What is Raster-scan technique? - Graphics

What is Raster-scan technique?

- Electron beam is swept across the computer screen.

- The beam sweeps one row at a time from top to bottom.

- The intensity of beam is turned on and off as the electron beam moves across every row.

- Picture is defined in the memory area known as refresh buffer.

- The memory area holds a group of intensity values.

- These intensity values are set for every screen point.

- Raster scan refreshing displays 60 – 80 frames per second.