This method uses a single standard CCD camera with telecentric lens, moving object along optical axis, images are taken at the two object position.

• 该方法采用一台带有远心镜头的CCD摄像机，沿光轴方向移动目标拍摄两幅图像，根据所拍摄景物图像的散焦半径与图像大小计算目标景物距摄像机的距离。