Apple's U.S. Patent No. 8,593,564 for a "Digital camera including refocusable imaging mode adaptor," describes a method in which a user can take a picture at a certain resolution and refocus the resulting image after the fact. Also noted in the patent is the inclusion of such a system in portable devices, like an iPhone.
|Apple patents Lytro-like refocusable camera suitable for iPhone
The U.S. Patent and Trademark Office on Tuesday awarded Apple a patent for a camera system that uses a microlens adaptor to enable refocusing of an image after the initial shot is taken, much like the Lytro light-field camera.