Can anyone help me to solve my last line matlab error? When I use haar transfrom, it works perfect, but when I use db2, the last figure could not come, please help.

clear all; close all;

a=imread('fauzia.jpg');

x=imresize(a,[1024 1024]);

[xar,xhr,xvr,xdr]=dwt2(x(:,:,1),'db2');

[xag,xhg,xvg,xdg]=dwt2(x(:,:,2),'db2');

[xab,xhb,xvb,xdb]=dwt2(x(:,:,3),'db2');

xa(:,:,1)=xar;xa(:,:,2)=xag;xa(:,:,3)=xab;

xh(:,:,1)=xhr;xh(:,:,2)=xhg;xh(:,:,3)=xhb;

xv(:,:,1)=xvr;xv(:,:,2)=xvg;xv(:,:,3)=xvb;

xd(:,:,1)=xdr;xd(:,:,2)=xdg;xd(:,:,3)=xdb;

figure,imshow(xa/255);

figure,imshow(xh);

figure,imshow(xv);

figure,imshow(xd);

x1=[xa*0.003 log10(xv)*0.3;log10(xh)*0.3 log10(xd)*0.3];

figure;imshow(x1)

[xaar,xhhr,xvvr,xddr]=dwt2(xa(:,:,1),'db2');

[xaag,xhhg,xvvg,xddg]=dwt2(xa(:,:,2),'db2');

[xaab,xhhb,xvvb,xddb]=dwt2(xa(:,:,3),'db2');

xaa(:,:,1)=xaar;xaa(:,:,2)=xaag;xaa(:,:,3)=xaab;

xhh(:,:,1)=xhhr;xhh(:,:,2)=xhhg;xhh(:,:,3)=xhhb;

xvv(:,:,1)=xvvr;xvv(:,:,2)=xvvg;xvv(:,:,3)=xvvb;

xdd(:,:,1)=xddr;xdd(:,:,2)=xddg;xdd(:,:,3)=xddb;

figure,imshow(xaa/255);

figure,imshow(xhh);

figure,imshow(xvv);

figure,imshow(xdd);

x11=[xaa*0.001 log10(xvv)*0.3;log10(xhh)*0.3 log10(xdd)*0.3];

figure;imshow(x11)

[r,c,s] = size(xv);

figure;imshow([x11(1:r,1:c,:) xv*0.05; xh*0.05 xd*0.05])

[xaaar,xhhhr,xvvvr,xdddr]=dwt2(xaa(:,:,1),'db2');

[xaaag,xhhhg,xvvvg,xdddg]=dwt2(xaa(:,:,2),'db2');

[xaaab,xhhhb,xvvvb,xdddb]=dwt2(xaa(:,:,3),'db2');

xaaa(:,:,1)=xaaar;xaaa(:,:,2)=xaaag;xaaa(:,:,3)=xaaab;

xhhh(:,:,1)=xhhhr;xhhh(:,:,2)=xhhhg;xhhh(:,:,3)=xhhhb;

xvvv(:,:,1)=xvvvr;xvvv(:,:,2)=xvvvg;xvvv(:,:,3)=xvvvb;

xddd(:,:,1)=xdddr;xddd(:,:,2)=xdddg;xddd(:,:,3)=xdddb;

figure,imshow(xaaa/255);

figure,imshow(xhhh);

figure,imshow(xvvv);

figure,imshow(xddd);

x111=[xaaa*0.001 log10(xvvv)*0.3;log10(xhhh)*0.3 log10(xddd)*0.3];

figure,imshow(x111);

[r,c,s] = size(xvv);

figure;imshow([[x111(1:r,1:c,:) xvv*0.05; xhh*0.05 xdd*0.05] xv*0.05; xh*0.05 xd*0.05]);

Answer 1

[KALYAN ACHARJYA]

It's the issue with concanatation (Dimention Mismatch) , Here I have choosen one test image to check. Lets simply to get the issue

a2=xvv*0.05; %258x258x3
a3=xhh*0.05; %258x258x3
a4=xdd*0.05; %258x258x3
a5=xv*0.05;  %258x258x3
a6=xh*0.05;  %258x258x3
a7=xd*0.05;  %258x258x3
a=[a1 a2; a3 a4]; %516x516x3
result=[a a5;a6 a7];

See the dimention mismatch with a, hence it shows the error, pleasse do modify, so that concanatation works

[Fauzia Yasmeen]

yes its the issue with concatenation as the error said that. what you suggested, i have a question

a2=xvv*0.05; %258x258x3

a3=xhh*0.05; %258x258x3

a4=xdd*0.05; %258x258x3

a5=xv*0.05; %258x258x3

a6=xh*0.05; %258x258x3

a7=xd*0.05; %258x258x3

a=[a1 a2; a3 a4]; %516x516x3

result=[a a5;a6 a7];

In the above code, a5, a6 and a7 is the 1 level dwt and we get 258*258*3, ok

But if we again apply dwt on a1, then a2, a3 and a4 should be 128*128*3???

I have done 3 level DWT, if i use haar instead of db2, the last line code works, but in db2, it didnt work.could you please recheck??

[Fauzia Yasmeen]

could you please run my whole code and help me to solve the issue?