Subband DCT: definition, analysis, and applications

Author

Jung, Sung-Hwan ; Mitra, Sanjit K. ; Mukherjee, Debargha

Author_Institution

Dept. of Comput. Sci., Changwon Nat. Univ., South Korea

Volume

6

Issue

3

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

273

Lastpage

286

Abstract

The discrete cosine transform (DCT) is well known for its highly efficient coding performance and is widely used in many image compression applications. However, in low bit rate coding, it produces undesirable block artifacts that are visually not pleasing. In addition, in many practical applications, faster computation and easier VLSI implementation of DCT coefficients are also important issues. The removal of the block artifacts and faster DCT computation are therefore of practical interest. In this paper, we investigate a modified DCT computation scheme, to be called the subband DCT (SB-DCT), that provides a simple, efficient solution to the reduction of the block artifacts while achieving faster computation. We have applied the new approach for the low bit rate coding and decoding of images. Simulation results on real images have verified the improved performance obtained using the proposed method over the standard JPEG method

Keywords

computational complexity; data compression; decoding; discrete cosine transforms; image coding; transform coding; VLSI implementation; analysis; applications; block artifacts; coding performance; decoding; definition; discrete cosine transform; faster DCT computation; image compression applications; low bit rate coding; simulation; subband DCT; Bit rate; Computational modeling; Decoding; Discrete cosine transforms; Discrete transforms; Image analysis; Image coding; Performance analysis; Signal processing algorithms; Transform coding;

fLanguage

English

Journal_Title

Circuits and Systems for Video Technology, IEEE Transactions on

Publisher

ieee

ISSN

1051-8215

Type

jour

DOI

10.1109/76.499836

Filename

499836