%0 Journal Article %J IEEE Signal Processing Letters %D 2006 %T Rotational Invariant Operators based on Steerable Filter Banks %A X. Shi %A Ribeiro-Castro, A.L. %A Roberto Manduchi %A R. Montgomery %B IEEE Signal Processing Letters %V 13 %U http://users.soe.ucsc.edu/~manduchi/papers/SPpaperRV-2cols.pdf