Novel characteristics of even-stacked cosine-modulated filter banks: Non-redundant directional transform and shift-invariance

Seisuke Kyochi, Masaaki Ikehara

    Research output: Contribution to journalConference article

    Abstract

    In this paper, we present non-redundant directional transform and shift-invariant transform based on even-stacked cosine-modulated filter banks (ECFBs). M-band dual-tree wavelet transform (MDTWT) recently proposed has rich directional selectivity and near shift-invariance. However, it has two problems. First, it is not critically-sampled transform. Second, it cannot achieve shiftinvariance at all decomposition levels. For these problems, we show a solution based on ECFBs. Critically-sampled ECFBs provide non-redundant transform with rich directional selectivity. Furthermore, oversampled ECFBs with oversampling ratio of 2 can assure the shift-invariance at any decomposition levels. Moreover, ECFBs can be designed from only one prototype filter and guarantee linear phase. In this paper, we verify these facts by theoretical analysis and simulations. copyright by EURASIP.

    Original languageEnglish
    JournalEuropean Signal Processing Conference
    Publication statusPublished - 2008 Dec 1
    Event16th European Signal Processing Conference, EUSIPCO 2008 - Lausanne, Switzerland
    Duration: 2008 Aug 252008 Aug 29

    ASJC Scopus subject areas

    • Signal Processing
    • Electrical and Electronic Engineering

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