Aliasing
![Properly sampled image of a brick wall](/Images/godic/202502/15/Moire_pattern_of_bricks5315.jpg")
![Spatial aliasing in the form of a moiré pattern](/Images/godic/202502/15/Moire_pattern_of_bricks_small5315.jpg")
![Two different sinusoids that fit the same set of samples.](/Images/godic/202502/15/AliasingSines.svg5315.png")
![The black dots are aliases of each other. The solid red line is an example of amplitude varying with frequency. The dashed red lines are the corresponding paths of the aliases.](/Images/godic/202502/15/Aliasing-folding5315.png")
In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. It also refers to the distortion or artifact that results when the signal reconstructed from samples is different from the original continuous signal.