Aliasing:
. Jagged edge or stair-step effect on smooth line.. It is found in images and sound.
Causes:
. Sampling rate < 2(Max Frequency).. Resolution of output device is low.
Antialiasing:
. Technique to reduce jaggies and make line smooth.. In sound processing, we use antialiasing filter before sampling.
How to achieve Antialiasing?
. Increase sampling rates.. Blur edges.
Types of Antialiasing:
| Name | Working | Result |
|---|---|---|
| Super Sample Antialising (SSAA) | Downsamples high resoultion images | Smoother edge |
| Multi Sample Antialiasing (MSAA) | Takes parts of image and process | Smoother edge |
| Adaptive Antialiasing | Extension to MSAA | Works with alpha/ transparent text |
| Coverage Sampling Antialiasing (CSAA) | Increases number of samples | Higher quality MSAA |
| Enhanced Quality Antialiasing (EQAA) | Increases number of samples | Higher quality MSAA |
| Fast Approximate Antialiasing (FXAA) | Detects edges in frame and blurres it | Faster, less hardware, smooths out edges |
| Temporal Antialiasing (TXAA) | Implementation varies from game to game | Improved result over FXAA |
Applications :
. Optical Image Sampling
. PhotoShop
. Audio applications
. Gaming applications
. Digital Photography
