Nyquist sampling

The Nyquist-Shannon sampling theorem defines a minimum sampling rate required to observe a signal feature as twice the spatial or temporal frequency of that feature. For example, to properly image a periodic grating with 1 µm spacing, each pixel must cover 0.5 µm or less (projected in the object plane). In practice, a minimum 2.3X sampling rate is recommended.

Synonyms: Nyquist-Shannon sampling , Nyquist criterion

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Spatial Resolution in Digital Imaging

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