The picture is then stored in an area of memory which is referred to as the frame buffer or refresh buffer.This motion is referred to as Vertical retrace. As a particular frame ends, the beam of electron moves to the left top corner of the screen to move to another frame.This motion is known as Horizontal retrace. When each scan of the line is refreshed it returns to the left side of the screen. As the beam of electron moves through each row, its intensity is alternatively turned on and off which helps to create a pattern of spots that are illuminated.It moves from top to bottom considering one row at a time. In this system, a beam of an electron is moved across the screen.Image source: Basic working of Raster Scan Raster can be explained as a rectangular collection of dots or points plotted.Īn image is subdivided into various horizontal lines which are referred to as scan lines which are then further divided into different pixels which helps in the processing of an image. Submitted by Monika Sharma, on April 07, 2020 Computer Graphics | Raster Scan and Random Scan Display: In this tutorial, we are going to learn about the Raster Scan and Random Scan Display in Computer Graphics, these Scanning methods, and we will also learn each of them in detail.
