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What is Anti-aliasing?

What is Anti-aliasing: Here, we are going to learn what does Anti-aliasing stands for? Anti-aliasing – which is an abbreviation in Computer Acronyms/Abbreviations, etc.
Submitted by Anushree Goswami, on March 22, 2020

Anti-aliasing

Anti-aliasing may allude to any of a variety of systems of practices to put an end to the issues or crisis of aliasing in a sampled signal such as a digital image or digital audio recording.

A variety of systems of practices of anti-aliasing comprise:

Anti-aliasing filter

  1. An anti-aliasing filter (AAF) is a filter used before a signal sampler to limit the bandwidth of a signal to just about or persuade the Nyquist–Shannon sampling theorem above the band of interest.
  2. In the sight of the fact that the theorem states that an explicit reconstruction of the signal from its samples is probable in a condition when the power of frequencies over the Nyquist frequency is zero, a real anti-aliasing filter exchanges between bandwidth and aliasing.
  3. A realizable anti-aliasing filter will normally either allow several aliasing to take place or else satisfy several in-band frequencies close to the Nyquist limit. Due to this, a variety of realistic systems sample advanced than would be supposedly necessary by an ideal AAF in an arrangement to make sure that all frequencies of interest can be restructured and modernized a system of practice called oversampling.

Spatial anti-aliasing

In digital signal processing, spatial anti-aliasing is a system of practice for reducing the deformation work of art known as aliasing when representing a high-resolution image at a lower resolution. Anti-aliasing is used in digital photography, computer graphics, digital audio, and a lot of additional applications.

Anti-aliasing means taking away or eliminating signal elements that have a higher frequency than can be appropriately determined by the recording (or sampling) device. This taking away or elimination is completed before (re)sampling at a lower resolution.

Types of Spatial anti-aliasing are:

  1. Multi-sample anti-aliasing (MSAA): It is a type of spatial anti-aliasing, a system of practice used in computer graphics to enhance image quality.
  2. Supersampling: It is a spatial anti-aliasing system of practice, in other words, a technique used to take away or eliminate aliasing from images provided in computer games or other computer programs that produce imagery.

Fast approximate anti-aliasing (FXAA)

It is an anti-aliasing algorithm designed by Timothy Lottes at NVIDIA. It is also alluded to as fast sample anti-aliasing (FSAA).

The most significant benefit of this system of practice above standard spatial anti-aliasing is that it does not need huge amounts of computing power.

Reference: Anti-aliasing






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