一种基于视频捕获的多投影显示系统

A VIDEO CAPTURE BASED MULTIPLE-PROJECTOR DISPLAY SYSTEM

随着科学技术的高速发展以及信息量的急速膨胀,具有多个输出画面的多通道计算机系统得到了广泛应用。多显示器/拼接单元系统无法生成大尺寸高分辨率的无缝画面,多投影显示系统可克服这类系统的不足。提出一种基于视频捕获的多投影显示系统,它将多通道的画面显示与画面生成相分离,从而避免显示系统对画面生成系统的影响。该系统针对VGA模拟视频信号输入,给出基于三维查找表的颜色校正技术;针对非参数化成像模型的投影仪,给出多投影系统颜色校正的三阶段模型及其求解方法;针对工程实际,设计了基于自由曲面变形的交互式网格编辑工具进行多投影系统的几何校正。实验结果表明本系统及其关键技术切实有效,适用于构建投影数量中等规模的显示系统。

With the rapid development of science and technology and bursting information explosion,the computing systems with multiple display channels are employed widely.As the display systems using multiple monitors or display cells can not generate large seamless images with high resolution,the multiple-projector display system can overcome the shortcomings of the aforementioned systems.In this paper,a multiple-projector display system based on video capture is proposed.It separates the image generator from the display units to avoid the impact of the display system on generation system.For capturing the analog VGA signal,the colour correction technique is proposed based on 3D Lookup Table（LUT）.For projector whose imaging model can not be modelled using parameters,the three-phase model of colour calibration technique for multiple-projector system and its solution approach are proposed.For engineering practice,the interactive mesh editing tool based on free-surface deformation is designed to conduct geometry calibration for multiple-projector system.Experimental results illustrate that our system and its key techniques are practical and effective,and are suitable to constructing the display system with modest number of projectors.