Aliasing :
- Aliasing is generation of a false (alias) frequency along with the correct one when doing frequency sampling .
- Ex: For images, this produces a jagged edge, or stair-step effect. For sound, it produces a buzz.
Anti-Aliasing :
- Anti-Aliasing means smoothing of the image or sound roughness caused by aliasing.
- Anti-Aliasing is a technique to reducing jaggies and stair-steps from signal.
Why Anti-Aliasing ?
- Because, The output devices like Monitor or Printer doesn't have high enough resolution to represent a smooth line.
How Anti-Aliasing working ?
- Anti-Aliasing reduces the Jaggies by surrounding the stair-steps with intermediate shades of gray on signal or aliased image or aliased image.
Examples :
