Question

Distinguish between Raster and Random scan display.

Answer 1

Raster Scan SystemRandom Scan SystemResolution

It has poor orless Resolutionbecause picture definition is stored as a intensity value.It has High Resolutionbecause it stores picture definition as a set of line commands.Electron-Beam

Electron Beam is directed from top to bottom and one row at a time on screen, but electron beam is directed to whole screen.Electron Beam is directed to only that part of screen where picture is required to be drawn, one line at a time so also called Vector Display.Cost

It is less expensivethan Random Scan System.It is Costlierthan Raster Scan System.Refresh RateRefresh rate is 60 to 80 frame per second.Refresh Rate depends on the number of lines to be displayed i.e 30 to 60 times per second.Picture DefinitionIt Stores picture definition in Refresh Buffer also called Frame Buffer.It Stores picture definition as a set of line commandscalled Refresh Display File.Line DrawingZig – Zag line is produced because plotted value are discrete.Smooth line is produced because directly the line path is followed by electron beam .Realism in displayIt contains shadow, advance shading and hidden surface technique so gives the realistic display of scenes.It does not contain shadow and hidden surface technique so it can not give realistic display of scenes.Image DrawingIt uses Pixelsalong scan lines for drawing an image.It is designed for line drawing applications and uses various mathematical function to draw.

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Answer 2

Explanation:

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