金字塔匹配算法，包括SIFT特征点的提取，聚类和构造金字塔特征表示，论文参考：Beyond Bags of Features: Spatial Pyramid Matching for Recognizing Natural Scene Categories matlab代码

images
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hist_isect_c.c
BuildHistograms.m
BuildPyramid.m
CalculateDictionary.m
CompilePyramid.m
Example.m
GenerateSiftDescriptors.m
hist_isect.m
sp_dist2.m
sp_find_grid.m
sp_find_sift_grid.m
sp_kmeans.m
sp_load_image.m
sp_make_dir.m
sp_normalize_sift.m
ReadMe.txt

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