Watch the Video Demo :
If you want get photos (camera roll, photo library) back after deleting them from iphone 4, you can use Dr.Fone (iPhone 4) to directly scan and recover lost photos from your iPhone 4. This video shows you how to recover photos within three steps. Just watch the video demo.
Dr.Fone iPhone 4 (for Windows users) :
Data Recovery for iTunes (for Mac users) :