色键是传统电视节目制作中常用的技术.虚拟演播室是在此基础上发展而来的,它是用计算机生成的场景替换蓝色背景,并运用计算机技术和视频合成技术,使演员可以在虚拟的场景中“表演”,与虚拟对象(如卡通动物等)“交互”,真正实现虚实结合.这里侧重讨论虚拟演播室系统的结构以及关键技术.

Virtual Studio uses computer-generated scene as its background. It applies computer technology and video compositing technology to combine the actors and the virtual scene seamlessly, and gives audience a full new vision effect. It brings up a revolution to video making. The structure of Virtual Studio system includes three parts: camera tracking, background rendering and video compositing. Its key technology consists of camera tracking, camera switching and focusing, blue room design and background rendering, synchronization and compositing, etc. This paper addresses the structure, technology and some problems of Virtual Studio.