Figure 2From: Learning Sparse Representations for Fruit-Fly Gene Expression Pattern Image Annotation and RetrievalIllustration 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.Back to article page