There are several applications of the raster and random. Such applications are common in raster scan system, raster scan generator and many more.
RASTER:-* raster display have less resolution *decrease memory cost have made raster system popular *display or capturing a video line by line Random :-* random displays have high quality resolution *random scan system's are generally much expensive
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.
Define briefly raster scan system
what are the advantages of randon scan and raster scan? what is flat panel display
Raster-scan:-q1) Raster displays have less resolution.q2) The lines producced are ziz-zag as the plotted values are discrete.q3) High degree realism is achived in picture with the aid of advanced shading and hidden surface technique.q4) Decreasing memory costs have made raster systems popular.Random scan:-q1) Random displays have high resolutions since the picture definition is stored as a set of line drawing commands and not as a set of intensity values.q2) Smooth lines are produced as the electron beam directly follows the line path.q3) Realism is difficult to achieve.q4) Random-scan system's are generally costlier.
Advantages of Random scan display:1)high resolution2)produce smooth line drawings.Disadvantages of random scan display:1)costlier2)just does wire frame.3)complex scene cause visible flicker.Advantages of raster scan display:1)decreasing memory costs have made raster systems popular.2)high degree realism is achieved in picture with the aid of advanced shading and hidden surface technique.3)Computer monitors and TVs use this methodDisadvantages of Raster scan display:1)the lines produced are zigzag as the plotted values are discrete.2)resolution is low.
Raster scan is based on television technology. In this the electron beam is swept across the screen, one row at a time 4m top to bottom, which creates a pattern of illuminated spots. When a CRT is operated as random scan display unit 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 called as vector display.
Application of Raster scan display: Basically it is used in Plotters. and mainly more like....Printers,,,,
Raster-scan system:-1)raster displays have less resolution. 2)the lines producced are ziz-zag as the plotted values are discrete.3)high degree realism is achived in picture with the aid of advanced shading and hidden surface technique.4)decreasing memory costs have made raster systems popular.Random scan system:-1)random displays have high resolutions since the picture definition is stored as a set of line drawing commands and not as a set of intensity values. 2)smooth lines are produced as the electron beam directly follows the line path.3)realism is difficult to achieve.4)random-scan system's are generally costlier.
example of raster scane disply
In raster scan display, the electron beam is swept across the screen, one row at a time from top to bottom.Random scan monitors draw a picture one line at a time and so they are also referred to as vector displays.Refreshing on raster scan display is carried out at the rate of 60 to 80- frames per second. Refresh rate on a random scan system depends on the number of lines to be displayed.The picture definition is stored in a memory area called refresh buffer or frame buffer in case of a raster scan display. In case of random scan display, picture definition is stored as a set of line-drawing commands in an area of memory referred to as the refresh display file. Refresh display file is also called the display list, display program, or the refresh buffer.