document: Affine invariants of convex polygons In this correspondence , we prove that the affine invariants , for image registration and object recognition , proposed recently by Yang and Cohen -LRB- see ibid. , vol .8 , no. 7 , p.934-46 , July 1999 -RRB- 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
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