SNo. |
|
Raster Scan System |
Random Scan System |
1 |
Resolution |
Poor Resolution because picture definition is stored at intensity level. |
High resolution because picture definition stored at command level. |
2 |
Electron Beam |
Electron beam moves from top to bottom one row at a time. |
Electron beam moves to part of screen to be drawn. Also called vector display system. |
3 |
Cost |
Less expensive |
Costlier as compared to raster scan. |
4 |
Refresh Rate |
Usually 60 to 80 frames per second. Refresh rate is independent of picture complexity. |
Depends on no. of lines to be drawn i.e. 30 to 60 times per second. Refresh rate depends directly on picture complexity.
|
5 |
Picture Definition |
Stores picture details in Frame buffer |
Stores details as separate vector commands in refresh display file. |
6 |
Line Drawing |
Zig Zag lines are displayed since plotted values are discrete. |
Smooth lines drawn as line drawing follows mathematical functions. |
7 |
Realism in Display |
Gives realistic display scenes because shading and hidden surface techniques. |
Does not give realistic scenes. |
8 |
Image Drawing |
Uses pixels as scan lines to display image. |
Uses mathematical functions to draw. |
9 |
Interlacing |
Uses interlacing |
Doesn't use interlacing |
10 |
Editing |
Editing is difficult since one need to manipulate frame buffer. |
Editing is easy since picture details are commands. |
No comments