多投影立体显示系统中的几何校正及边缘融合研究.docVIP

 多投影立体显示系统中的几何校正及边缘 融合研究 徐卉，贾庆轩 5 10 15 20 25 30 （北京邮电大学自动化学院） 摘要：本文分析了多投影虚拟系统中的立体显示原理及体系结构，并基于光学被动立体显示 方式研究该系统的基本关键技术。首先介绍了本文的立体显示模式及体系结构，基于此模式 进行几何校正及边缘融合关键技术的研究。其中几何校正首先通过数学模型的计算，按照计 算结果对投影图像的形状进行预畸变，之后再以纹理贴图的方式将图像复制在与屏幕形状相 同的背景上；在几何校正基础上利用网格对齐完成无缝拼接；边缘融合部分，屏幕上通道间 的投影重叠区域则采用控制点拟合生成的融合曲线算法生成融合纹理，以通过多重纹理贴图 的方法将融合纹理与投影图像重叠生投影在屏幕上，消除通道间的亮带影响。 关键词：虚拟现实；多投影立体显示；几何校正；边缘融合 中图分类号：TP391 Research of geometic correction and edge blending based on multi-projector stereo display system Xu Hui, Jia Qingxuan (Automation School of Beijing University of Posts and Telecommunications) Abstract: In this paper, stereoscopic display theory and the structure of multi-projector virtual system is analyzed. and the key technologies are studied based on optical passive stereoscopic display mode of the system. Firstly the three-dimensional display mode and system structure are introduced, based on which geometric correction and the edge blending calculation are researched. In the part of geometry correction, the mathematical model between projector and screen is calculated, and the projection image should have predistortion according to the result of the calculation, and then the image is projectored on the grid background with the same shape of screen as a texture map; Image mosaic could be complete through grid align based on the geometric correction; In the part of edge blending, a group of control points are used to create the curve for edge blending, which is calculated by real-time function interpolation. With the method of multiple texture map, projection image that is overlapped with blending texture will be projected on the projection screen, eliminating the effects of the bright band. Key words: virtual reality; multi-projector stereoscopic display; geometic correction; edge blending 35 0 引言 在这个真实的三维世界中，二维平面显示越来越不能满足人们视觉上的需求。人们希望 显示技术可以通过影像逼真的反映现实中的客观事物，立体显示技术也就应运而生。 我国在立体显示技术上起步较晚，与国际上的研究水平有一定的差距，但在很多高校和 40 45 企业也在此方面取得了一些成果。三维立体显示按基本工作原理可分为基于双目视差和非基 于双目视差两种，基于双目视差立体显示的原理