How can I enhance the image resolution?

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Hi,
I use the "imread" command to read an image from the file. The result is a two-dimensional matrix with M rows and N columns. For example my image has M = 2505 and N = 2713 by default. But I would like to decide the number of sample in which the image will be divided. Is it possible to set the M and N values, which will represent the image?
Many thanks in advance,
Regards,
Elena
  1 Comment
Patrik Ek
Patrik Ek on 28 Jul 2014
There is some support for resampling in matlab. Eg resample it could be worth if the resolution is important

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Accepted Answer

Joseph Cheng
Joseph Cheng on 28 Jul 2014
Edited: Joseph Cheng on 28 Jul 2014
Your question seems a bit confusing or misguided. You are saying you have 2505 by 2713 image file (lets just say *.bmp, *.jpg, *.tif, etc.)and you are trying to open it as a 5010 by 5426 as an example or magnification for enhancement? Then you would want to try imresize() that is used in the image processing toolbox.
I = imread('circuit.tif');
J = imresize(I,[100 150]);
imshow(I)
figure, imshow(J)
However you'll not get more data out of it for an enhancement of the resolution of the data. You'll have to take the image at a higher resolution. imresize will interpolate the data with different interpolation methods. in the documentation imresize will use the nearest neighbor interpolation to come up with the new image.
  9 Comments
Elena
Elena on 29 Jul 2014
The command "imresize" solved my problem! Thank you very much!

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More Answers (1)

Ben11
Ben11 on 28 Jul 2014
Edited: Ben11 on 28 Jul 2014
Yes you can. You can select the range of pixels like this:
A = imread('peppers.png');
size(A) % get the size of your image, in your case its 2505x2713
ans =
384 512 3
B = A(100:300,200:400,:); % select the part of the image you want to display. Note that it does not increase the resolution though.
subplot(2,1,1);imshow(A);subplot(2,1,2);imshow(B)
Giving this:
Is this what you meant?
  3 Comments
Anindya Banerjee
Anindya Banerjee on 18 Sep 2018
@ben11 can you please tell me how you assigned the numbers to select the parts to be displayed?? ( B = A(100:300,200:400,:) )

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