olemus
(a) matemaatikas:
pideva funktsiooni teisendamine diskreetseks

https://www.cis.rit.edu/class/simg712-01/notes/13-Sampling.pdf

(b) signaalitöötluses:
pideva signaali muutmine diskreetseks

Wiktionary:
4. (signal processing) the measurement, at regular intervals, of the amplitude of a varying waveform in order to convert it to digital form

https://en.wikipedia.org/wiki/Sampling_(signal_processing)

https://sisu.ut.ee/sites/default/files/imageprocessing/files/digitizn.pdf