title: Affine invariants of convex polygons
abstract: In this correspondence, we prove that the affine invariants, for image registration and object recognition, proposed recently by Yang and Cohen (see ibid., vol.8, no.7, p.934-46, July 1999) are algebraically dependent. We show how to select an independent and complete set of the invariants. The use of this new set leads to a significant reduction of the computing complexity without decreasing the discrimination power
keyphrases: affine invariants convex polygons image registration object recognition algebraically dependent. invariants complexity reduction convex quadruplet feature vector