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Due to which fading of display of object may occur. In Interlaced scanning, each horizontal line of the screen is traced from top to bottom. Types of Scanning or travelling of beam in Raster Scan Then it will again more horizontally from top to bottom call as horizontal retracing shown in fig: When the beam starts from the top left corner and reaches the bottom right scale, it will again return to the top left side called at vertical retrace.
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First is horizontal retracing and second is vertical retracing. In Frame Buffer the positions are called picture elements or pixels. Raster Scan provides a refresh rate of 60 to 80 frames per second.įrame Buffer is also known as Raster or bit map. The raster scan system can store information of each pixel position, so it is suitable for realistic display of objects. Televisions in our house are based on Raster Scan Method. Information of on and off pixels is stored in refresh buffer or Frame buffer.