need help in dwt2 ....

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Nizar Ahmad
Nizar Ahmad 2011-9-30
I had written this code to perform dwt2 on my image:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
clc;
clear all;
X=double(imread('Lena.bmp'));
X=fix(X);
[LL1,HL1,LH1,HH1]=dwt2(X,'bior1.1');
[LL2,HL2,LH2,HH2]=dwt2(LL1,'bior1.1');
[LL3,HL3,LH3,HH3]=dwt2(LL2,'bior1.1');
Y=[[[LL3,HL3;LH3,HH3],HL2;LH2,HH2],HL1;LH1,HH1];
Y=fix(Y);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
but it doesn't worked with me when I tried filter ('bior4.4') which I needed in my work help me plz...and thank you in advance..
note:
the error appears in the following lines:
[LL1,HL1,LH1,HH1]=dwt2(X,'bior4.4');
and
Y=[[[LL3,HL3;LH3,HH3],HL2;LH2,HH2],HL1;LH1,HH1];
  1 个评论
Nizar Ahmad
Nizar Ahmad 2011-10-2
thank you so much...I explain my need here:
I need to dwt2 in three levels and I am restricted to work on LLn
....any comments will be appreciated so much and thank you again.

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采纳的回答

Wayne King
Wayne King 2011-9-30
Hi, I think you are better off to use wavedec2 instead of iterating on the LL output with dwt2(). wavedec2() does that anyway.
load woman;
[C,S] = wavedec2(X,3,'bior4.4');
Then if you want to extract the details, detcoef2(), and appcoef2()
Or waverec2() to reconstruct projections.
If you really have some reason for iterating with dwt2(), please show the error you get.
Wayne

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