基于多视角采样校正的大尺度多投影光场显示系统

A large-scale multi-projection light-field display based on multi-view sampling calibration

提出了一种基于多视角采样校正的大尺度多投影光场三维显示系统,系统采用了360台投影仪环绕投影在直径3 m、高1.8 m的柱形各向异性散射屏上,并在柱形屏内部精确重构出物体的三维光场。该系统能在360°范围内显示可供多人多角度同时观看的具有平滑运动视差的大尺度三维场景,其中动态场景的绘制帧率达30 frame/s及以上,具有流畅的动态效果。设计了一种宽场柱面屏幕投影镜头来扩展投影仪画幅,并设计了一种基于相机多角度采样的光场自动校正方法,用于校正宽场镜头引入的非线性畸变以及系统装配引入的误差,实现了对360台投影仪光场的拼接融合。

A large-scale multi-projection light-field 3D display system based on multi-view sampling calibration was proposed. In this system 360 projectors were arranged in a circle under an anisotropic cylindrical diffuser with 3 m diagmeter and 1.8 m height and projecting images onto the diffuser. Light field of 3D scenes was accurately reconstructed inside the screen and can be observed by multiple viewers from different angles and positions simultaneously around 360°, as well as providing smooth motion parallax. Rendering frame rate of dynamic scenes can achieve 30 frame/s and above, offering fluent visual experience. To realize this system, a wide-field projection lens with cylindrical lenses was designed to enlarge image of the projectors. Then an automatic light-field calibration method based on multi-view sampling was proposed to eliminate distortion, which was induced by non-linear distortion of the projection lens and system assembly error, from the projection images. After calibration, light field projected by 360 projectors can be fuszed together seamlessly.