Scilab Wavelet Toolbox Function
Last update : June 2007
dwt2 - Two Dimensional Discrete Fast Wavelet Transform
Calling Sequence
-
[CA,CH,CV,CD]=dwt2(x,wname,['mode',extMethod])
-
[CA,CH,CV,CD]=dwt2(x,Lo_D,Hi_D,['mode',extMethod])
Parameters
-
wname
: wavelet name
-
x
: double matrix
-
Lo_D
: lowpass analysis filter
-
Hi_D
: highpass analysis filter
-
extMethod
: extension mode, 'zpd' for example
-
CA
: approximation coefficent
-
CH
: horizontal detail coefficent
-
CV
: vertical detail coefficent
-
CD
: diagonal detail coefficent
Description
dwt2 is for two dimension discrete fast wavelet transform with the signal extension method optional argument.
Examples
x=rand(100,100);
[CA,CH,CV,CD]=dwt2(x,'db2','mode','asymh');
Author
Roger Liu and Isaac Zhi
See Also
idwt2
,