How can I resample an image in matlab?

2013 11 15
3 个回答
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更新时间：2013 11 16
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0 个投票

Hello
I want to resample an image in matlab. I use imresample code of by Omer Demirkaya. but I have bellow error.
  • | |Error using griddedInterpolantSample values must be a single or double array.
Error in interp2/makegriddedinterp (line 214) F = griddedInterpolant(varargin{:});
Error in interp2 (line 135) F = makegriddedinterp(X, Y, V, method,extrap);
Error in imresample (line 49) nimg(:,:,i) = interp2(Ox,Oy,img(:,:,i),Nx,Ny,intmethod);| | *
Could you help me how can I resample an image?
Thanks for your help.

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 采纳的回答

Walter Roberson
Walter Roberson 2013-11-15

2 个投票

Before you start the interpolation, do
img = im2double(img);

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bkshn
bkshn 2013-11-15
Hello Walter Roberson
Thanks for your answer I have another question, Could you answer me, I'll appreciate your help. I do resampling and done an algorithm on my Image, right now I want to return resampled image to first image(I want to undo resampling), what can I d0? I resample my image by this
NI = imresample([0.2,0.2],I,[1,1],'linear');
I want to undo resampling by this
NI2 = imresample([1,1],NI,[0.2,0.2],'linear');
but It didn't work!
Walter Roberson
Walter Roberson 2013-11-15
What happens instead of it "working" ?
bkshn
bkshn 2013-11-16
编辑：bkshn 2013-11-16
I found my answer thanks alot for your help

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更多回答（2 个）

Alex Taylor
Alex Taylor 2013-11-15

0 个投票

The MATLAB interpolation functions require that the inputs be floating point, since interpolation is a floating point operation. Walter's comment is accurate, if you want to interpolate in double precision floating point, im2double will work.
To Image Analyst's point: are you trying to apply a geometric transformation like scaling, rotating, or a generic affine transformation to an image? If so, it would be easier to look at imresize, imrotate, or imwarp if you have the Image Processing Toolbox. These will take care of the resampling for you.

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