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 scan1)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.
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.
Application of Raster scan display: Basically it is used in Plotters. and mainly more like....Printers,,,,
Scanning mode in which beam is scanning selected areas only; after scanning of selected area is completed beam is turned off and moved to another area to be scanned. It is also called Raster Scan Method.
Advantages of vector scan display include high resolution, smooth lines, and efficient use of memory. Disadvantages can include limited color capability, complexity in generating images, and susceptibility to distortion with complex shapes.
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Raster scan, or raster scanning: is the pattern of image detection and reconstruction in television, and is the pattern of image storage and transmission used in most computer image systems. The word raster comes from the Latin word for a rake, as the pattern left by a rake resembles the parallel lines of a scanning raster. Picture element: In a raster scan, an image is cut up into successive samples called pixels, or picture elements, along scan lines. Each scan line can be transmitted as it is read from the detector, as in television systems, or can be stored as a row of pixel values in an array in a computer system. On a television receiver or computer monitor, the scan line is turned back to a line across an image, in the same order. After each scan line, the position of the scan line is advanced, typically downward across the image in a process known as vertical scanning, and a next scan line is detected, transmitted, stored, retrieved, or displayed. This ordering of pixels by rows is known as raster order, or raster scan order.
Raster scan, or raster scanning: is the pattern of image detection and reconstruction in television, and is the pattern of image storage and transmission used in most computer image systems. The word raster comes from the Latin word for a rake, as the pattern left by a rake resembles the parallel lines of a scanning raster. Picture element:In a raster scan, an image is cut up into successive samples called pixels, or picture elements, along scan lines. Each scan line can be transmitted as it is read from the detector, as in television systems, or can be stored as a row of pixel values in an array in a computer system. On a television receiver or computer monitor, the scan line is turned back to a line across an image, in the same order. After each scan line, the position of the scan line is advanced, typically downward across the image in a process known as vertical scanning, and a next scan line is detected, transmitted, stored, retrieved, or displayed. This ordering of pixels by rows is known as raster order, or raster scan order.
In Raster scan display electron beam swept across the screen one row at a time from top to bottom.when reaches the bottom scan starts again from top.It produce a zig zag lines.
the difference is that scan is when your scanning some or something and skim is a thin layer of a substance on the surface of a liquid
Shadow MaskCommonly used in raster scan display.produce much wider range of color.picture quality is greater.Delta Shadow MaskCommonly used in color CRT system.produce less wider range of color.picture quality is less.
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