16th October 2019

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What is aliasing and moire effect?

Aliasing shows up in images in different ways. One common effect is a rainbow of colours across a fine repeating pattern, this is called moiré. Another artefact could be lines and edges that are just a little off horizontal or vertical appearing to have stepped or jagged edges, sometimes referred to as “jaggies”.

Furthermore, what is anti aliasing in photography?

Anti-aliasing filters are used to blur the lines between repeating patterns in order to avoid wavy lines (often referred to as moire). But before we can fully understand what the anti-aliasing filter does for our cameras, we need to first have a basic understanding of what aliasing is in general.

What is aliasing in CG?

(1) In computer graphics, the process by which smooth curves and other lines become jagged because the resolution of the graphics device or file is not high enough to represent a smooth curve. Smoothing and antialiasing techniques can reduce the effect of aliasing.

Why do we use anti aliasing filter?

This filter is an anti-alias filter because by attenuating the higher frequencies (greater than the Nyquist frequency), it prevents the aliasing components from being sampled. Because at this stage (before the sampler and the ADC) you are still in the analog world, the anti-aliasing filter is an analog filter.
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