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<p><b>Abstract</b>—The trace transform is a generalization of the Radon transform that allows one to construct image features that are invariant to a chosen group of image transformations. In this paper, we propose a methodology and appropriate functionals that can be computed from the image function and which can be used to calculate features invariant to the group of affine transforms. We demonstrate the usefulness of the constructed image descriptors in retrieving images from an image database and compare it with relevant state-of-the-art object retrieval methods.</p>
Affine invariance, object identification, image databases.

M. Petrou and A. Kadyrov, "Affine Invariant Features from the Trace Transform," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 26, no. , pp. 30-44, 2004.
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