Technical Report CIS-2009-10

TR#:CIS-2009-10
Class:CIS
Title: Affine-invariant spatial vocabularies
Authors: Alex. M. Bronstein and Michael. M. Bronstein
PDFCIS-2009-10.pdf
Abstract: Invariant image descriptors play an important role in many computer vision and pattern recognition problems such as image search and retrieval. A dominant paradigm today is that of \bags of features", a representation of images as distributions of primitive visual elements. The main disadvantage of this approach is the loss of spatial relations between features, whi ch often carry important information about the image. In this paper, we show how to construct spatially-sensitive image descriptors in which both the features and their relation are a±ne-invariant. Our construction is based on a vocabulary of pairs of features coupled with a vocabulary of invariant spatial relations between the features. Experimental results show the advantage of our approach in image retrieval applications.
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