Performance evaluation of subband coding and optimization of its filter coefficients

Jiro Katto*, Yasuhiko Yasuda

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

In this paper, two analytical methods for evaluating the coding efficiency of subband coding are proposed, and optimization of filter coefficients of the perfect reconstruction FIR filter banks is considered, based on a new performance measure called unified coding gain. First, matrix representation of the subband coding in the time domain is considered, and conventional subband filter banks are classified into orthogonal ones such as the QMF and nonorthogonal ones such as the SSKF. For the orthogonal filter banks, the coding gain shown by Jayant and Noll is introduced, and their theoretical performance evaluation is carried out. However, this first method cannot be applied to nonorthogonal filter banks any longer because the coding gain is defined on the assumption of filter orthogonality. Therefore, an optimum bit allocation problem for subband coding is considered, and the unified coding gain, which can be applied to arbitrary subband filter banks, is derived as a new performance measure to take the place of the coding gain. This second method enables us to estimate the coding efficiency of arbitrary transform techniques as well as the subband approaches, and its result suggests that the SSKF(5 × 3) outperforms the QMF as long as the number of subbands is not too large, even though its filter length is much shorter. This result encourages us to find filter coefficients that maximize the unified coding gain according to filter length. In addition, new perfect reconstruction FIR filter banks which have not only low computational complexity but also good energy compaction properties are presented.

本文言語English
ページ(範囲)303-313
ページ数11
ジャーナルJournal of Visual Communication and Image Representation
2
4
DOI
出版ステータスPublished - 1991 12
外部発表はい

ASJC Scopus subject areas

  • 信号処理
  • メディア記述
  • コンピュータ ビジョンおよびパターン認識
  • 電子工学および電気工学

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