在头位跟踪的摄像机标定中,传统的线性模型标定精度低,不能精确获得头部位置参数。系统利用CCD摄像机,结合摄像机模型,考虑摄像机镜头的径向畸变,求出三角形的三个顶点的像素坐标,由此确定瞄准线的空间位置,进而求出方位角、俯仰角。通过实验比较了线性模型和畸变模型在三维重建中的误差,结果表明该考虑径向畸变的模型与线性模型相比精度上提高了30%。

The traditional linear model in the camera calibration of head position tracking has a relatively lower calibration precision while the exact head position parameters cannot be obtained. Using CCD camera with the camera model and considering the camera lens′ radial distortion, the three vertexes′ pixel coordinates of the triangle are extracted, which determines the sighting line in the space position. The azimuth and the angle of pitch are extracted. The error in 3D reconstruction of linear model and distortion model are compared through experiment. The result shows that the precision is increased by 30% with the model of camera lens′ radial distortion than with traditional linear model calibration.