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S
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Scale X and Y separately in a matrix

Asked by S
on 16 Jul 2019
Latest activity Edited by Adam
on 17 Jul 2019
Hi,
I have a matrix of an image. I want to scale the x axis of the matrix by keeping y the same. (Like stretch the image only in X keeping Y the same). I'm thinking of using the aspect ratio (X/Y). But by multiplying the whole matrix by the aspect ratio doesn't give the result I want. Is there a way to do this.
Thanks

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Adam
on 16 Jul 2019
doc interp2
will allow you to change the sizes of x and y independently. Just use the same y grid for output as you did for input and choose your new x grid to be what you want.
Or just
doc imresize
should work, unless I am misunderstanding what result you are expecting.
S
on 16 Jul 2019
In doc imresize the whole image is stretched or srink, right? Can it be used to stretch only x axis and keep y axis the same. Could you please send me an example code.
Thank you very much

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1 Answer

Answer by Adam
on 17 Jul 2019
Edited by Adam
on 17 Jul 2019

B = imresize(A,[numrows numcols])
is the second syntax given in the documentation. If you pass in a numrows the same as the current size of A then this will remain unchanged in B, while the number of columns can change independently of this.

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