一个将训练的检测器转换成XML文件的代码，使用方便灵活。-The training of a detector into code XML files, easy to use and flexible.

将不符合opencv打开的文档转换为符合opencv打开的XML文档。可以进行批量处理。

采用棋盘纸定标，通过过相机捕获到的图片，不断旋转棋盘纸的位置，在4个坐标系之间的的来回转换，最后得到相机的内外参，注意保存在xml文件里(Chessboard calibration is adopted. Through the pictures captured by the camera, the position of chessboard is constantly rotated, and the conversion between the 4 coordinate systems