IEEE Trans Image Process - Nonuniform directional filter banks with arbitrary frequency partitioning.

Tópicos

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Resumo

Directional filter banks (DFBs) are highly desired in directional representation of images. In this correspondence, we propose a 2-D nonsubsampled nonuniform directional filter bank (NUDFB) and its design method. The proposed NUDFB has nonuniform wedge-shaped subbands and allows arbitrary frequency partitioning schemes. It can extract directional information according to the directional distribution of images. This attractive advantage cannot be achieved by the existing directional transforms. The design method of the proposed NUDFB is based upon the pseudopolar Fourier transform. By utilizing the geometry property of the pseudopolar grid, we employ a 1-D nonsubsampled nonuniform filter bank to obtain a set of nonuniform wedge-shaped subbands. During the design process, only 1-D operations are involved and, thus, the difficulty encountered in the design of 2-D fan filters is avoided. To demonstrate the potential of the proposed NUDFB, an example on image directional decomposition is given.

Resumo Limpo

direct filter bank dfbs high desir direct represent imag correspond propos d nonsubsampl nonuniform direct filter bank nudfb design method propos nudfb nonuniform wedgeshap subband allow arbitrari frequenc partit scheme can extract direct inform accord direct distribut imag attract advantag achiev exist direct transform design method propos nudfb base upon pseudopolar fourier transform util geometri properti pseudopolar grid employ d nonsubsampl nonuniform filter bank obtain set nonuniform wedgeshap subband design process d oper involv thus difficulti encount design d fan filter avoid demonstr potenti propos nudfb exampl imag direct decomposit given

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