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Creación de frecuencias no deseadas
| Глоссарий по архивному хранению медийных материалов |
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Aliasing, английский
- Also known as moir? patterning. this is an effect that occurs when an analogue signal is sampled digitally at a sampling frequency less than twice the signal frequency. the effect can be minimised by a technique known as optical low-pass filtering.
- Алиасинг. эффект, воспринимающийся как высокочастотный шум из-за недостаточной частоты дискретизации при аналогово-цифровом преобразовании. уменьшить этот эффект можно с помощью фильтрации сигнала.
- Interference phenomenon which occurs when a sampled signal contains frequencies that are higher than half the sampling frequency. a ccd samples the picture spatially. an optical low-pass filter is used to avoid aliasing, especially in color applications.
- An effect caused by sampling an image (or signal) at too low a rate. it makes rapid change (high texture) areas of an image appear as a slow change in the sample image. once aliasing occurs, there is no way to accurately reproduce the original image from the sampled image.
- The process by which smooth curves and lines that run diagonally across the screen of a low-resolution digital file take on a jagged look as opposed to a smooth, natural rendition. aliasing is an artifact that results from a sample resolution that is not more than twice the frequency of what is being captured, or the nyquist rate. a common form of aliasing is moire. smoothing and anti-aliasing techniques can reduce the effects of aliasing.
- This is an effect caused by sampling an image at to low a rate. it causes rapid change (high texture) areas of an image to appear as a slow change in the sample image. once this has happened, it is extremely difficult to reproduce the original image from the sample.
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Aliasing (2), английский
Altoritmo, испанский
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