DocumentCode
1332716
Title
On the step response of the DCT
Author
Andrew, J.P. ; Ogunbona, P.O.
Author_Institution
Dept. of Electr. & Comput. Eng., Wollongong Univ., NSW, Australia
Volume
44
Issue
3
fYear
1997
fDate
3/1/1997 12:00:00 AM
Firstpage
260
Lastpage
262
Abstract
We show that the discrete cosine transform (DCT) is the best orthogonal transform, in terms of energy packing efficiency, for coding input steps of uniformly distributed random phase. Over sufficiently small block sizes, edges in an image can be modeled as such step inputs. This characteristic of the DCT, coupled with its high energy packing efficiency for highly correlated data, helps explain the impressive performance of the DCT for image compression
Keywords
data compression; discrete cosine transforms; image coding; step response; DCT; block transform; coding; correlated data; discrete cosine transform; edge model; energy packing efficiency; image compression; orthogonal transform; random phase; step response; Circuits; Decorrelation; Digital signal processing; Discrete cosine transforms; Discrete transforms; Finite impulse response filter; Image coding; Karhunen-Loeve transforms;
fLanguage
English
Journal_Title
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
Publisher
ieee
ISSN
1057-7130
Type
jour
DOI
10.1109/82.558462
Filename
558462
Link To Document