Image drawing device, image drawing method, and providing...

G - Physics – 06 – T

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G06T 15/00 (2006.01) G06T 11/00 (2006.01) G06T 15/10 (2006.01)

Patent

CA 2292508

Aliasing is reduced by the image drawing method of this invention. A plurality of amounts of shift by which the drawing positions of when the RGB values of each pixel are written in a frame buffer are shifted with a precision minuter than one pixel are determined, and the RGB values are written in the respective positions in the frame buffer corresponding to the amounts of shift to overwrite an image. As shown in Figure 7, the point whose coordinates are (1.6, 1.3) is written in the pixel (1, 1) at the first image drawing (Figure 7(A)), written in the pixel (2, 1) at the second image drawing (Figure 7(B)), written in the pixel (2, 1) at the third image drawing (Figure 7(C)), and written in the pixel (1, 1) at the fourth drawing (Figure 7(D)).

Le procédé de tracé d'images de l'invention permet d'atténuer le crénelage. Pour ce faire, on détermine une pluralité de valeurs de décalage utilisées pour décaler les positions du tracé lorsque les valeurs RVB de chaque pixel sont écrites dans un tampon d'images avec une précision supérieure à un pixel, et les valeurs RVB sont écrites au niveau de positions respectives du tampon d'images correspondant aux valeurs de décalage permettant d'écraser une image. Comme l'illustre la Figure 7, le point de coordonnées (1,6, 1,3) est écrit dans le pixel (1, 1) au cours du premier tracé (Fig. 7 (A)) d'image, écrit dans le pixel (2, 1) au cours du second tracé (Fig. 7 (B)) d'image, écrit dans le pixel (2, 1) au cours du troisième tracé (Fig. 7 (C)) d'image, et écrit dans le pixel (1, 1) au niveau du quatrième tracé (Fig. 7 (D)).

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