Re: image resizing

[Søren Hauberg]

fre, 24 07 2009 kl. 16:15 +0530, skrev Anwesha Dastidar (Trainee):
> I am a beginner in image processing techniques. I have been trying to
> resize a 20x46 bmp image to 32x32 bmp image in Octave. I used the
> imresize command but it distorts the shape of the object.
> 
> How do I resize without distorting the image?

I am not sure I understand. You wish to convert a 20x46 image into a
32x32. You really can't avoid changing the aspect ratio, which I guess
is what you mean with 'distortion'. You can crop the image to avoid this
(see below).

> Also, is there any command available in Octave which allows us to crop
> an image? (equivalent to imcrop() in Matlab which is undefined in
> Octave)

To crop an image you can do something like

  new_im = old_im (10:20, 1:20);

where the coordinates depend on how you wish to crop. You can use
'ginput' to get coordinates.

Søren
>