Name
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');
Authors
Roger Liu and Isaac Zhi