Computer graphics circuit

G - Physics – 06 – T

Patent

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G06T 15/50 (2006.01)

Patent

CA 2190938

In the Figure, a memory device (RAM) (1) stores cosLv[cos(Lh - Nh) - 1], a memory device (ROM) (2) stores cosNv, a memory device (RAM) (3) stores cos(Lv - Nv) and a memory device (ROM) (4) stores cosNh. The variable of the trigonometric function of each memory device 1 to 4 is one of Nh and Nv. Therefore, the individual memory devices require only a limited capacity that suffices the range of input variables. Adders (6a and 6b) output cos.theta. and cos.alpha., respectively. A multiplier (5c) produces a diffusion component by multiplying a coefficient Id by cos.theta.. A mirror surface component can be obtained after passing through a memory device (7) for generating cosn.alpha. using a mirror surface reflection factor n by the multiplication of a reflection coefficient Ir by a n multiplier (5d). Final brightness Ip is obtained by adding Id cos.theta. and Ir cosn.alpha. by an adder 6c.

Sur la figure, un composant mémoire (RAM) (1) mémorise cosLv[cos(Lh - Nh) - 1], un composant mémoire (ROM) (2) mémorise cosLv, un composant mémoire (RAM) (3) mémorise cos(Lv - Nv) et un composant mémoire (ROM) (4) mémorise cosNh. La variable de la fonction trigonométrique de chaque composant mémoire (1 à 4) est l'une ou l'autre de Nh et Nv. En conséquence, chaque composant mémoire pris individuellement nécessite seulement une capacité limitée qui est suffisante pour la plage des variables d'entrée. Les additionneurs (6a et 6b) fournissent respectivement cos.theta. et cos.alpha. à la sortie. Un multiplicateur (5c) produit une composante de diffusion en multipliant un coefficient Id par cos.theta.. Il est possible d'obtenir une composante de surface miroir après le passage dans un composant mémoire (7) afin d'obtenir cos?n¿.alpha. à l'aide d'un facteur de réflexion de surface miroir n en multipliant un coefficient de réflexion Ir avec un multiplicateur (5d). On obtient la luminosité finale Ip en ajoutant Id cos.theta. et Ir cos?n¿.alpha. par l'intermédiaire d'un additionneur (6c).

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