drummyfish/less_retarded_wiki
5
1
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Update

Browse source
This commit is contained in:
Miloslav Ciz 2024-05-02 22:35:34 +02:00
parent fab11be42b
commit 1cfa0787d3
16 changed files with 1922 additions and 1760 deletions
Download patch file Download diff file Expand all files Collapse all files

2
aliasing.md
View file

@ -1,5 +1,7 @@
# Aliasing
*See also [antialiasing](antialiasing.md).*
Aliasing is a certain typically undesirable phenomenon that distorts [signals](signal.md) (such as sounds or images) when they are [sampled](sampling.md) [discretely](discrete.md) (captured at single points, usually at periodic intervals) -- this can happen e.g. when capturing sound with digital recorders or when [rendering](rendering.md) computer graphics. There exist [antialiasing](antialiasing.md) methods for suppressing or even eliminating aliasing. Aliasing can be often seen on small checkerboard patterns as a moiré pattern (spatial aliasing), or maybe more famously on rotating wheels or helicopter rotor blades that in a video look like standing still or rotating the other way (temporal aliasing, caused by capturing images at intervals given by the camera's [FPS](fps.md)).
A simple example showing how sampling at discrete points can quite dramatically alter the recorded result: