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When operated as a random-scan display unit, a CRT has the electron beam directed only to the parts of the screen where a picture is to be drawn. Random-scan monitors draw a picture one line at a time and for this reason are also referred to as vector displays (or stroke-writing or calligraphic displays). The component lines of a picture can be drawn and refreshed by a random-scan system in any specified order (fig). A pen plotter operates in a similar way and is an example of a random-scan, hard-copy device. 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. Sometimes the refresh display file is called the display list, display program, or simply the refresh buffer. To display a specified picture, the system cycles through the set of commands in the display file, drawing each component line in turn. After all line-drawing commands have been processed, the system cycles back to the first line command in the list. Random-scan displays are designed to draw all the component lines of a picture 30 to 60 times each second. High-quality vector systems are capable of handling approximately 100,000 "short" lines at this refresh rate. When a small set of lines is to be displayed, each refresh cycle is delayed to avoid refresh rates greater than 60 frames per second. Otherwise, faster refreshing of the set of lines could burn out the phosphor. Random-scan systems are designed for line-drawing applications and can-not display realistic shaded scenes. Since picture definition is stored as a Set of line-drawing instructions and not as a set of intensity values for all screen points, vector displays generally have higher resolution than raster systems. Also, vector displays produce smooth line drawings because the CRT beam directly follows the line path. A raster system, in contrast, produces jagged lines that are plotted as discrete point sets. jackson francis malugala
computer engineer
DSM institute of technology
DAR ES SALAAM
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Define scan conversion using interlacing technique?
The process of representing continuous graphics object as a collection of discrete pixel is called Scan Convertion.
Where in use random scan?
plen plotter is most example of random scan display
What is interlacing in computer graphics?
'Interlacing' is a technique of improving the picture quality of a video signal primarily on crt devices without consuming extra bandwidth. In this technique ,each frame is displayed in two passes. In the first pass, the beam sweep across every other scan line from top to bottom. In second pass, the beam sweeps out the remaining scan lines.
Applications of random scan display system?
ecg
What is random scan display in CRTcomputer?
In random scan display the electron beam is directed only to the part of the screen where the picture is to be drawn. Random Scan monitor draw one picture at a time therefore they are also known as vector display.refersh rate or random scan system depends on the number of times to be displayed. Picture definition is stored in an area of memory called refresh display file.
Is raster scan displays same as bit-mapped displays?
raster scan display -based on television technology.where as random scan display based on hard copy devices.raster scan display cannot directly pass electron beam through the scan line..but random scan directed the beam toward the scan line.
How do random people get your phone number?
they put random numbers
How can I fix interlacing in Premiere?
To fix interlacing in Premiere, you can deinterlace the footage by right-clicking on the clip, selecting "Field Options," and choosing "Always Deinterlace." This will help eliminate the interlacing lines and create a smoother video output.
How does random scan display works?
it blows up your computer. SORCE i have shrapnal in my eye
What is the root word of interlacing?
The root word of interlacing is "lace." "Inter-" is a prefix added to "lace" to indicate the action of intertwining or weaving together.
What is the use of display file in random scan system?
Display File is a memory area which stores picture definition as a set of line drawing commands.Video controller interprets these commands and produces actual image on the screen.Display File in random scan system is comparable to frame buffer in raster scan system, on the basis of their functions.
What is the mean of scan traffic volume?
propagational behaviour of worms or programs which generate the traffic which consist of random internet ip address of vulnerable computer...is called scan traffic volume...generated by worms....!
