然后把摄像机内参数矩阵分解为有效焦距与主点位置两部分，并利用最小二乘法分别对其进行求解。
The intrinsic parameters are separated into two parts of focal length and coordinates for the principle point, which are then solved by using the least square method.
如果exif头信息35毫米等效焦距在某一段上是有效的，相机焦距将被自动设置。
IF EXIF header information for a 35mm equivalent focal length is available for a clip, the camera focal length will be set automatically.
说明：可有效控制一些摄像机的转向、及镜头的焦距！
Some cameras can effectively control the steering, and the lens focal length!
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