Image comparison (need to resize, convert to binary and compare similar image result)

Question

hi, i work on image comparison where focus ob basic geometric shape (rectangle, square, circle). i'm totally new to this language, i really need help...

i need to:
1) resize the image to 16x16 pixels
2)convert the image to binary (0's or 1's)
3) and compute it using algorithm.

i already search sample source code for conversion and image comparison. but still have the problem, and yet still does not know how to resize the read image to size 16x16 pixels.

if anybody can help me? i'm really appreciate,