequences can be rendered in high frame rate.The image coding and decoding protocol is proposed for efficient transmission and rapid distribution of projection images.It finally achieved that the display images in three DMDs was rendered quickly and updated synchronously.Based on scanning light field the display prototype,we studied on the improvement of display performance and the design of human-computer interaction.The light field point spread function was put forward to analysis the scanning light field display spatial resolution,which was used to analyze the influence of spatial resolution by simulating and real experimental image.A scanning light field display system based on high speed projector array was built to improve the resolution of display scene.A halftone algorithm based on 3D mask was proposed to improve the color performance.The light field capture to light field display method was also proposed,it achieved the real-time rendering of the 3D scene captured by RGB-D camera with dynamic point clouds.For the design of human-computer interaction,we presented a panoramic viewer detection and a viewpoint distribution line fitting method,which made the horizontal-parallax-only display system achieve full-parallax performance for multiple viewers.We also presented the gesture interaction method to realize the natural interaction with the floating virtual scene,and the precise physical measurement of the virtual scene.These series of display performance improvement methods and human-computer interaction design make the display scene more vivid,which greatly broaden the application prospect of scanning light field display.Finally,conclusions of the paper are made.The potential improvements are discussed and shows a direction of future research on light field display technologies.