Abstract: A system for storing an image of an object to be identified and for retrieving the stored image of the object for displaying the same on a display screen. The system includes electronic scanner for scanning the object on a line-to-line basis to provide an analog signal for each line indicative of the information content of said object. The analog information is converted by a digitizer into pixels which define a matrix which matrix determines the information content for each line. A window area is generated which area encompasses a predetermined area within a larger display area. The window area is used to generate and to respond to a first set of digital information which information is derived from the matrix pixels. This first set of digital information is such that the window area contains a limited number of pixels plus a limited number of lines, each of which is generated when the window area is scanned.