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A General‐Purpose Multi‐Microprocessor Raster Graphics Display System with Anti‐Aliasing

The raster graphics display system described represents a general purpose mini‐computer, specially for CAD applications. The system is based on a hierarchical asynchronous multiple microprocessor system. In practice this mini‐computer is extendable up to 15–20 workstations. On the workstations, different graphical and non‐graphical devices can be connected. The most interesting workstation is a raster graphics display device which was developed specially for the computer system described. This raster graphics display device contains a processor for the application program, two dedicated processors and two separate identical frame buffers, each of them containing one whole set of image data. Applying algorithms for anti‐aliasing, virtual pixel dislocation (intensity dislocation) and multi‐pixel‐overlappings with hidden line (surface) elimination the image readability and quality can be increased considerably. In particular the paper deals with an anti‐aliasing algorithm with a real‐time hardware realization.