面向球幕投影系统的几何校正方法  

Geometry Correction Method for Projection onto Spheres

作　　者：王明冬 盖孟 赖舜男[2,3] 王震 WANG Ming-dong;GAI Meng;LAI Shun-nan;WANG Zhen(School of Electronic and Computer Engineering,Peking University Shenzhen Graduate School,Peking University,Shenzhen Guangdong 518055,China;School of Electronics Engineering and Computer Science,Peking University,Beijing 100871,China;Beijing Engineering Technology Research Center of Virtual Simulation and Visualization,Peking University,Beijing 100871,China;Shenyang Ligong University,Shenyang Liaoning 110159,China)

机构地区：[1]北京大学深圳研究生院信息工程学院,广东深圳518055 [2]北京大学信息科学技术学院,北京100871 [3]北京大学北京市虚拟仿真与可视化工程技术研究中心,北京100871 [4]沈阳理工大学,辽宁沈阳110159

出　　处：《图学学报》2019年第4期631-636,共6页Journal of Graphics

基　　金：国家自然基金重点项目(61632003);国家自然基金面上项目(61872398);装备预研基金项目(315050501);国家重点研发计划课题(2017YFB1002601)

摘　　要：用于飞行模拟的视景仿真系统,经常会以多台投影仪同步投影以得到较大范围的视场角。当投影机斜对屏幕或者投影屏幕为曲面时,图像会发生几何失真。针对此问题,本文提出了一种专门面向球幕投影系统的几何校正方法,并以一个三通道显示系统为实例,详述了该方法的理论原理以及校正流程。实例结果表明,经几何校正后,各投影图像无几何畸变,通道过渡处几何内容完全一致。该方法是一种纯软件方法,成本小而且操作简单,能够适应于不同的投影场景。A visual simulation system for flight simulation often uses multiple projectors to simultaneously project a surface to obtain a wider range of viewing angles.When the projector is tilted to the screen or the projection screen is a curved surface,the image is geometrically distorted.Aiming at this problem,this paper proposes a geometric correction method for the dome projection system.Taking a three-channel display system as an example,the present study describes the theoretical principle and correction process of the method in detail.The example results show that after geometric correction,each projection image has no geometric distortion,and the geometrical content of the channel transition is completely consistent.The method is a pure software method,which is small in cost and simple in operation,and can be adapted to different projection scenarios.

关 键 词：球幕 几何校正 飞行模拟器 多投影 OPENGL 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]