360度可环视全屏体三维显示系统

摘要

研究了一种全屏体三维显示系统.以数字微镜器件(DMD)作为空间光调制器(SLM),将三维模型的螺旋切片序列投射到高速旋转的螺旋屏上,由于视觉暂留效应,切片序列便被人眼感知为360度可环视的三维立体图像.重点分析了基于全屏的成像空间的性能,研究了基于增强型体心立方(EBCC)采样算法的体素化策略.实验结果表明,增强型BCC采样算法较基于笛卡尔栅格的采样算法减少了30％的体素量,同时避免了体素模型出现空洞； 基于全屏的体三维空间超过原来半屏体三维显示系统的4倍,生成的图像亮度均匀；在400mm×300mm×250mm的长方体形成像空间内显示的立体图像,可从360°范围内任意视点裸眼观看.%Abstract: A volumetric display system with full helical screen is presented. When a series of helical slices of a 3D model is projected onto a rotating helical screen through a Digital Micro-mirror Device (DMD) as a fast Space Light Modulator (SLM), due to the persistence of vision, human observers are able to perceive a 360° viewable 3D image by fusing together the successive helical slices into a 3D image. We analyze the performance of the 3D imaging space created by a rotating helical screen, and emphasize the volexlization approach based on Enhanced Body-center Cubic (EBCC) sampling algorithm. Experimental results demonstrate that, compared with the voxelization approach based on Cartesian lattice, voxel hole avoidance and a voxel reduction of more than 30% are both achieved through utilizing EBCC sampling algorithm, and the prototype is capable of generating images with consistent brightness in a imaging space three times bigger than our former system with half screen. In the cuboid imaging space with length 400 mm, width 300 mm and height of 250 mm, 3D images can be viewed from any viewpoint without any special eyewear.