A low complexity overcomplete directional image pyramid
Jose Gerardo Rosiles, Mark J. T. Smith · 2004
An undecimated directional filter bank (UDFB) derived from the DFB originally proposed by Bamberger and Smith is proposed. The new UDFB has excellent orientation selectivity, and maintains the low computational complexity from its predecessor. While over complete, the UDFB presents other properties like shift invariance, desirable for some image analysis applications. Using ladder structures the overall directional response is readily controlled by 1D prototypes which are easy to design. We combine the UDFB with over complete pyramidal structures to form directional pyramids with excellent radial and directional selectivity.