aliasing definition by American Heritage Dictionary
- The appearance of jagged distortions in curves and diagonal lines in computer graphics because the resolution is limited or diminished.
- The static distortion in digital sound caused by a low sampling rate.
aliasing - Computer Definition
A phenomenon that occurs when different analog continuous signals overlap and become indistinguishable. If the sampling of the analog waveform is too infrequent (less than half the highest frequency present), the digitally encoded signal cannot reliably be decoded faithfully. Rather, it can be reconstructed as an alias of the true signal. Aliasing is a major concern in the digital encoding of analog audio and video signals. Aliasing in video signals results in artifacts in video images that can manifest as jagged blockings or a tiling effect. See also analog, digital, encoding, PCM, and waveform.
In computer graphics, the stair-stepped appearance of diagonal lines when there are not enough pixels in the image or on screen to represent them realistically. Also called "stair-stepping" and "jaggies." See anti-aliasing.
aliasing - Science Definition
- Jagged distortions in curves and diagonal lines in computer graphics caused by limited or diminished screen resolution. Compare antialiasing.
- Distortion in a reproduced sound wave caused by a low sampling rate during the recording of the sound signal as digital information.