Editing Aliasing (section)

== Angular aliasing ==
Aliasing occurs whenever the use of discrete elements to capture or produce a continuous signal causes frequency ambiguity.

Spatial aliasing, particular of angular frequency, can occur when reproducing a [[light field]] or sound field with discrete elements, as in [[3D display]]s or [[wave field synthesis]] of sound.<ref name=lightfield/>

This aliasing is visible in images such as posters with [[lenticular printing]]: if they have low angular resolution, then as one moves past them, say from left-to-right, the 2D image does not initially change (so it appears to move left), then as one moves to the next angular image, the image suddenly changes (so it jumps right) – and the frequency and amplitude of this side-to-side movement corresponds to the angular resolution of the image (and, for frequency, the speed of the viewer's lateral movement), which is the angular aliasing of the 4D light field.

The lack of [[parallax]] on viewer movement in 2D images and in [[3-D film]] produced by [[Stereoscopy|stereoscopic]] glasses (in 3D films the effect is called "[[yaw (rotation)|yaw]]ing", as the image appears to rotate on its axis) can similarly be seen as loss of angular resolution, all angular frequencies being aliased to 0 (constant).