Affine invariant feature extraction using symmetry

This paper describes a novel method for extracting affine invariant regions from images, based on an intuitive notion of symmetry. We define a local affine-invariant symmetry measure and derive a technique for obtaining symmetry regions. Compared to previous approaches the regions obtained are considered to be salient regions, of the image. We apply the symmetry-based technique to obtain affine-invariant regions in images with large-scale difference and demonstrate superior performance compared to existing methods.