Abstract: A video processor is responsive to an output of a pair of cameras that are used for determining a viewer viewing direction of a display screen. As long as the viewer's viewing angular direction is directed toward a center region of a display screen, the pan function is disabled. When the viewer's viewing angle crosses a first threshold angular direction away from the screen center, dynamically tracking pan function is enabled so as to shift the displayed picture. When the viewer's viewing angle crosses an even larger, second threshold angular direction, the picture will shift in the same direction but at a faster rate. When the viewer's viewing angular direction decreases in a manner to cross a threshold angular direction that is smaller than the first threshold angular direction further picture shift is suspended. Thereby, a hysteresis feature is incorporated.

Abstract: A video processor is responsive to an output of a pair of cameras that are used for determining a viewer viewing direction of a display screen. As long as the viewer's viewing angular direction is directed toward a center region of a display screen, the pan function is disabled. When the viewer's viewing angle crosses a first threshold angular direction away from the screen center, dynamically tracking pan function is enabled so as to shift the displayed picture. When the viewer's viewing angle crosses an even larger, second threshold angular direction, the picture will shift in the same direction but at a faster rate. When the viewer's viewing angular direction decreases in a manner to cross a threshold angular direction that is smaller than the first threshold angular direction further picture shift is suspended. Thereby, a hysteresis feature is incorporated.

Abstract: A video processor is responsive to an output of a pair of cameras that are used for detetermining a viewer viewing direction of a display screen. Once the viewer's viewing angle crosses a threshold angular direction dynamically tracking pan function is enabled so as to shift the displayed picture. An enhanced audio processor makes the perceived sources of sound produce in speakers dynamically follow the shifted picture. As the displayed image shifts by the dynamically tracking pan function, the locations from which the sound is perceived to originate also track the displayed image so that the stereophonic width dynamically varies in accordance with the stereoscopic width.