oversampling

The digitization of a signal at a higher frequency than necessary to fully resolve it. According to the Nyquist sampling theorem the absolute minimum sampling rate is 2X. 2.3X is commonly recommended and 3 - 5X can be useful when the data is to be deconvolved. Sampling in excess of a recommended range is oversampling.

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Spatial Resolution in Digital Imaging

In terms of digital images, spatial resolution refers to the number of pixels utilized in construction of the image. Images having higher spatial resolution are composed with a greater number of pixels than those of lower spatial resolution.