Image display method

An image display method in which an image to be presented is displayed on an apparatus having a CRT display screen and memory means for storing data, said method comprising the steps of:

• (a) entering into the memory means, picture information defining the image to presented;
• (b) entering into the memory means, a horizontal dimension L.sub.x and a vertical dimension L.sub.y of the image to be presented;
• (c) storing lengths B.sub.x, B.sub.y of the horizontal and vertical direction of the display screen in the memory means said lengths corresponding to a display area in said memory means;
• (d) calculating a magnification K based upon said lengths B.sub.x, B.sub.y as well as said dimensions L.sub.x, L.sub.y ;
• (e) multiplying said picture information defining the image to be presented by the magnification factor K;
• (f) obtaining starting point coordinate values (X.sub.s, Y.sub.s) within said memory means of the image to be presented following multiplication thereof by K;
• (g) specifying starting point coordinate values (X.sub.s ', Y.sub.s ') within said display area of said memory means of the desired location of the image on the display screen;
• (h) calculating shift quantities S.sub.x, S.sub.y for the horizontal and vertical directions based upon the coordinate values (X.sub.s, Y.sub.s), (X.sub.s ', Y.sub.s ') of both starting points;
• and
• (i) displaying the complete image on the CRT display screen by using said picture information, said starting point coordinate values, said magnification factor and the shift quantities.