Explain architecture of raster graphic system with display processor?

Answer 1

In random scan display, also called vector scan display,stroke writing or calligraphic.The electron beam directly draw the picture i.e. draw a picture one line at a time.Random scan monitor sketch the picture using vector line.

Refresh rate on a random scan system depends on the number of lines to be displayed.Picture definition is now stored as a set of line drawing commands.In an area of memory referred to as the refresh display file is called the display list,display program or simply the Refresh Buffer.

Random scan display systems are designed for line design applications and cannot display realistic shaded scene.Since,picture definition is stored as a set of lines drawing instructions and not as a set of intensity values for all screen pixels.Vector display generally have a higher resolutions than raster scan.Also vector display produce smooth line drawings.

ADVANTAGES:

1. Very high resolution, limited only by monitor.

2.Easy animation, just draw at different positions.

3.Required little memory.

DISADVANTAGES:

1.Requires intelligent electron beam i.e. processor controlled.

2.Limited speed density before have flicker.

3.Cannot draw a complex image.

4.Limited color capability(very expansive).