How do you shrink multiple images without using imresize or imcrop?

I have to shrink 20 images to 129 x 120 without cutting off any of the image and without using imresize or imcrop.

Answer 1

[Image Analyst]

You could use interp2() or else just write your own code to do the same things as the functions you (for some reason) don't want to use.

[MK]

I am not allowed to use those functions on my homework assignment. Could you show me how to start the code for them?

[Image Analyst]

You could first figure out what coordinates in the input image the value should come from. Chances are it will land between 4 input pixels. So you can use bilinear interpolation.

See Wikipedia's page on bilinear interpolation