Design of a tree-structured bank with allpass polyphase filters for subband image coding via time-frequency localization

Takeshi Nomura, Yoshitaka Morikawa, Nobumoto Yamane

Research output: Contribution to journalArticle

Abstract

We discuss the optimization of filter coefficients in a tree-structured bank with allpass polyphase filters for subband image coding. First we show that the impulse response length and cutoff characteristics of the filter bank have a tradeoff relationship in terms of coding performance. Then we propose a method of designing a bank by minimizing the product △n△w between the time and bandwidths of subband filters. Amplitude responses of the designed subband filters nearly approximate Gaussian functions and their △n△w are little larger than the lower bound of the uncertainty principle. Coding simulations show that the coding performance of the designed bank compares favorably with that of image-optimized banks.

Original languageEnglish
Pages (from-to)1168-1175
Number of pages8
JournalKyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers
Volume53
Issue number8
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Media Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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