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What is aliasing?

Aliasing is an effect where different signals cannot be distinguished from each other while sampling. In digital images, aliasing occurs as a moiré pattern or rippling effect.

What are the effects of aliasing in videos?

In the sampling of videos, temporal aliasing is a major issue. Temporal aliasing is caused by the limited frame rate. It causes the wagon wheel effect, where the spokes of wheels appear to move slowly or backward.

What is moiré effect?

The moiré effect is an interference pattern when an opaque ruled pattern with transparent gaps is overlaid over another similar pattern.

How to avoid aliasing?

Aliasing can be avoided by increasing the sampling frequency above the Nyquist criterion. Limiting the bandwidth of the signal below one-half of the sample rate using a low-pass or anti-aliasing filter.