underfilter

To filter insufficiently.

Noun

  1. A morphological filter (idempotent operator) whose image is a subset of the domain.
    • It is clear that overfilters and underfilters are dual in the sense of the duality principle. - 1999, Edward R. Dougherty, Jaakko Astola, Nonlinear Filters for Image Processing, page 180:
  2. A filter that is positioned beneath something.
    • The paving downstream consisted of 18x18x8-inch blocks laid on edge over a brick base which in turn was underlain with a gravel or brick chip filter. Since there was some controversy as to whether an underfilter was...
    • Since there is no underfilter, the top flow line emerges on the downstream slope. - 1988, Árpád Kézdi, László Rétháti, Handbook of Soil Mechanics, page 61:
    • A single sheet of filter paper is used as an underfilter. - 1992, Margaret M. Manson, Immunochemical Protocols, page 445:

Origin

From under- + filter.

Forms

underfilters

Verb

  1. To filter insufficiently.
    • It is not possible to overfilter your tank but marine aquaria are frequently underfiltered. - 1966, William P. Braker, Know how to Keep Saltwater Fishes, page 19:
    • You don't want to underfilter. Nor do you want to filter beyond what is economically justifiable. - 1978, Hydraulics and Pneumatics:
    • Underfiltering by using too high a cut-off frequency leaves too much noise in the reconstructed images (bottom row). - 1994, Douglas Van Nostrand, Selected Atlases of Cardiovascular Nuclear Medicine, →ISBN, page 35:

Forms

underfilters underfiltering underfiltered