Design of linear phase with unequal length paraunitary filter banks with suboptimal coding gain

A. Ochi, Y. Kobayashi, Masaaki Ikehara

    研究成果: Conference contribution

    抄録

    In this paper, we present a design of M-channel linear-phase paraunitary filter banks (LPPUFB), with filters of unequal lengths and same center of symmetry, (ULPPUFB) without using non-linear optimization algorithms. ULPPUFB can be viewed as generalized lapped orthogonal transforms (GenLOTs) with variable-length basis functions and are used in block transform-based image coding. ULPPUFB has long basis functions in order to avoid blocking artifacts, whereas it reserves short basis functions for high-frequency signal components like edges, thereby limiting ringing artifacts. The design of ULPPUFB has already been shown and can be expressed completely using a lattice structure. However, when it is used in image coding, the coding gain must be maximization, and then we must use non-linear optimization algorithms. When filter length or channel numbers are increased, non-linear optimization algorithms would necessitate an enormous amount of calculation. In this paper, we design each filter without using non-linear optimization, directly based on the compaction problem and implement ULPPUFB by changing these filters into lattice structures. Then, we show their validity.

    本文言語English
    ホスト出版物のタイトルIEEE Asia-Pacific Conference on Circuits and Systems, Proceedings, APCCAS
    出版社Institute of Electrical and Electronics Engineers Inc.
    ページ73-78
    ページ数6
    1
    ISBN(印刷版)0780376900
    DOI
    出版ステータスPublished - 2002
    イベントAsia-Pacific Conference on Circuits and Systems, APCCAS 2002 - Denpasar, Bali, Indonesia
    継続期間: 2002 10 282002 10 31

    Other

    OtherAsia-Pacific Conference on Circuits and Systems, APCCAS 2002
    CountryIndonesia
    CityDenpasar, Bali
    Period02/10/2802/10/31

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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