whats wrong with this nearest neighbor zoom code

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alireza kooshafar
alireza kooshafar 2016-10-22
评论： Image Analyst 2016-10-23
I think every thing is ok but the answer is not correct
I=imread('C:\Users\AliReza\Desktop\B.jpg');
for Channel = 1 : 3
I1 = I(:,:,Channel);
S=2 ;
[M , N]=size(I1);
M2=S*M;
N2=S*N;
I2=zeros(M2 , N2);
for i =1:M2
for j = 1:N2
x =i/S;
y=j/S;
x2=round(x);
y2=round(y);
if (x2<1)||(x2>M)||(y2<1)||(y2>N)
I2(i , j)=0;
else
I2(i,j)=I1(x2 ,y2);
end
end
I3(:, :, Channel) = I2;
end
imshow(I3,[])
  1 个评论
John D'Errico
John D'Errico 2016-10-22
What do you think is incorrect? Why do you think there is a problem? Perhaps you need to either learn to use the debugger, or you need to give more information if you seriously expect an answer.

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采纳的回答

Walter Roberson
Walter Roberson 2016-10-23
Change
I2=zeros(M2 , N2);
to
I2 = zeros(M2 , N2, class(I));

更多回答（1 个）

Image Analyst
Image Analyst 2016-10-22
Not sure what "is not correct" means. Perhaps you'd like to see the Mathworks demo on zooming an image, attached.
Or perhaps you want to use imresize() or imcrop().
  2 个评论
alireza kooshafar
alireza kooshafar 2016-10-23
dear image Analyst i write the code for gray and it works but when i want to do the same with rgb images just with adding channel i don't get the last result as i expected
Image Analyst
Image Analyst 2016-10-23
Looks like you've accepted Walter's answer so I assume you're all set now. Write back if that's not the case.

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