can u help me sir? I wanna source code for copy move forgery detection using dwt.

I need a help I want the source code for discrete wavelet transform can u help me plz?

[esmail alwrafi]

Maybe this will be a little helpful:

clc;
clear all;
close all;

x=imread('image.ext');
% subplot(6,6,1),
figure,imshow(x),title('orginal image');

[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;

% subplot(6,6,2),
figure,imshow(xa/200),title('xa/255');
% subplot(6,6,3),
figure,imshow(xh),title('H');
% subplot(6,6,4),
figure,imshow(xv),title('V');
% subplot(6,6,5),
figure,imshow(xd),title('D');

x1=[xa*0.003 log10(xv)*0.3; log10(xh)*0.3 log10(xd)*0.3];
% subplot(6,6,6),
imshow(x1),title('X1');

[r, c]=size(xa);
figure,imshow([r,c]),title('r,c)');
b=im2col(xa,[8 8],'sliding');
figure,imshow(b);

Answer 1

[Steven Lord]

Rather than write your own, consider using the dwt function from Wavelet Toolbox.

[Lana Lawran]

Thank u coz u answer me I have project in forgery detection and I have algorithm of dwt I want the code to understand some step in my algorithm and this step is:

1. read the image selected by user
2. if the input image is not gray converted
3. apply wavelet transform to specified level L
4. for each overlapping b*b block in the 'LL level:
5. 4.1.form a matrix A of definition b2 column and (M-b+1)×(N-b+1) rows by extracting the resulting pixel values by row in to row of A
6. 4.2. Form another matrix B same as A with two additional column for storing top left coordinate
7. end

can u help me in step 4 plz sir.

[charu shree]

Hi Lana, I can help you in this.

[vinay kumar]

hi could you send me the code for forgery detection by Wavelet transform

Thank you