使用OPENCV实现BMP格式转PGM格式，并输出PGM格式图片-Transform bmp to pgm picture using opencv, and then show pgm picture.

此程序为opencv中的图片格式的转换，主要是JPG,BMP,TIF,PNG,PPM转到JPG,BMP,TIF,PNG,PPM-This program in opencv image format conversion, JPG, BMP, TIF, PNG, PPM, go to JPG, BMP, TIF, PNG, PPM,

将bmp位图转为OpenCv的ipl格式，这种转换是最经常用到的。可是有很多人不知道怎么转，我在这里特意实现了它。供参考-Bmp bitmap will be converted to the OpenCv ipl format, this conversion is the most frequently used. But there are a lot of people do not know how to turn, I am here specifically to achieve