What is the comments given in this IWT code?

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Pooja
Pooja 2013-3-4
评论： Walter Roberson 2021-3-2
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('ԭͼÏñ');
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 个评论
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rizky alvarez
rizky alvarez 2021-2-26
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
Walter Roberson 2021-3-2
@rizky alvarez
Have you managed to find an original source for the code? (Something other than this post) ?

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回答（2 个）

Wayne King
Wayne King 2013-3-4
编辑：Wayne King 2013-3-4
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 个评论
Pooja
Pooja 2013-3-4
编辑：Walter Roberson 2017-8-12
Hello,
There is no identity of the author.`when i gave code like this i got o/p in this form
x=imread('lena.bmp');
y=dwt2(x)
o/p -Error in ==> Untitled5 at 2
y=dwt2(x)
??? Error using ==> dwt2 at 55
Not enough input arguments.
What is the problem?

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Wayne King
Wayne King 2013-3-4
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 个评论
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Pooja
Pooja 2013-5-6
how to show the image after this step [C,S] = wavedec2(imdata,3,'bior3.5');
I wanted to show the image with three level decompostion.
Deepika
Deepika 2013-10-20
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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