为了成功地应用增强现实，需要有观察仪器的准确投影信息，这就要求对所使用的光学透视式头盔显示器进行标定。针对实验室的光学透视式增强现实系统的组成特点，选定了虚拟摄像机（头盔显示器与人眼的结合）的标定算法。根据对投影矩阵的退化点结构的影响，改进了选取标定的对应点个数和用户头部的运动轨迹。实验结果表明，标定效果明显改善了，成功率也有明显提高。

For a successful augmented reality application,precise projection information of the viewing device is required,which has to calibrate the optical see-through head-mounted display in use.Based on our system,this paper selects the calibration algorithm of the virtual camera which models the combination of HMD and user's eye.According to the influence of degenerate point configurations of projection matrix,the number of calibration correspondences and the track of user's head are improved.Experiments reveal that the calibration effect is meliorated distinctly and the success rate is increased greatly.