You can't view them in your gallery or anything?
Install QuickPic and verify whether or not your pictures are still on your phone.
If yes, than your photos should be located in sdcard/DCIM/Camera. You have multiple ways to copy them to your computer. The more common way would be to use KIES (google: Samsung Kies Download to install), but you could select them all with QuickPic and email them to yourself, upload them to Google+ or flickr or Picasa, transfers them to your physical Sdcard (ExtSDcard) with a file explorer like Astro than toss it into your PC, download them with Wifi File Explorer, ect.
Sent From My Rooted/Modded SGSIII - If I've helped you please click 'Thanks'!