Scale X and Y separately in a matrix

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

[Adam]

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]

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

Answer 1

[Adam]

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.