IAPRS, VOLUME XXXIV, PART 2, COMMISSION II, Xi' an, Aug.20-23,2002 Jingwei LI & Y 
ing 
—  — —— 
TH 
KEYWORDS 
ABSTRACT: 
The paper mac 
kinds of test d 
compare above 
quality. The m 
between the re 
doing image c 
given compres: 
Wavelets are 
different frec 
component wi 
Coding, Filter 
support the the 
the field of im; 
Fourier metho 
signal contaii 
shortening con 
by computer. 
image compre: 
or in dynastic 
Wavelets in th 
and is changin 
Today, the m: 
wavelet comp 
(DWT) techno 
described sim! 
1. The DW! 
with different 
coarse approxi 
2. The DW! 
which are as 
respectively, t 
bands. 
3. At the fir 
which is passe 
and double the 
of DWT coeff 
4. At the se 
is the output