memory devices can be disposed inside or outside the processor device pe u2014 components whose basic operation in conjunction with a processor device will be sufficiently well known to a person skilled in the art and which therefore will not be described in greater detail here there is additionally provided an input element ee which can be implemented by a so called four direction switch a joystick a touchpad a trackball or equivalent items to display a window framing an image or an image segment there is provided a display dpl on which there is displayed on the window superimposed on the image segment or alongside the window in addition to a marker or pointer m a first display element format which reproduces the format e g portrait or landscape of the entire image to be displayed in addition the display dpl is used to display a second display element a portion of which zoom is highlighted the portion being selected as a function of the current zoom factor of the representation of the image segment the highlighted portion increases for example linearly with the zoom factor a third display element pos is used to display the position of the displayed image segment within the overall image the position of the third display element relative to a reference point of the first display element being determined by the position of the marker display relative to a reference point of the image the different components of the system can exchange data with the processor cpu via a bus system bus or input output interfaces.