1. A method comprising sending to a handheld device that has a display, a digital video frame that has an original pixel resolution, and a region of interest, the display of the handheld device having a substantially lower pixel resolution than the original pixel resolution of the digital video frame, and also sending to the handheld device a directive that is associated with the region of interest and from which the hand-held device can display the region of interest at the original pixel resolution and centered in the display of the handheld device, without the handheld device requiring any other information about the shape of the region of interest.