How to retrieve pictures that have been deleted from an iphone?

I deleted pictures form my iphone 4s thinking I had saved them into my iphoto. Soon after I backed my phone up not knowing that my pictures were still in the itunes backup system. Is there any way that I could retrieve the pictures I lost?

If you have backed up before you deleted the pictures, just restore from iTunes backup files with iTunes.
1.Configure iTunes so that it does not automatically sync with your iPhone when your phone is connected to your computer
2.Connect your iPhone to the computer.
3.Open iTunes
4.Right-click on your device and press 'Restore from backup…'
By the time the restore is done.

Note: If your other files like new contacts, new messages that have not backed up would be rewritten.

If it works, can you give the best answer?