| 摘要 |
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.
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