Re-sampling Images in Matlab

I want to re-sample the remotely sensed images which are usually very large from 30m to 15m.Does this simply means re-sizing it using imresize function or is their any other method for re-sampling such images in Matlab??

[Image Analyst]

What is m? Meters? Megapixels (usually designated MP)?

[Ankit Verma]

Sorry for the confusion it is meters not megapixels.

[Walter Roberson]

You want to re-sample from 30 meters resolution to 15 meters resolution? That is, you want to double the resolution of the images? Double _exactly_ ?

Answer 1

[Walter Roberson]

There are methods involving fft2() and ifft2(); there are methods involving wavelets; there are methods involving extracting subsections of the array; there are methods involving interp2(); there are probably other methods.

Myself, I would only bother to consider alternatives to imresize() if I was doing straight-forward half-resolution, or if I had more time (to do the programming) than I had money (to purchase the Image Processing Toolbox.)