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Show continuous function desired. This sampling action makes CHAPTER 7 ELIMINATION OF RASTERING EFFECTS ... ,imagine ancient Babylon in the seventh centure B.C. with its straight brick-paved avenues and vaulted sewers extending in a straight line over several square miles of land. And let's assume that the bricks are all identical and laid in one continuous system throughout, exactly, fitted end to end and side to side, and that the same bricks form the foundations of all the houses from the Ishtar Gate to the famous Tower of Babel. Guy Murchie Music of the Spheres Digital display devices used to present the results of :omputer image generation consist of a rectangular array of identically shaped picture elements, each of which may be set to any computed intensity value. The true nature of an image of some object in the real world, however, is a continuous function of X and Y. The image produced by a computer program then consists of a array of samples of the possible a variety of undesirable -visual artifacts. To understand how these come about and how to reduce or eliminate them we turn to the subject of digital signal processing. |
