What is aliasing?
Aliasing is an effect which means that different signals can no longer be distinguished from one another during scanning. Aliasing is characterized by changing the output from the original signal because resampling or interpolation resulted in lower resolution in images, lower frame rate for video, or lower wave resolution in audio. Anti-aliasing filters can be used to correct this problem.

In a digital image, aliasing manifests itself as a moiré pattern or rippling effect. This spatial aliasing in the pattern of the image makes it appear as if it has waves or ripples emanating from a particular section. This happens because the pixelation of the image is poor; When our eyes interpolate these pixels, they just don't look right.

Aliasing can also occur in videos, where it is known as temporary aliasing, as it is caused by the frequency of the frames rather than the pixelation of the image. Because of the limited frame rate, a fast moving object like a wheel looks like it is turning backwards or too slowly. this is called the wagon wheel effect. This is determined by the frame rate of the camera and can be avoided by using temporary aliasing reduction filters while filming.

Im Audiobereich ist das Aliasing das Ergebnis einer Sampling-Sequenz mit niedrigerer Auflösung, was sich in schlechter Klangqualität und statischer Qualität äußert. Dies tritt auf, wenn Audio mit einer niedrigeren Auflösung als die Originalaufnahme gesampelt wird. Wenn die sinusförmige Audiowelle unter Verwendung einer Probe mit niedrigerer Auflösung in eine digitale Welle umgewandelt wird, werden nur einige spezifische Punkte der Welle als Daten genommen. Dies führt zu einer Welle mit einer niedrigeren Frequenz als das Original, was zu einem Verlust von Daten und Audioqualität führt.

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