Project for NDS to apply a Warhol filter to a picture of Zelda. The picture has been previously processed with Sobel operator. In fact, processing the image with Sobel operator was compulsory to get a better result.
You'll need devkitPro (at least devkitARM and libnds). You can use No$GBA, but I recommend DeSmuME as it can be linked to GDB.