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What is meant by aliasing?

Updated: 11/12/2022
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Distortion of frequency introduced by inadequately sampling a signal, which results in ambiguity between signal and noise. An unaliased image is an undistorted image provided by a robust sampling.

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In signal processing, computer graphics and related disciplines, aliasing refers to an effect that causes different continuous signals to become indistinguishable (or aliases of one another) when sampled. It also refers to the distortion or artifact that results when a signal is sampled and reconstructed as an alias of the original signal.

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