How can I enhance the image resolution?

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Elena 2014-7-28

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评论： Anindya Banerjee 2018-9-18

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

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Patrik Ek 2014-7-28

There is some support for resampling in matlab. Eg resample it could be worth if the resolution is important

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Joseph Cheng 2014-7-28

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编辑：Joseph Cheng 2014-7-28

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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.

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Joseph Cheng 2014-7-28

Yup exactly, i don't think the G3 implemented it exactly like the Lytro is what i was saying.

Elena 2014-7-29

The command "imresize" solved my problem! Thank you very much!

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Ben11 2014-7-28

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编辑：Ben11 2014-7-28

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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)