manual bilinear and nearest neighbor interpolation

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tilak tenneti
tilak tenneti 2014-11-10
编辑： Image Analyst 2014-11-10
Hi , i am trying to perform nearest neighbor and bilinear interpolation on a 512*512 image to convert into 1024*1024 as well as 768*768 . i got some code but not able to proceed further with errors such as "undefined function for input argument double" please help me to convert to 1024*1024 as well as 768*768 without using imresize
here is the following code and attached is the image
inputI= imread('lenatest3.jpg');
[r c] = size(inputI);
scale=2;
for i=1: scale *r
for j=1: scale *c
% map from output image location to input image location by nearest neighbor
ii = round( (i-1)*(r-1)/( scale *r-1)+1 );
jj = round( (j-1)*(c-1)/( scale *c-1)+1 );
% assign value
nni(i,j) = inputI(ii,jj);
end
end
% bilinear
scale=2;
blin=uint8(zeros(r*scale,c*scale));
for i=1:1:size(blin,1)-scale
for j=1:1:size(blin,2)-scale
A=im(ceil(i/scale),ceil(j/scale));
B=im(ceil(i/scale)+1,ceil(j/scale));
C=im(ceil(i/scale),ceil(j/scale)+1);
D=im(ceil(i/scale)+1,ceil(j/scale)+1);
ii=mod(i-1,scale)/scale;
jj=mod(j-1,scale)/scale;
blin(i,j)=A+ii*(B-A)+jj*(C-A+ii*(D+A-C-B));
end
end

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回答（1 个）

Image Analyst
Image Analyst 2014-11-10
Don't do any of that. Simply call imresize().
  2 个评论
tilak tenneti
tilak tenneti 2014-11-10
thank you sir but as a task of my work i am required to do the manual task of achieving bilinear and nearest neighbor without using imresize().
any help would be appreciated
thanks
Image Analyst
Image Analyst 2014-11-10
编辑：Image Analyst 2014-11-10
Why? Is this homework? You didn't tag it as homework. How about interp2()? Or is that not allowed either? Maybe I'll have time to look at it later....

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