关键词: 摄像机定标, 虚拟摄像机, 视点转换矩阵, 投影矩阵

Abstract: The creation of virtual camera is a key technology in the virtual advertisement system.This paper proposes a method of creating a virtual static camera.Firstly，detect the feature points in the video frames，next calculate camera’s inner and external parameters according the correspondence of feature points both in the image coordinates and the world coordinates with the camera calibration technology，then set the virtual camera’s model view matrix and projection matrix on OSG with the parameters calibrated.Finally，render the virtual scene under this virtual camera and blend the rendered results into the right positions in the video frames.The experiment proves this method sample，effective and easily produced.

Key words: camera calibration, virtual camera, model view matrix, projection matrix