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Displaying or capturing a video image line by line. Computer Monitors and TVs use this method whereby electrons are beamed (scanned) onto the phosphor coating on the screen a line at a time from left to right starting at the top-left corner. At the end of the line, the beam is turned off and moved back to the left and down one line, which is known as the "horizontal retrace." When the bottom-right corner is reached, the gun is returned to the top-left corner, known as the "vertical retrace." For TV signals, these "flyback" periods in which the electron beam is moved to a different line are also called the "horizontal" and "vertical blanking intervals."

Video Is the Reverse

Capturing video images uses the same raster scan sequence as the display, but in reverse. Instead of sending electrons to a material that creates light, light is directed to a material that holds a charge, and the charge is turned into an electronic signal. The first video cameras used a vacuum tube with a light-sensitive plate at one end. Subsequently, CCD and CMOS chips replaced the tube. See charitable-remainder-trust, charge-coupled-deviceand rasterize-technology.Raster Scan Tracing

Starting at the top-left of the screen and going to the bottom-right, the electron beam is turned on a line at a time (1), then turned off to go back to the next line (2), then off once again to go back up to the top (3)

Read more: horizontal-flyback

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12y ago
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14y ago

Rasterisation is the task of taking an image described in a vector graphics format (shapes) and converting it into a raster image (pixels or dots) for output on a video display or printer, or for storage in a bitmap file format.

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Q: What do you mean by raster scan random scan?
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What are the difference between raster scan system and random scan system?

Raster-scan system:-1)raster displays have less resolution. 2)the lines produced 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.5)In this case, the electron beam is swept across the screen, one row at a time from top to bottom.6)Picture definition is stored in a memory area called the refresh buffer/frame buffer.7)Refreshing on raster scan displays is carried out at the rate of 60 to 80 frames/second.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.5)Here CRT has the electron beam directly only to the parts of the screen where a picture is to be drawn.6)Picture definition is stored as a set of line drawing commands in an area of memory referred to as refresh display file.7)Random scan systems are designed to draw all the component lines of a picture 30 to 60 times each second.


What does random mean in science terms?

random in science terms means random duhhh. :) random is random in every language or subjects


What does it mean when someone calls you random?

it means your weird


Does miscellaneous mean random?

no der ta der. jk!:) yes it does


What a sentence for scan?

when I and my mom went to market she scan the foods

Related questions

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.


What are the relative advantages and disadvantages of random scan and raster scan display system?

Raster-scan system:-1)raster displays have less resolutio. 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.


What are the applications of raster scan graphics?

Application of Raster scan display: Basically it is used in Plotters. and mainly more like....Printers,,,,


Example of raster display and random display?

example of raster scane disply


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.


Compare the merits and demerits of raster and random scanning system?

Raster-scan system:-1)raster displays have less resolution.2)the lines produced 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.5)In this case, the electron beam is swept across the screen, one row at a time from top to bottom.6)Picture definition is stored in a memory area called the refresh buffer/frame buffer.7)Refreshing on raster scan displays is carried out at the rate of 60 to 80 frames/second. 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.5)Here CRT has the electron beam directly only to the parts of the screen where a picture is to be drawn.6)Picture definition is stored as a set of line drawing commands in an area of memory referred to as refresh display file.7)Random scan systems are designed to draw all the component lines of a picture 30 to 60 times each second.


Advantages of raster scan?

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.


What is a raster scan system What is a picture element how it is?

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.


What are the various characteristics of raster scan?

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.


Difference between raster scan CRT and vector scan CRT?

Raster-scan1)raster displays have less resolutio. 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.


What are the characteristics of raster scan system?

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.


What are the difference between raster scan system and random scan system?

Raster-scan system:-1)raster displays have less resolution. 2)the lines produced 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.5)In this case, the electron beam is swept across the screen, one row at a time from top to bottom.6)Picture definition is stored in a memory area called the refresh buffer/frame buffer.7)Refreshing on raster scan displays is carried out at the rate of 60 to 80 frames/second.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.5)Here CRT has the electron beam directly only to the parts of the screen where a picture is to be drawn.6)Picture definition is stored as a set of line drawing commands in an area of memory referred to as refresh display file.7)Random scan systems are designed to draw all the component lines of a picture 30 to 60 times each second.