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%ما هو (من)٪ 1 - تعريف
Quadrature mirror filter
DIGITAL SIGNAL FILTER
Quadrature Mirror Filter
In digital signal processing, a quadrature mirror filter is a filter whose magnitude response is the mirror image around \pi/2 of that of another filter. Together these filters, first introduced by Croisier et al.
Photographic filter
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER
Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.
mirror site
REPLICA OF A WEBSITE WITH A DIFFERENT URL
Mirror site (2004); Web mirror; Mirror sites; Website mirror; Website mirroring; Mirror website; Mirror (website); Partial mirror
<networking> An archive site or website which keeps a
copy of some or all files at another site so as to make them
more quickly available and to reduce the load on the source
site.
It is generally best to use the mirror that is physically
closest to you as this will usually give the fastest download.
Such mirroring is usually done for specific whole directories
or files on a specific remote server as opposed to a cache
or proxy server which keeps copies of everything that is
requested via it.
For example, src.doc.ic.ac.uk is the main UK mirror for the
GNU archive at gnu.org.
(2006-10-16)
