contrast transfer function
61Grating — A grating is any regularly spaced collection of essentially identical, parallel, elongated elements. Gratings usually consist of a single set of elongated elements, but can consist of two sets, in which case the second set is usually… …
62Comparator — For other uses, see Comparator (disambiguation). In electronics, a comparator is a device that compares two voltages or currents and switches its output to indicate which is larger. They are commonly used in devices such as Analog to digital… …
63Spatial cutoff frequency — In optics, spatial cutoff frequency is a precise way to quantify the smallest object resolvable by an optical system. Due to diffraction at the image plane, all optical systems act as low pass filters with a finite ability to resolve detail. If… …
64International Committee for Display Metrology — ICDM International Committee for Display Metrologya committee of the [http://www.sid.org/ SID] (Society for Information Display)The ICDM (International Committee for Display Metrology) has been and still is producing a comprehensive Display… …
65Zapruder film — The Zapruder film is a silent 8 mm color home movie of the presidential motorcade of John F. Kennedy through Dealey Plaza in Dallas, Texas, on November 22, 1963, filmed by a private citizen named Abraham Zapruder. The film is the most complete… …
66Audio crossover — A passive 2 way crossover designed to operate at loudspeaker voltages Audio crossovers are a class of electronic filter used in audio applications. Most individual loudspeaker drivers are incapable of covering the entire audio spectrum from low… …
67Analog sound vs. digital sound — Analog sound versus digital sound compares the two ways in which sound is recorded and stored. Actual sound waves consist of continuous variations in air pressure. Representations of these signals can be recorded in either digital or analog… …
68Catadioptric system — A 150 mm aperture catadioptric telescope (Maksutov) A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric… …
69Leeds test object — A Leeds Test Object or Leeds Phantom is a quality assurance tool for a medical imaging device. These devices are mostly concerned with x ray imaging techniques such as fluoroscopy, digital radiography, mammography and computed tomography (CT)… …
70cell — cell1 cell like, adj. /sel/, n. 1. a small room, as in a convent or prison. 2. any of various small compartments or bounded areas forming part of a whole. 3. a small group acting as a unit within a larger organization: a local cell of the… …
