Some of the features on the Samsung Galaxy S4 already use the phone's front-facing camera to monitor certain capabilities. For example, Smart Stay will freeze a video that you're watching if you turn your eyes away from the screen. With the new patent, a certain head movement will allow you turn a page on the screen. And any action that is set off by a head movement would require a nod to confirm. That would prevent you from accidentally setting oiff a feature with an unintentional gesture or movement of the head.
By the way, check out the super-thin bezels on the patent diagrams. Will this be a hint as to what to expect from the next iteration of Sammy's Android flagship? The latest buzz has the phone being launched by April, possibly containing an iris scanner.
Samsung's European patent hints at gesture controls for the Samsung Galaxy S5 using movements of the head
source: GalaxyClub (translate) via IntoMobile