(19)
(11) EP 0 337 752 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.11.1991 Bulletin 1991/47

(43) Date of publication A2:
18.10.1989 Bulletin 1989/42

(21) Application number: 89303602.0

(22) Date of filing: 12.04.1989
(51) International Patent Classification (IPC)4: G09G 1/16
(84) Designated Contracting States:
DE FR GB

(30) Priority: 15.04.1988 JP 91913/88

(71) Applicant: International Business Machines Corporation
Armonk, N.Y. 10504 (US)

(72) Inventors:
  • Aoki, Yutaka
    Fujisawa-shi Kanagawa-ken (JP)
  • Takayanagi, Kazunori
    Sagamihara-shi Kanagawa-ken (JP)

(74) Representative: Burt, Roger James, Dr. et al
IBM United Kingdom Limited Intellectual Property Department Hursley Park
Winchester Hampshire SO21 2JN
Winchester Hampshire SO21 2JN (GB)


(56) References cited: : 
   
       


    (54) Graphic display system for cutting out partial image


    (57) A graphic display system in which a raster driven display screen (24) receives input signals from a storage device (10). Means (12) are provided to define the outline of a portion of an image and then to generate a mask (14) which is overlaid on the signals in the storage device so that only the signals representing the portion of the image inside the outline are displayed on the screen.







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