Raster Scan Display In Computer Graphics | raster scan and random scan in computer graphics
#computergraphics #rasterscandisplay #computerscience
Raster Scan Display In Computer Graphics. Raster scan display is the most common type of display used in CRT televisions and monitors.
In a raster-scan system, the electron beam is swept across the screen, one row at a time from top to bottom.
As the beam is swept across the row, the beam intensity is turned on and off to create a pattern of illuminated spots.
Refresh buffer
The Picture definition that is to be drawn is stored in a memory area called the refresh buffer or frame buffer.
The refresh buffer holds the set of intensity values for all the screen points.
Stored intensity values are then retrieved from the refresh buffer and "painted" on the screen one row at a time.
Intensity range
In a simple black & white raster scan display, the intensity value is either is only 1 bit per pixel as it’s either on or off.
But in color raster scan display Up to 24 bits per pixel are included in high-quality systems.
In a black and white raster scan display system with 1 bit per pixel the frame buffer is called “BITMAP”.
Whereas in color system/multiple bit per pixel system the frame buffer is called “PIXMAP”.
REFRESH RATE
Refresh rate of raster scan display can be from 60 to 80 frames per second.
At the end of each scan line, the electron beam returns to the left side of the screen to begin displaying the next scan line which is known as “Horizontal retrace”
At the end of each frame the electron beam returns to the top left corner of the screen to display new frame.
This process is called “vertical retrace”.
ADVANTAGES of Raster scan display
We can display real life images which have different shades.
The color range available is way bigger than random scan display.
DISADVANTAGES of Raster scan display
The resolution is comparatively lower than random scan display.
High memory is required.
Data about intensities of all pixel over the screen has to be stored rather than only the area where picture is displayed.
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