Generalized Linear-Phase Paraunitary Nonuniform Filter Banks

Yuhiro Kobayashi, Masahiro Kawada, Masaaki Ikehara

Research output: Contribution to journalArticle

Abstract

Uniform filter banks such as the DCT used in JPEG and MPEG have been studied widely. On the other hand, the frequency characteristics of the signal have irregularity. The wavelet transform makes use of such characteristics in nonuniform processing. However, the conventional nonuniform filter banks are constructed with a tree structure of identical two-channel filter banks. Since the frequency characteristic of each subband filter cannot be designed directly, such a filter bank may not be optimum with regard to the coding efficiency. In the present paper, a method of configuration of generalized linear-phase paraunitary nonuniform filter banks is presented. A realization using a lattice structure that preserves orthogonality and the linearphase property is proposed. Finally, the obtained nonuniform filter bank is applied to image coding and the effectiveness of the proposed method is confirmed.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalElectronics and Communications in Japan, Part III: Fundamental Electronic Science (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume87
Issue number4
DOIs
Publication statusPublished - 2004 Apr

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Filter banks
Image coding
Wavelet transforms
Processing

Keywords

  • Filter bank
  • Image coding
  • Linear phase
  • Nonuniform division
  • Paraunitary

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

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AB - Uniform filter banks such as the DCT used in JPEG and MPEG have been studied widely. On the other hand, the frequency characteristics of the signal have irregularity. The wavelet transform makes use of such characteristics in nonuniform processing. However, the conventional nonuniform filter banks are constructed with a tree structure of identical two-channel filter banks. Since the frequency characteristic of each subband filter cannot be designed directly, such a filter bank may not be optimum with regard to the coding efficiency. In the present paper, a method of configuration of generalized linear-phase paraunitary nonuniform filter banks is presented. A realization using a lattice structure that preserves orthogonality and the linearphase property is proposed. Finally, the obtained nonuniform filter bank is applied to image coding and the effectiveness of the proposed method is confirmed.

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