Kernelizing Spatially Consistent Visual Matches for Fine-Grained Classification
Résumé
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 in-
verse rank of the shared nearest neighbors combined with
local geometric constraints. To avoid overtting 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 spa-
tial position in the training images. The nal image repre-
sentation is obtained by concatenating the resulting feature
vectors at several resolutions. Learning from these represen-
tations using a logistic regression classier is shown to pro-
vide excellent ne-grained classication performances out-
performing the results reported in the literature on several
classication tasks.