title: Affine invariant pattern recognition using Multiscale Autoconvolution.
abstract: This paper presents a new affine invariant image transform called Multiscale Autoconvolution (MSA). The proposed transform is based on a probabilistic interpretation of the image function. The method is directly applicable to isolated objects and does not require extraction of boundaries or interest points, and the computational load is significantly reduced using the Fast Fourier Transform. The transform values can be used as descriptors for affine invariant pattern classification and, in this article, we illustrate their performance in various object classification tasks. As shown by a comparison with other affine invariant techniques, the new method appears to be suitable for problems where image distortions can be approximated with affine transformations.
authors.affiliation: Machine Vision Group, Infotech Oulu, Finland. erahtu@ee.oulu.fi
authors.forename: Esa
authors.initials: E
authors.lastname: Rahtu
authors.forename: Mikko
authors.initials: M
authors.lastname: Salo
authors.forename: Janne
authors.initials: J
authors.lastname: Heikkilä
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D016000:Cluster Analysis; D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods; D016247:Information Storage and Retrieval / Q000379:methods*; D015233:Models, Statistical; D010363:Pattern Recognition, Automated / Q000379:methods*; D013223:Statistics as Topic