裸眼3D显示技术是显示内容经图像处理后传输到显示屏，再经分光器件将不同视角图像的光线按设定的不同再现角射出形成观察区域，使人的左右眼分别接收到不同视角的图像，然后通过大脑融合成立体图像的一种显示技术。将裸眼3D显示技术应用于户外大间距LED显示屏，会从根本上改变未来的传媒宣传方式，成为3D立体显示领域的一个巨大的进步。本文在调研了裸眼3D显示控制系统原理和裸眼3D内容制作方法的基础上，对用于大间距LED显示屏的裸眼3D内容制作方法和显示控制系统设计方案进行了深入研究，具体内容如下：针对单幅2D图片形成3D视差图片方法进行了研究，提出了针对大间距LED显示屏的视差图像处理算法。此算法可以在虚拟相机参数未知的情况下，根据显示屏的像素间距和分辨率来获取视差图片，获取的图片视差信息符合大间距裸眼3D LED显示屏的显示要求。针对双视点视差图片形成多视点视差图片的方法进行了研究，提出了针对大间距LED显示屏的多视点图像处理算法。该算法首先提取视差图片的稀疏特征，形成稀疏特征视差矩阵，并将形成的视差矩阵进行归一化处理，使其符合大间距LED屏裸眼3D显示的要求。其次根据视差矩阵和参考图像，形成两幅虚拟视点图像。最后将参考图像与虚拟视点图像以交错格式融合形成虚拟视图。设计并搭建了双视区显示控制系统，双视区显示控制系统相比单视区显示控制系统能够有效地消除视觉黑区，增大了观看视角范围。双视区显示控制系统由视频处理模块和视频显示模块组成，视频处理模块以软件的方式实现，为了弥补因LED显示屏分辨率低而影响3D效果这一不足，提出了利用人体的视觉暂留来提升虚拟分辨率的图像处理方法。视频显示模块主要涉及LED显示屏的显示控制系统。显示控制系统采用对两个视区分别进行控制的方式实现，因此在双视区显示控制系统上既可以播放单幅多视点图像，也可以播放多幅双视点图像。在此平台上对视差图像处理算法和多视点图像处理算法进行了实验验证，实验结果均达到了研究预期。
The glasses-free 3D display technology transmits the display content after image processing to the display board. Different stereoscopic elements reflect lights based on different set reflective angels and then form an observing area. The brain automatically fuses stereoscopic images because the left eye and the right eye receive parallax images from different angels. The glasses-free 3D display technology can be used for outdoor large-spacing displays, which can fundamentally change the future of media publicity and is a huge step in the field of 3D stereoscopic display.Based on the study of basic principles of the Glasses-free 3D display control system and content production methods, this dissertation studied in-depth the display control system and content production methods which can be used for outdoor large-spacing displays. Details of the research are as follows:First, the researcher studied the method in which 2D images transfer into 3D parallax images and thus proposed image processing algorithms for outdoor large-spacing LED 2D images to transfer into 3D images. With algorithms, even if the virtual camera parameters are unknown, the parallax images can still be obtained according to the display pixel pitch and resolution. Besides, the 3D image formed by algorithm can have parallax information in line with the characteristics of glasses-free 3D display on large-spacing LED.Second, the researcher studied how parallax images form multi-view pictures and developed the multi-view image processing algorithm for large-spacing LED displays. This algorithm first extracts sparse features of parallax images and forms the matrix of sparse features; then it normalizes the parallax matrix to match characteristics of Glasses-free 3D Display on large-spacing LED. Second, it forms two virtual viewpoint images according to the disparity matrix and the reference image. Finally, the reference image and the virtual viewpoint image are formed into a virtual-view image in a staggered format.Third, the researcher designed and built a dual view-port display control system, and experimented algorithms of Glasses-free 3D Display content production on this platform. The research result was as expected. Compared with the single view-port display control system, dual system effectively eliminates the black visual area, expands viewing range. Dual view-port display control system is composed of one video processing module and one video display module. The video processing module is based on software processing. To compensate for the unsatisfactory 3D effects due to the low resolution of the large-spacing LED, the researcher proposed a method which can enhance the virtual-resolution based on the body vision persistence. The video display involves LED display control system, and controls two view-ports separately. Therefore, the dual view-port display control system can play two different two-viewpoint images or a multi-viewpoint image.
