DCT-based general structure for linear-phase paraunitary filterbanks

Author

Liang, Jie ; Tran, Trac D. ; De Queiroz, Ricardo L.

Author_Institution

Dept. of Electr. & Computer Eng., Johns Hopkins Univ., Baltimore, MD, USA

Volume

51

Issue

6

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1572

Lastpage

1580

Abstract

In this paper, we present a general structure for linear phase paraunitary filterbanks (LPPUFB) via both time-domain pre-processing and frequency-domain post-processing of the discrete cosine transform (DCT). The proposed structure not only covers existing frameworks with either pre-processing or post-processing of the DCT but enables the design of DCT-based LPPUFB with both partial-block overlapping and variable-length filters as well. Some high-performance and low-complexity transforms can be obtained by fine-tuning the structure parameters. Furthermore, a DCT-oriented initialization method is developed to improve the convergence and to simplify,the parameterization in the filterbank optimization process. The application in image compression is demonstrated.

Keywords

channel bank filters; data compression; discrete cosine transforms; frequency-domain analysis; image coding; optimisation; time-domain analysis; DCT-based general structure; LPPUFB; convergence; discrete cosine transform; filterbank optimization process; frequency-domain post-processing; image compression; linear-phase paraunitary filterbanks; structure parameters; time-domain pre-processing; variable-length filters; Convergence; Discrete cosine transforms; Discrete transforms; Helium; Image coding; Lattices; Nonlinear filters; Optimization methods; Time domain analysis; Video compression;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/TSP.2003.811224

Filename

1200146