What is the comments given in this IWT code?
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Hello,
I am not able to read and understand the comments given in the following code.I got this from net and also not able to understand steps followed in this code.Please help me in this regard.
function y=IWT(x)
x=imread('lenna.gif');
subplot(2,3,1);imshow(x);title('ÔͼÏñ');
x=double(x);
y=x;
[hp,lp]=size(x);
hc=hp/2; lc=lp/2;
%----------------ÆæżÁÐÖØÅÅ
for n=1:lc
j=n*2-1;
y(:,n)=x(:,j);
y(:,lc+n)=x(:,j+1);
end
subplot(2,3,2);imshow(uint8(y)); title('ÆæżÁÐÖØÅÅ');
%-----------------ÐÐÖØÅÅ
for n=1:lc
y(:,lc+n)=y(:,lc+n)-y(:,n);
end
for n=1:lc
k=y(:,lc+n)/2-mod(y(:,lc+n)/2,1);
y(:,n)=y(:,n)+k;
end
subplot(2,3,3);imshow(uint8(y));title('ÐÐÖØÅÅ');
%---------------ÆæżÐÐÖØÅÅ
x=y;
for n=1:hc
j=n*2-1;
y(n,:)=x(j,:);
y(hc+n,:)=x(j+1,:);
end
subplot(2,3,4);imshow(uint8(y));title('ÆæżÐÐÖØÅÅ');
%---------------ÁÐÖØÅÅ
for n=1:hc
y(hc+n,:)=y(hc+n,:)-y(n,:);
end
for n=1:hc
k=y(hc+n,:)/2-mod(y(hc+n,:)/2,1);
y(n,:)=y(n,:)+k;
end
subplot(2,3,5);imshow(uint8(y));title('ÁÐÖØÅÅ');
%----------------Öظ´ÉÏÊö²½Ö裬½øÐжþ´ÎѹËõ
for n=1:lc
j=n*2-1;
y(:,n)=x(:,j);
y(:,lc+n)=x(:,j+1);
end
for n=1:lc
y(:,lc+n)=y(:,lc+n)-y(:,n);
end
for n=1:lc
k=y(:,lc+n)/2-mod(y(:,lc+n)/2,1);
y(:,n)=y(:,n)+k;
end
x=y;
for n=1:hc
j=n*2-1;
y(n,:)=x(j,:);
y(hc+n,:)=x(j+1,:);
end
for n=1:hc
y(hc+n,:)=y(hc+n,:)-y(n,:);
end
for n=1:hc
k=y(hc+n,:)/2-mod(y(hc+n,:)/2,1);
y(n,:)=y(n,:)+k;
end
%----------------ÔÙ½øÐÐÆæżÐÐÖØÅźÍÁÐÖØÅÅ
x=y;
for n=1:hc
j=n*2-1;
y(n,:)=x(j,:);
y(hc+n,:)=x(j+1,:);
end
for n=1:hc
y(hc+n,:)=y(hc+n,:)-y(n,:);
end
for n=1:hc
k=y(hc+n,:)/2-mod(y(hc+n,:)/2,1);
y(n,:)=y(n,:)+k;
end
subplot(2,3,6);imshow(uint8(y));title('¶þ´ÎѹËõ ');
5 Commenti
rizky alvarez
il 26 Feb 2021
hi sara and nur, so do i, i m still not understand waht the meaning on this code, have find the solution what is the meaning on this code ?
Walter Roberson
il 2 Mar 2021
Have you managed to find an original source for the code? (Something other than this post) ?
Risposte (2)
Wayne King
il 4 Mar 2013
Modificato: Wayne King
il 4 Mar 2013
I think you have to inquire with the individuals that provided this code.
Do you have the MathWorks Wavelet Toolbox? If so you can implement both the 2-D DWT and the inverse DWT using that Toolbox.
1 Commento
Wayne King
il 4 Mar 2013
Have you read the help for dwt2? You need to specify a wavelet name (or the filters) to use.
It's better to use wavedec2 because you can specify the level that you want.
wavedec2 uses dwt2.m internally but handles the iteration for you.
imdata = imread('ngc6543a.jpg');
[C,S] = wavedec2(imdata,3,'bior3.5');
4 Commenti
Deepika
il 20 Ott 2013
Hello Pooja, Mr. Wayne King is right. After that you should write imshow(). Then, you will get the what you want.
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