EMD距离

http://wenku.baidu.com/link?url=vHRBn2mcJh62JqF0205UN1RgTP_-3ElxnTU2oR5Udz2aasGHWOHtglqmG6lFB0UbFqrFCFvRz0DNhPiW2NEfS_q9FLrSCNGW1XQdzoGzOV7

http://www.bubuko.com/infodetail-172741.html

http://blog.csdn.net/garfielder007/article/details/50389507