Patent ID: 7855714

Claim:
A method for controlling the display of a portable electronic device having a camera function; the portable electronic device including a light-sensitive transducer for receiving a first image and a trackball for use as a user-input device; the method comprising: setting a default zoom level; activating a viewfinder by generating a second image on the display that corresponds to the first image; the second image having a field of view that corresponds to the default zoom level; receiving rolling input from the trackball; the input representing an instruction either to zoom-in to or zoom-out from the field of view; adjusting the zoom level based on whether the instruction indicated zoom-in or zoom-out; regenerating the second image, on the viewfinder, with an enlarged or reduced field of view according to the zoom level from the adjusting; receiving an input from the trackball corresponding to the trackball being depressed; and capturing at least a portion of the first image, the portion corresponding to the second image within the viewfinder according to the zoom level.