Patently Apple brings another interesting Apple proposal to our attention -- this one involving using the iPhone camera to detect swipes backward, forward, and the accelerometer to detect pause or play for things like Voice Mail without having to move the iPhone away from your ear. But that's not all:
Consider the following example of navigating the display screen. If the user wishes to scroll down on a webpage or text document, then the user would simply move their finger across the camera lens in an upward direction (i.e., towards the top of the screen 200). This would be consistent with moving the page "up" so as to bring a bottom portion of the page into view. To move the page down (and thereby bring a top portion of the page into view), the reverse needs to occur, i.e., the user needs to swipe across the lens in a downward direction. Note that navigation on the display screen (using a finger swipe across the camera lens) need not be limited to straight up and down, but rather could be performed in other or additional directions (e.g. left and right). Now that Apple is introducing "iBook" – think of flipping the page of a book using this method so that you don't even have to move your hands from the iPhone or future camera based iPad.
So now we've heard of case gestures, bevel gestures, and camera gestures... Of course Apple patents tons of stuff we haven't and may never see in real products, but are any of these starting to interest you?