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Differentiate between random scan and raster scan techniques.

written 8.3 years ago by teamques10 ★ 68k

•   modified 8.3 years ago

Mumbai university > Comp > SEM 4 > Computer Graphics

Marks: 10M

Year: Dec 2014 , 2015

computer graphics

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written 8.3 years ago by teamques10 ★ 68k

-	Random scan	Raster scan
1	In random scan display the beam is moved,between the endpoints of the graphics primitives.	In raster scan display the beam is moved all over the screen one scan line at a time from top to bottom and then back to top.
2	Vector display flickers when the number of primitives in the buffer becomes too large.	In raster display, the refresh process is independent of the complexity of the image.
3	Scan conversion is not required.	Graphics primitives are specified in terms of,their endpoints and must be scan converted into their corresponding pixels in,the frame buffer.
4	Scan conversion hardware is not required.	Scan conversion hardware is required.
5	Random display draws a continuous and smooth line.	Raster display can display mathematically smooth lines, polygons and boundaries of curved primitives only by approximating them with pixels on the raster grid.
6	Cost is more.	Cost is less.
7	Vector display only draws lines and characters.	Raster display has ability to display areas,filled with solid colors or patterns.

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