最大稳定极值区域（MSER）检测

http://blog.csdn.net/zizi7/article/details/50379973

http://www.cnblogs.com/dawnminghuang/p/3779552.html

http://www.cnblogs.com/frischzenger/p/3334569.html

附：https://en.wikipedia.org/wiki/Maximally_stable_extremal_regions