opencv 各种特征

1. 颜色特征提取

http://blog.youkuaiyun.com/leixiaohua1020/article/details/13624999

http://www.360doc.com/content/13/0410/16/10724725_277397566.shtml

2.SIFT

http://blog.youkuaiyun.com/v_JULY_v/article/details/6186942

3. Gist

http://blog.sina.com.cn/s/blog_6949fede01012g6o.html

http://blog.sina.com.cn/s/blog_6052af030101qhok.html

http://wenku.baidu.com/view/719e4c226c175f0e7cd13742.html