images !

[EDIT: Thu May 12 22:58:48 UTC 2011 Duplicate Removed - MKF]

i am working on a project named water marking using super resolution .. i want to ask a small question .. how can i take the photo size 256*256 (host image) .. resize it to make it 64*48 then put the resized image down the host image using NPT (logo image) .. so finally the host image will be resized to 256*244 and down it the logo image will be 64*48 ! please help me with its code !

[Walter Roberson]

What is NPT ?

Do I understand correctly that you will embed the watermarking image (64*48) in to the 256*256 image, and then that watermarked image will be resized to 256*244, and you wish to be able to extract the full 64*48 watermark from the resized image?

Is it known what resizing algorithm will be used? Will it be simple cropping, or will it be resizing changing the aspect ratio?

[Nada]

i want to rezise the (host) 256*256 to make it 64*48 .. then embed it to the bottom of the host image and that will make the host image 256*244 ..

it means we will resize the host image twice .. at first 64*48(down)

then 256*244(up) .. then embed them together

[Walter Roberson]

Normally when something is embedded, the image stays the same size.

To check: the final image you want to get out should be 256 x 256, but one edge of it should consist of a smaller version of original image?

I'm not sure what the purpose of this would be? I don't see what it has to do with superresolution for example.

[Nada]

hmmm .. fine !

all what i need is what u said !

a 256*256 image where its lower part is the same image but with smaller size 64*48 !

it is a task .. i really dunno how is it related to super resolution but it is a task ! any help with coding ??

[Nada]

clear

[A,map]=imread('lena256.bmp');

A=double(A);

[m,n]=size(A);

ps=zeros(12,256);

ips=1;

jps=1;

for i=1:8:m;

for j=1:8:n;

C=dct2(A(i:i+7,j:j+7));

DC=[1 1 0 0 0 0 0 0; 1 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;];

ps(ips,jps)=C(1,3);

ps(ips+1,jps)=C(2,2);

ps(ips+2,jps)=C(3,1);

C=C.*DC;

ips=ips+3;

if(ips>12)

jps=jps+1;

ips=1;

else

end

B(i:i+7,j:j+7)=C;

end

end

for i=1:8:m;

for j=1:8:n;

DD=B(i:i+7,j:j+7);

%DD=DD.*DC;

D(i:i+7,j:j+7)=idct2(DD);

end

end

figure(1)

imshow(A,map)

figure(2)

imshow(D,map)

ips=1;

jps=1;

for i=1:8:m;

for j=1:8:n;

DD=B(i:i+7,j:j+7);

DD(1,3)=ps(ips,jps);

DD(2,2)=ps(ips+1,jps);

DD(3,1)=ps(ips+2,jps);

ips=ips+3;

if(ips>12)

jps=jps+1;

ips=1;

else

end

D(i:i+7,j:j+7)=idct2(DD);

end

end

figure(3)

imshow(D,map)

i need to take figure 3 then do what i told u about !

Answer 1

[Sean de Wolski]

I = imread('cameraman.tif'); %sample
I(end-63:end,1:48) = imresize(I,[64 48]); %engine
imtool(I) %view

[Nada]

clear

[A,map]=imread('lena256.bmp');

A=double(A);

[m,n]=size(A);

ps=zeros(12,256);

ips=1;

jps=1;

for i=1:8:m;

for j=1:8:n;

C=dct2(A(i:i+7,j:j+7));

DC=[1 1 0 0 0 0 0 0; 1 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;0 0 0 0 0 0 0 0;];

ps(ips,jps)=C(1,3);

ps(ips+1,jps)=C(2,2);

ps(ips+2,jps)=C(3,1);

C=C.*DC;

ips=ips+3;

if(ips>12)

jps=jps+1;

ips=1;

else

end

B(i:i+7,j:j+7)=C;

end

end

for i=1:8:m;

for j=1:8:n;

DD=B(i:i+7,j:j+7);

%DD=DD.*DC;

D(i:i+7,j:j+7)=idct2(DD);

end

end

figure(1)

imshow(A,map)

figure(2)

imshow(D,map)

ips=1;

jps=1;

for i=1:8:m;

for j=1:8:n;

DD=B(i:i+7,j:j+7);

DD(1,3)=ps(ips,jps);

DD(2,2)=ps(ips+1,jps);

DD(3,1)=ps(ips+2,jps);

ips=ips+3;

if(ips>12)

jps=jps+1;

ips=1;

else

end

D(i:i+7,j:j+7)=idct2(DD);

end

end

figure(3)

imshow(D,map)

i need to take figure 3 and do what i wrote in the Q.

any help please??