How do I resize a binary image?
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I tried using imresize but it is not showing the image I sent in. The white pixels are no longer there and I just have a blank black background. Thank you.
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Accepted Answer
Walter Roberson
on 10 May 2013
imresize(double(OriginalImage), .....)
It might be meaningful to convert back to binary afterwards.
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Walter Roberson
on 10 May 2013
Maybe when they said "binary" they didn't mean 0's and 1's; maybe they meant it more in the sense of the data was loaded from a "binary file" instead of from a "text file". Or perhaps somehow it got to be uint8(0) and uint8(1) ?
If the original data is 0's and 1's but is not single() or double() or logical(), then applying double() to the data would work.
More Answers (1)
Josep Llobet
on 6 Aug 2021
Hi there,
Values in the resized image change to non-binary. Then, you can simply turn to binarize the image for filter the values and turn to have a binary image:
I_BW = imread("hands1-mask.png");
%class(I_BW) % <- to see the type of image
I_BW_resize = imresize(double(I_BW), 2);
%unique(I_BW_resize) % <- to see the diferent values (-0.1659, -0.1564, -0.1516...)
%size(I_BW_resize)
I_BW_resize = imbinarize(I_BW_resize);
imshowpair(I_BW, I_BW_resize, "montage");
%size(I_BW_resize)
%unique(I_BW_resize) % <- to see the diferent values (1, 0)
With the MATLAB app Image Viewer. Using the button
you can see the pixel values. For call the app you can do as the example:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/704727/image.png)
imtool(I_BW_resize)
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