参考资料：

[1]Lazebnik S, Schmid C, Ponce J. Beyond bags of features: Spatial pyramid matching for recognizing natural scene categories[C]//Computer Vision and Pattern Recognition, 2006 IEEE Computer Society Conference on. IEEE, 2006, 2: 2169-2178.

[2]http://blog.csdn.net/love_yanhaina/article/details/8794694

【Papers】Spatial Pyramid Matching