Sunday 4 January 2015

Difference between Raster and Vector Display


Characteristics
Raster Scan
Vector Scan
Working
In raster scanning, the beam sweeps horizontally left-to-right at a steady rate, then blanks and rapidly moves back to the left, where it turns back on and sweeps out the next line. During this time, the vertical position is also steadily increasing (downward), but much more slowly – there is one vertical sweep per image frame, but one horizontal sweep per line of resolution.
In Vector scan The electron beam follows an arbitrary path tracing the connected sloped lines. The beam skips over dark areas of the image without visiting their points.
Refresh rate
60 to 80 frames per second.
Depends upon image to be drawn.
Stores Picture Definition in
Refresh buffer or Frame buffer
Refresh Display file or Display Program
Image Drawing
Image is composed of glowing pixels.
Image is composed of drawn lines.
Can be used to draw complex drawings.
They can display only a shape’s outline.

Electron Beam
Electronic Beam is  directed to whole screen for drawing an image or object.
Electronic beam is directed to only part where image is to be drawn.
Price
Less Expensive
More Expensive
Image Quality
Good
Best

Related Terms:
Refresh Rate:
It is the number of times in a second that display hardware updates it buffer.
Pixel:
It is the smallest addressable element of a picture represented on the screen in a point addressable display device. It’s address correspondences to its physical co-ordinates.
Buffer:
It is the region for temporary storage on physical memory while data is being moved from one place to another.
Memory Buffer/Frame Buffer:
It is the portion of RAM that contains bitmap that is driven to a video display from a memory buffer containing a complete frame of data.
Film Frame: It is collection of many still images which compose the complete moving image. During moving picture is display, each frame is flashed on a screen for a short time (nowadays, usually 1/24, 1/25 or 1/30 of a second) and then immediately replaced by the next one.

This also Applies to:
Raster Vs Vector Scanning
Raster vs Vector Display Devices
Difference between Raster and Vector Display Devices
Differentiate between Raster and Vector Display Devices
Difference Between Raster and Random Scan Systems

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