虚拟演播室中节目主持人或演员与虚拟场景融合的一种技术方案

A scheme of inosculation between master of ceremony or player and virtual scene in virtual studio

研制了用跟踪器和测距器改进传统BETACAM摄像机并与主机软件模块链接的虚拟演播室系统,提出了相机后相机偶合对模型以解决节目主持人对虚拟场景的融入问题并与实际BETACAM摄像机进行捆绑,导出了以实拍BETACAM摄像机投影中心点深度信息为区分界限的虚拟场景前景帧缓存和背景帧缓存的成像公式,达到了实拍节目主持人视频图像与虚拟场景的计算机CG图像在空间位置及其透视投影关系、图像对象掩模关系上的实时一致的效果,实验结果表明文中所研制的虚拟演播室构造技术是可行的,比目前已有的基于抠像及与背景合成的视频编辑技术的虚拟演播室技术更为理想和实用。

A technical principle about construction of virtual studio has been proposed where tracker and distance telemeter has been used for improving conventional BETACAM pickup camera and connecting with the software module of the host. A model of virtual camera called camera & post-camera coupling pair has been put forward, which has been bound to real BETACAM pickup camera for shooting the master of ceremonies. The formula has been educed to compute the foreground frame buffer image and the background frame buffer image of the virtual scene whose boundary is based on the depth information of central point of the real BETACAM pickup cameras projective ray. Real-time consistent has been achieved between the video image sequences of the master of ceremonies and the CG video image sequences for the virtual scene in spatial position, projective relationship and image masking. The experimental result has showed that the technological scheme of construction of virtual studio submitted in this paper is feasible and is more applicative and more effective than the existing technology to establish a virtual studio based on chroma-key and image synthesis with background using non-linear video editing technique.