smoothing jagged edges on graphic images by using intermediate shades (Computers)
In
digital signal processing, anti-aliasing is the technique of minimizing the distortion artifacts known as
aliasing when representing a high-resolution signal at a lower resolution. Anti-aliasing is used in
digital photography,
computer graphics,
digital audio, and many other domains.In the image domain, aliasing artifacts can appear as wavy lines or bands, or
moiré patterns, or popping,
strobing, or as unwanted sparkling; in the sound domain, as rough, inharmonic, or spurious tones, or as noise.Anti-aliasing means removing signal components that have a higher
frequency than is able to be properly resolved by the recording (or sampling) device. This removal is done before (re-)sampling at a lower resolution. When sampling is performed without removing this part of the signal, it causes undesirable artifacts such as the black-and-white noise near the top of figure 1-a.
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