Aliasing

In signal processing and related disciplines, aliasing refers to 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.

Aliasing can occur in signals sampled in time, for instance digital audio and is referred to as temporal aliasing. Aliasing can also occur in spatially sampled signals, for instance digital images. Aliasing in spatially sampled signals is called spatial aliasing.

Read more about AliasingDescription, Bandlimited Functions, Bandpass Signals, Sampling Sinusoidal Functions, Historical Usage, Angular Aliasing

Other articles related to "aliasing":

Aliasing - More Examples - Direction Finding
... A form of spatial aliasing can also occur in antenna arrays or microphone arrays used to estimate the direction of arrival of a wave signal, as in geophysical exploration by ...
Deferred Shading - Disadvantages
... disadvantage is that, due to separating the lighting stage from the geometric stage, hardware anti-aliasing does not produce correct results any more ... DLAA (used in Star Wars The Force Unleashed II), post MSAA (used in Crysis 2 as default anti-aliasing solution) ... Another popular technique is Temporal anti-aliasing, used in Halo Reach ...
Temporal Anti-aliasing
... Temporal anti-aliasing seeks to reduce or remove the effects of temporal aliasing ... Temporal aliasing is caused by the sampling rate (i.e ... To avoid aliasing artifacts altogether, the sampling rate of a scene must be at least twice as high as the fastest moving object ...
Sub-pixel Resolution - Aliasing
... While the end points of a straight line will fall on exactly within pixel, other points on the line will not be as clearly defined unless the line is perfectly horizontal or vertical ... These imperfections, known as aliasing, can be useful for gaining extra data from the image ...
Pointer Aliasing - Aliasing and Re-ordering
... Aliasing introduces strong constraints on program execution order ... in a program text, they need not occur in the same sequence in the machine code - aliasing read accesses are safe to re-order ... are assumed not to alias if they point to fundamentally different types ("strict aliasing" rules) ...