Raster-Scan Systems

➔ Interactive raster-graphics systems typically employ several processing units.

➔ In addition to the central processing unit (CPU), a special-purpose processor, called the video controller or display controller, is used to control the operation of the display device.

➔ Organization of a simple raster system is shown in below Figure.

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➔ Here, the frame buffer can be anywhere in the system memory, and the video controller accesses the frame buffer to refresh the screen.

➔ In addition to the video controller, raster systems employ other processors as coprocessors and accelerators to implement various graphics operations.