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By L. Szirmay-Kalos

Szirmay-Kalos L. (ed.) concept of 3-dimensional special effects (1995)(ISBN 9630569116)

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What happens if even F has too high complexity inhibiting its realization by an appropriate combinational circuit? The incremental concept might be applied to F as well, increasing the number of necessary temporary registers, but hopefully simplifying the combinatorial part, and that examination can also be repeated recursively if the result is not satisfactory. Finally, if this approach fails, we can turn to the simpli cation of the algorithm, or can select a di erent algorithm altogether. Generally, the derivation of F requires heuristics, the careful examination and possibly the transformation of the mathematical de nition or the computer program of f (k).

This point can be that with the smallest x-coordinate, for example. Let 34 2. ALGORITHMICS FOR IMAGE GENERATION it be denoted by p 1 . This point is de nitely a vertex of the convex hull. Then a direction vector d~ is set so that the line having this direction and going through p 1 is a supporting line of the convex hull, that is, it does not intersect its interior. With the above choice for p 1 , the direction of d~ can be the direction pointing vertically downwards. The next vertex of the convex hull, p 2 , can then be found by searching for that point p 2 fp ; : : : ; p gn p 1 for which the angle between the direction of d~ and the direction of p~1 p is minimal.

In other words, the color is determined by the frequency spectrum of the incoming light. Due to its internal structure, the eye is a very poor spectrometer since it actually samples and integrates the energy in three overlapping frequency ranges by three types of photopigments according to a widely accepted (but also argued) model of the eye. As a consequence of this, any color perception can be represented by a point in a three-dimensional space, making it possible to de ne color perception by three scalars (called tristimulus values) instead of complete functions.

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