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Kernelizing Spatially Consistent Visual Matches for Fine-Grained Classification

This paper introduces a new image representation relying on the spatial pooling of geometrically consistent visual matches. We therefore introduce a new match kernel based on the inverse rank of the shared nearest neighbors combined with local geometric constraints. To avoid overfitting and reduce processing costs, the dimensionality of the resulting over-complete representation is further reduced by hierarchically pooling the raw consistent matches according to their spatial position in the training images. The final image representation is obtained by concatenating the resulting feature vectors at several resolutions. Learning from these representations using a logistic regression classifier is shown to provide excellent fine-grained classification performances outperforming the results reported in the literature on several classification tasks.