Constants - Constant Value,such as enum,int,etc...
Cv2 - Wrapper of OpenCv,Use like C++
Handles - SafeHandleCollection,Maybe this type must use the internal scope
Interface - Intermediaries between the Mat,Umat,InputArray,OutputArray,InputOutputArray
Models - The intergrate of the Handles and PInvoke
PInvoke - The native method of OpenCv