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An application of number theory to the organization of raster-graphics memory

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12 Author(s)

A high-resolution raster-graphics display is usually combined with processing power and a memory organization that facilitates basic graphics operations. For many applications, including interactive text processing, the ability to quickly move or copy small rectangles of pixels is essential. This paper proposes a novel organization of raster-graphics memory that permits all small rectangles to be moved efficiently. The memory organization is based on a doubly periodic assignment of pixels to M memory chips according to a "Fibonacci" lattice. The memory organization guarantees that if a rectilinearly oriented rectangle contains fewer than M/√5 pixels, then all pixels will reside in different memory chips, and thus can be accessed simultaneously. We also define a continuous amdogue of the problem which can be posed as, "What is the maximum density of a set of points in the plane such that no two points are contained in the interior of a rectilinearly oriented rectangle of area N." We give a lower bound of 1/2N on the density of such a set, and show that 1/√5N can be achieved.

Published in:

Foundations of Computer Science, 1982. SFCS '08. 23rd Annual Symposium on

Date of Conference:

3-5 Nov. 1982

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