(19)
(11) EP 0 439 714 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.1992 Bulletin 1992/14

(43) Date of publication A2:
07.08.1991 Bulletin 1991/32

(21) Application number: 90122594.6

(22) Date of filing: 27.11.1990
(51) International Patent Classification (IPC)5: G09G 1/14
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 05.01.1990 US 461342

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

(72) Inventor:
  • Williamson, Willie, Jr.
    Sacramento, California 95820 (US)

(74) Representative: Teufel, Fritz, Dipl.-Phys. 
IBM Deutschland Informationssysteme GmbH, Patentwesen und Urheberrecht
70548 Stuttgart
70548 Stuttgart (DE)


(56) References cited: : 
   
       


    (54) Anti-aliasing method for graphic display


    (57) A method for determining the values of pixels in a resulting image having a greater number of pixels than an original image describes a technique for calculating the values of the new pixels in the resulting image. A rectangular region centered on a junction of four pixels in the original image is used as the basis for calculation. This rectangular region contains one-fourth of the adjacent original pixels, and is divided into 8 triangular regions. All of the pixels of the resulting image within a triangular region are given the same color, and the color assigned to the pixels in each such triangular region is a function of the colors of the four adjacent pixels in the original image.






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