A class of M-channel linear-phase biorthogonal filter banks and their applications to subband coding

SC Chan*, A Nallanathan, TS Ng, PCK Kwok

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

This correspondence presents a new factorization for linear-phase biorthogonal perfect reconstruction (PR) FIR filter banks. Using this factorization. we propose a new family of lapped transform called the generalized lapped transform (GLT), Since the analysis and synthesis filters of the GLT are not restricted to he the time reverses of each other, they can offer more freedom to avoid blocking artifacts and improve coding gain in subband coding applications. The GLT is found to hare higher coding gain and smoother synthesis basis functions than the lapped orthogonal transform (LOT), Simulation results also demonstrated that the GLT has significantly less blocking artifacts, higher peak signal-to-noise ratio (PSNR). and better visual quality than the LOT in image coding, Simplified GLT with different complexity/performance tradeoff is also studied.

Original languageEnglish
Pages (from-to)564-571
Number of pages8
JournalIEEE Transactions on Signal Processing
Volume47
Issue number2
Publication statusPublished - Feb 1999

Keywords

  • filter banks
  • signal processing
  • transforms
  • LAPPED TRANSFORMS
  • FAST ALGORITHMS
  • FACTORIZATIONS

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