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Line smoothing for a raster display

  • US 4,591,844 A
  • Filed: 12/27/1982
  • Issued: 05/27/1986
  • Est. Priority Date: 12/27/1982
  • Status: Expired due to Term
First Claim
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1. A display system for smoothing out stair-step effects in the raster display of information having line segments, said display system comprising:

  • a raster scanned display including a surface having a plurality of pixels for displaying information to a viewer; and

    a display generator for generating video signals to control said display in displaying line segments, said display generator including;

    (a) a brightness generator responsive to input signals for dividing each line segment to be displayed into a plurality of sections each made up of one or more pixels and for determining individual brightness values of said pixels in proportion to the amount of surface area of those of said pixels in each section overlaid by said line segment to be displayed,(b) a memory,(c) means responsive to pixel address signals for addressing said memory to store said pixel brightness values in memory locations associated with each said pixel of each section, and(d) a video sequence generator for addressing said memory in a predetermined sequence to retrieve said pixel brightness values pursuant to the generation of said video signals to said raster display.

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