Figure 2 .

Illustration of image patch extraction and the three levels of bag-of-words partitioning with weighting factors for the spatial pyramid approach. After feature description using the overlapping circular patches, three levels of bag-of-words partitioning are shown. The top level of partitioning is just a global bag-of-words representation.

Yuan et al. BMC Bioinformatics 2012 13:107   doi:10.1186/1471-2105-13-107
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