面向体三维显示器的图形算法设计  

Graphics Algorithms Design for Volumetric 3-D Display

作　　者：邢建芳[1] 龚华军[1] 沈春林[1] 潘文平[1] 岳键[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《南京航空航天大学学报》2011年第6期786-792,共7页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家高技术研究发展计划("八六三"计划)(2007AA01Z338)资助项目;江苏省研究生科研创新计划(CX09B-083Z)资助项目

摘　　要：针对一种基于旋转双螺旋屏幕逐层扫描技术的体三维显示系统,设计并实现了一套支持真实空间三维显示的图形算法体系。算法核心主要包括立体图元的体素化,切片图像渲染和投影同步控制等3个环节。图形系统通过离散三维网格模型获取体三维显示需要的体数据,并根据螺旋屏幕的几何特征将物体的体数据集渲染成切片图像序列发送至高速投影单元,在保持投影与屏幕旋转同步的情况下,快速变换的投影图像基于视觉暂留融合成具有真实物理深度的三维影像。算法在体三维显示器样机上进行了验证,显示的三维影像占据真实物理空间,具备全方向观察角度,围绕显示器可直接观察到立体图像各个不同侧面,如同观察真实物体一样。For volumetric 3-D display whose imaging space is created by a spinning double bladed helicoidal screen with layer-by-layer scan,a graphics software framework is designed and implemented.The core structure consists of voxelization,sliced image rendering and synchronization control.Graphics system obtains volume data by discretizing mesh models in 3-D sample space,then the volumetric dataset of the object is rendered into a stack of sliced images according to helicoid geometry.Through proper synchronization control,the sliced images are projected onto the spinning screen in rapid succession.Finally,the time serie sliced images fuse into a whole 3-D image in true space because of persistence of vision.The software has been tested on a volumetric 3-D display prototype,the 3-D images occupy real physical space,and viewers can watch them directly from almost all directions and change views simply by walking around the display,just as observing real physical object.

关 键 词：体三维显示 图形算法 体数据 切片图像 同步控制 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]