http://www.cnblogs.com/ronny/p/4083537.html Oriented FAST and Rotated BRIEF
http://www.cnblogs.com/ronny/p/4009425.html harris角点
http://www.cnblogs.com/ronny/p/4083537.html Oriented FAST and Rotated BRIEF
http://www.cnblogs.com/ronny/p/4009425.html harris角点