A layer of gravel, sand, or other material through which liquid is passed in order to remove impurities; also, a pond or tank containing such a layer.

plural of Gabor filter

(signal processing) A linear filter used for image texture analysis.

(signal processing) A filter that adds a delayed version of a signal to itself, causing constructive and destructive interference.

plural of comb filter

(signal processing) A bandstop filter with a narrow stopband.

plural of notch filter

plural of interference filter

plural of filter bed

A very thick filter paper or a pad composed of several filter papers