Refimprove date February 2008 Context date October 2009 In physics, endcorrection is the anomal difference between the frequency of a tuning fork and the corresponding sound wave s inside of a tube. It is caused because generally there is air space between the fork and the pipe end, causing the air column to vibrate a short distance beyond the edge of the tube. A theoretical basis for computation of the endcorrection is the radiation acoustic impedance of a circular piston . This impedance represents the ratio of Sound pressure acoustic pressure at the piston, divided by the Volumetric flow rate flow rate induced by it. The Airspeed air speed is typically assumed to be uniform across the tube end. This is a good approximation, but not exactly true in reality, since air viscosity reduces the flow rate in the boundary layer very close to the tube surface. Thus, air column inside the tube is loaded by the external fluid due to Acoustic radiation pressure sound energy radiation . This requires an additional length to be added to the regular length for calculating the Acoustic resonance Resonance of a tube of air natural frequency of the pipe system . Sources http www.fonema.se mouthcorr mouthcorr.htm Mouth Correction . Category Fluid dynamics phys stub th Endcorrection ... more details
Correction , via the identical French from the Latin corrig re to make straight again , is an action to rectify, to make right a wrong. It may have the following meanings To set straight an error, clarify a misunderstanding, undo resulting damage e.g. a correction newspaper in a newspaper is the posting of the notice of a mistake that appeared in a past issue of a newspaper To rectify an illogical state, e.g. a market anomaly as in correction stock market . As a euphemism for punishment , of various kinds, mainly physical in institutional terminology specifically used for imprisonment, e.g. correctional facility prison or corrections . the various duties of a corrector , a political administrative office in classical Antiquity and still an ecclesiastical one in the Catholic Church and one in the temple. Correction novel a novel 1975 by Austrian writer Thomas Bernhard disambig fr Correction pt Corretor desambigua o ... more details
reflist refimprove date February 2008 File Correction tape dispenser.png thumb Correction tape dispenser Correction tape is an alternative to correction fluid used to correct mistakes during typing, or, in some forms, handwriting. One side of the tape, which is placed against the error, is coated in a white, opaque masking material. Pressure applied to the other side of the tape transfers this material to the paper. History Empty section date January 2011 Types of correction tape It is sold as short pieces of tape, or as long rolls to be used in typewriter s, which apply sudden pressure when a key is struck, and can therefore apply the masking material in exactly the same shape and position as the erroneous character. Some versions of correction tape are sold in separate dispensers that are used to roll the tape onto paper directly, sometimes known as a correction mouse. The IBM Selectric typewriter also offered a correction tape that was actually a lift off tape for use with its carbon film typewriter ribbons . As it is solid, correction tape is not subject to misuse as an inhalant , unlike most correction fluids. See also Correction paper Correction fluid Liquid Paper DEFAULTSORT Correction Tape Category Correction instruments Category Stationery Category Typing Category Typewriters tool stub nl Blancoroller zh yue zh ... more details
Unreferenced date December 2009 Image Filmintypewriter.jpg thumb A sheet of correction paper in a typewriter. Correction paper , or correction film , its plastic based equivalent, is a tab of plastic with one side coated paper coated with white correction material. It is used to correct typing error s made when using a typewriter . When inserted between the paper and the typebar , and the ribbon select switched to stencil , i.e. inking turned off, the impression of the typebar presses the shape of the character into the film, which prints the white correction material onto the paper, hiding the erroneous Glyph character and preparing the document for the correct character. See also Correction fluid Correction tape DEFAULTSORT Correction Paper Category Correction instruments Category Stationery Category Typewriters Category Paper ... more details
infobox Book See Wikipedia WikiProject Novels or Wikipedia WikiProject Books name Correction title orig Korrektur translator Sophie Wilkins image image caption author Thomas Bernhard cover artist country Austria language German language German series genre Novel publisher Alfred A. Knopf release date 1979 media type Print Hardcover Hardback & Paperback pages 256 pp isbn ISBN 978 0099442547 Vintage Books USA , new edition 2003 oclc 51107174 preceded by The Lime Works Das Kalkwerk followed by Concrete Beton Correction is a novel by Thomas Bernhard , originally published in German language German in 1975, and first published in English language English translation in 1979 by Alfred A. Knopf . Correction s set is a garret in the middle of an Austria Austrian forest, described by the narrator as the thought dungeon in which the main character, Roithamer, will pursue his project of constructing an extraordinary habitation, the Cone , as a present for his beloved sister. Roithamer is deeply attached to his sister this does not, however, prevent his provoking her death, which occurs on the very day that she moves into this conic house that he has built for her with formidable effort, in the Kobernausser forest. Roithamer has unwittingly killed his sister by forcing her to inhabit a house that was completely contrary to her own nature. Plot summary The Austrian main character Roithamer, lecturer at Cambridge University Cambridge , after years of paroxystic projects, builds for his sister ... it to its extreme self correction suicide . Correction unravels between love and spite, humanity ... of his sister. It concludes with the rationalisation of suicide, ending with the sentence, The end is no process ... darker edge. Whilst the characters and situations in Correction are as comical and sometimes as absurd ... thomas bernhard correction Reconsidering Thomas Bernhard s Correction , by David Sepanik ... 2001 http www.webster.edu corbetre personal reading correction.html Bob Corbett s Comments on Correction ... more details
In statistics , Bessel s correction , named after Friedrich Bessel , is the use of n 1 instead ... of the population variance. The cost of this correction is that the unbiased estimator has uniformly ... data ref the factor n n 1 is itself called Bessel s correction . A subtle point is that, while the sample variance using Bessel s correction is an unbiased estimate of the population ..., though there are correction factors for particular distributions, such as the normal see unbiased estimation of standard deviation for details. One can understand Bessel s correction intuitively ... 2050 2 2050 2050 2 2051 2050 2 5 & frac 36 5 7.2. end align math But our estimate of the population ... align & quad frac 2051 2052 2 2053 2052 2 2055 2052 2 2050 2052 2 2051 2052 2 5 & frac 16 5 3.2. end ... mean, but end up calculating the sum of squared differences from the sample mean which is in effect ... from text the population text mean end smallmatrix , 2 & , overbrace , underbrace 2053 2052 begin smallmatrix text Deviation from text the sample mean end smallmatrix , text This is a. overbrace ... 2050 text This is 2ab. overbrace 2052 2050 2 text This is b 2. end align math Now apply this all five ... of the entries in this text middle column must be 0. end smallmatrix 2052 2050 2 end align math ... variance when the average of those squares is found. Terminology This correction is so common ... variance s sub n sub sup 2 sup is the biased sample variance i.e. without Bessel s correction s sup 2 sup is the unbiased sample variance i.e. with Bessel s correction The standard deviations ... n left frac n n 1 right ,s n 2 math Proof that Bessel s correction yields an unbiased estimator of the population ... x mu 2 right end align math Note that, since x sub 1 sub , x sub 2 sub , ... 2010 Notes Reflist External links MathWorld urlname BesselsCorrection title Bessel s Correction DEFAULTSORT Bessel s Correction Category Statistical deviation and dispersion Category Statistical ... more details
Perspective correction can mean Perspective control procedure for editing photographs A way of performing texture mapping during 3D rendering which does not have the distortions of pure affine transformations. disambiguation ... more details
The house of correction was a type of establshment built after the passing of the Elizabethan Poor Law 1601 , places where those who were unwilling to work , including vagrants and beggars, were set to work. The building of houses of correction came after the passing of an amendment to the Elizabethan Poor Law . ref http www.victorianweb.org history poorlaw elizpl.html The 1601 Elizabethan Poor Law Bot generated title ref However the houses of correction were not considered a part of the Elizabethan Poor Law system because the Act distinguished between settled poor and wandering poor. Notorious magistrate Allan Laing sent three youths to the house of correction for singing in the streets. In the Commonwealth of Massachusetts , the term remains synonymous with state jail s. http www.middlesexsheriff.org about newbhoc.htm References reflist Poor Law UK hist stub Category Poor Law Category Poverty no Spinnehus fi Kehruuhuone sv Spinnhus ... more details
Orphan date November 2009 Unreferenced date November 2009 Infinity Correction is a technique in microscopy whereby the light coming out of the objective lens is Focus optics focus ed at infinity . Category Microscopy optics stub ... more details
noreferences date April 2010 In optometry , prism correction is a component of some eyeglass prescription s. A corrective lens lens with prism correction displaces the image, which is used to treat muscular imbalance or other conditions see Vergence Vergence dysfunction vergence dysfunction that cause errors in eye orientation. Prism correction is measured in prism dioptres . A prescription that specifies prism correction will also specify the base , which is the direction of displacement. Prism dioptres Prism correction is commonly specified in prism dioptres , a unit of angular measurement that is loosely related to the dioptre . The prism dioptre of a lens is equal to one hundred times the Trigonometric functions tangent tangent of the angle by which it displaces an image seen through the lens. Prism dioptre is represented by the greek symbol delta . A prism of power 1 would produce 1 unit of displacement for an object held 100 units from the prism. Thus a prism of 1 would produce 1 cm visible displacement at 100 cm, 2 would produce 2 cm displacement at 100 cm, and so on. math P 100 tan d math where math P math is the amount of prism correction in prism dioptres, and math d math is the angle of deviation of the light. Prentice s rule Prentice s rule is a formula used when prescribing prism correction math P cf math where P is the amount of prism correction in prism dioptres c is decentration in centimetres f is lens power in dioptre s The practical use of Prentice s rule is that under certain circumstances, the prescribed prism can be obtained without grinding prism into the lenses, by decentering the lenses as worn by the patient. Category Ophthalmology Category Corrective lenses Category Optometry med stub optics stub fr Dioptrie prismatique ... more details
Image Spelling Correction Example.jpg thumb right 275px Correction fluid can be written on after it has dried. A correction fluid is an opaque, white fluid applied to paper to mask errors in text. Once dried, it can be written over. It is typically packaged in small bottles, and the lid has an attached brush or a triangular piece of foam which dips into the bottle. The brush is used to apply the fluid onto the paper. Before the invention of word processor s, correction fluid greatly facilitated the production of typewritten documents. One of the first forms of correction fluid was invented in 1951 by the secretary Bette Nesmith Graham , founder of Liquid Paper , and mother of Mike Nesmith of The Monkees . Thinner Because it contains organic solvent s volatile organic compounds , unused correction fluid thickens over time as volatile solvents escape into the air. It can become too thick to use, and sometimes completely solidifies. Therefore, some manufacturers sell also bottles of solvent as thinner , a few drops of which will return the correction fluid to its original liquid state. Thinner ... currently used with correction fluid include 1 Bromopropane bromopropane . Citation needed date February ... adolescent s ref http profiles.nlm.nih.gov VC B B D J Sniffing Correction Fluid Can Stop Your Heart ... drug use recreational drugs . Use of correction fluid as an inhalant can cause the heart to beat rapidly ... with inhaling or drinking the fluid. Correction pens More recently, correction fluid has become ... out since only a tiny surface is exposed during application or clogging. Notable brands Correction ... White Away Wite Out Tipp Ex Twink correction fluid Twink Pentel correction pen. Edigs Generally ... in Europe . Twink is the leading brand, and colloquial term, for correction fluid in New Zealand ... on colored paper. See also Correction paper Correction tape Liquid Paper References Notes reflist ... inventors blliquid paper.htm DEFAULTSORT Correction Fluid Category Correction instruments Category ... more details
Unreferenced date December 2009 Orphan date December 2009 The Langer correction is a correction when WKB approximation method is applied to three dimensional problems with spherical symmetry. When applying WKB approximation method to the radial Schr dinger equation math frac hbar 2 2 m frac d 2 R r dr 2 E V eff r R r 0 math where the effective potential is given by math V textrm eff r V r frac l l 1 hbar 2 2mr 2 math the eigenenergies and the wave function behaviour obtained are different from real solution. In 1937 , Rudolph E. Langer suggested a correction math l l 1 rightarrow left l frac 1 2 right 2 math which is known as Langer correction. This is equivalent to inserting a 1 4 constant factor whenever l l 1 appears. Heuristically, it is said that this factor arises because the range of the radial Schr dinger equation is restricted from 0 to infinity, as opposed to the entire real line. By such a changing of constant term in the effective potential, the results obtained by WKB approximation reproduces the exact spectrum for many potentials. References http prola.aps.org abstract PR v51 i8 p669 1 The original publication. DEFAULTSORT Langer Correction Category Theoretical physics ... more details
In statistics , the Bonferroni correction perhaps more accurately described as the Dunn Bonferroni correction ... by Olive Jean Dunn. The correction is based on the idea that if an experimenter is testing n ... level for the whole family of tests to be at most , then the Bonferroni correction would ... . The Dunn Bonferroni correction is derived by observing Boole s inequality . If you perform ... of Bonferroni correction see, e.g., Perneger, 1998 . First, Bonferroni correction controls the probability of Type I and type II errors Type I error false positives only. The correction ... to retain, not reject, the null hypothesis, then Bonferroni correction is non conservative. Alternatives to Bonferroni correction Holm Bonferroni method A uniformly more statistical power powerful test ... correction. A less restrictive criterion that does not control the familywise error rate is the False ... the p values, then using different criteria for each test. id k correction A related correction, called the id k correction or Dunn id k correction that is often used is math 1 1 alpha 1 n math This correction is often confused with the Bonferroni correction. The id k correction is derived ... valid confidence intervals matching the test decision using the id k correction by using 100 1 sup 1 n sup confidence intervals. The Bonferroni correction is a safeguard against multiple ... with n tests . The id k correction gives a stronger bound than the Bonferroni correction, because, for math n ge 1 math , math alpha n le 1 1 alpha 1 n math . But the id k correction requires the additional condition of independence. Previously, because the id k correction requires fractional powers i.e. roots , the computationally simpler Bonferroni correction was often preferred instead ... methods are highly similar for conventional significance levels between .01 and .10 . Dunnett s correction ... of p value correction methods under the context of differential gene expression analysis DEFAULTSORT ... more details
K correction is a correction to an Astronomy astronomical object s Magnitude astronomy magnitude or equivalently, its flux that allows a measurement of a quantity of light from an object at a redshift z to be converted to an equivalent measurement in the rest frame of the object. If one could measure all the light from an object at all wavelength s a bolometric flux , a K correction would not be required. If one measures the light emitted in an emission line , a K correction is not required. The need for a K correction arises because an astronomical measurement through a single filter optics filter or a single bandpass only sees a fraction of the total spectrum , redshifted into the frame of the observer. So if the observer wants to compare the measurements through a red filter of objects at different redshifts, the observer will have to apply estimates of the K corrections to these measurements to make a comparison. One claim for the origin of the term K correction is Edwin Hubble , who supposedly arbitrarily chose math K math to represent the reduction factor in magnitude due to this effect. ref cite journal title Effects of Red Shifts on the Distribution of Nebulae authorlink Edwin Hubble first Edwin last Hubble year 1936 journal Astrophysical Journal volume 84 pages 517 554 doi 10.1086 143782 ref Yet Kinney et al., in footnote 7 on page 48 of their article ref cite journal title Template ultraviolet spectra to near infrared spectra of star forming galaxies and their application ... volume 206 issue 13 pages 109 ref , who referred to the correction as a Konstante German for constant , hence K correction. The exact nature of the calculation that needs to be applied in order to perform a K correction depends upon the type of filter used to make the observation and the shape of the object ... www.ucolick.org cnaw kcorr kplot.html K Correction plots http xxx.lanl.gov abs astro ph 0210394 The K correction DEFAULTSORT K Correction Category Astrophysics Category Doppler effects astronomy stub ... more details
function gamma correction is sometimes applied to the video signal so that the end to end response ...Image Gamma06 600.png thumb Example of Cathode ray tube CRT gamma correction Image GammaCorrection demo.jpg thumb The effect of gamma correction on an image The original image was taken to varying powers ... dark regions lighter. Gamma correction , gamma nonlinearity , gamma encoding , or often simply gamma ... &as brr 3&ei WHfDR6q4J4OmswOGiZXPDw&sig OYiWf7BJ2ACTek1UAsbcXOIlvP0 ref Gamma correction is, in the simplest ... in choosing in which reduced form the original image should be presented. The gamma correction ... gamma correction, since the standard video signals that are transmitted or stored in image files ... 0.0 and 0.1, while the steps at the higher end of the scale are hardly perceptible. The linearly encoded ... and cannot be described with gamma value. However, such displays apply a correction onto the signal ... of 2.2, without a linear portion. Methods to perform display gamma correction in computing Up to four ... system s gamma, further correction may be done, either on display or to create a modified image file ... once with the appropriate gamma correction look up table in order to modify the encoded signals digitally ... the output device will do gamma decoding or correction as needed, to get to a linear intensity domain. All the encoding and correction methods can be arbitrarily superimposed, without mutual knowledge ..., the role of gamma correction will involve several cooperating parts. The camera encodes its rendered ... memory. The monitor may do its own gamma correction to match the CRT gamma to that used by the video ... can change gamma correction settings, by issuing the command code xgamma gamma 2.1 code for setting ... properly applies to a subjective visual attribute. Gamma correction is a type of power law function ... correction, one may avoid confusion by saying generalized power law function. Without context ... http www.cgsd.com papers gamma.html CGSD Gamma Correction Home Page by Computer Graphics Systems ... more details
Infobox Album See Wikipedia WikiProject Albums Name Position Correction Type Album Artist TZU Cover Positioncorrection.jpg Released 2004 Recorded Genre Australian hip hop Length 51 15 Label Liberation Music P & C Liberation Music Producer TZU Last album This album Position Correction br 2004 Next album Smiling at Strangers br 2005 Position Correction is the debut album by Australian Hip Hop band TZU , released in 2004. The album was released under the Liberation Music P & C Liberation Music record label. Track listing Who? 3 56 Summer Days 3 53 Position Correction 3 57 Good Dog 4 23 Dam Busters 2 32 Wild Stylee feat. Mark Pearl 4 15 Curse of the Word 4 21 The Horse You Rode In On 3 35 Back Up 3 57 Bold Digger 5 55 The Travel Song 10 32 Singles Dam Busters Category TZU albums Category Debut albums Category 2004 albums 2000s hiphop album stub Australia stub ... more details
through a probe sealed to a core slab by a gasket . The gas flows from the end of a small diameter ... External links DEFAULTSORT Klinkenberg Correction Category Petroleum engineering Category Petrology ... more details
merge Color gel discuss Talk Color gel Merger proposal date October 2010 About color correction using lighting and camera filters video color correction in post production Color grading color correction of still images in post production Color balance mutual color correction of digital images Color mapping Color correction by using color gel s, or filters, is a process used in stage lighting , photography , television , cinematography and other disciplines, the intention of which is to alter the overall color of the light typically the light color is measured on a scale known as color temperature , as well as along a green magenta axis orthogonal to the color temperature axis. Without color correction gels, a scene may have a mix of various colors. Applying color correction gels in front of light sources can alter the color of the various light sources to match. Mixed lighting can produce an undesirable aesthetic when displayed on a television or in a theatre. Conversely, gels may also be used to make a scene appear more natural by simulating the mix of color temperatures that occur naturally. This application is useful especially where motivated lighting lending the impression that it is diegetic is the goal. Color gels may also be used to tint lights for artistic effect. Correlated color temperature image PlanckianLocus.png thumb Chromaticity diagram, Planckian locus, and lines ... this dimension is sometimes referred to as tint or CC . Gel nomenclature The main color correction ... and correction gels 22 intitle lighting inauthor jackman temperatures&lr &as brr 0&ei WZ95SIqFAYP8swOjqJTPCQ ... balance can be achieved by digital or electronic manipulation of the signal and hence color correction ... without any digital filtering applied. Using physical color correction filters to white balance instead ... news gathering ENG use filter wheels containing color correction filters and are designed ... manipulation of white balance is possible in the original camera negative. Color correction filters ... more details
In particle physics , a nonoblique correction , also called a direct correction , refers to a particular type of Renormalization radiative correction to the electroweak sector of the Standard Model. Nonoblique corrections are defined in four fermion scattering processes SubatomicParticle Antielectron SubatomicParticle Electron SubatomicParticle quark SubatomicParticle Antiquark at the CERN LEP collider. There are three classes of radiative corrections to these processes vacuum polarization corrections, vertex function vertex corrections , and box corrections. The vertex and box corrections, which depend on the identity of the initial and final state fermions, are referred to as the non oblique corrections. The vacuum polarization corrections are referred to as oblique correction s, since they only affect the mixing and propagation of the gauge bosons and they do not depend on which type of fermions appear in the initial or final states. An example of a vertex correction is the nonuniversality flavor dependence of the couplings of the quarks and leptons to the charged and neutral weak currents. Another example is the anomalous magnetic dipole moment . In order to affect the nonoblique corrections, new particles must couple directly to the external fermions. Such couplings are expected to be suppressed in most cases, with one exception being the math Z b bar b math vertex. Together with the oblique corrections, nonoblique corrections can be used to constrain models of new physics beyond the Standard Model . References J.L. Hewett, The Standard Model and Why We Believe It , http arxiv.org abs hep ph 9810316 arXiv hep ph 9810316 , lectures given at Theoretical Advanced Study Institute TASI 97 . Category Particle physics particle stub ... more details
In astronomy , a bolometric correction is a correction that must be made to the absolute Magnitude astronomy magnitude of an object in order to convert an object s visible magnitude to its Bolometric magnitude Bolometric magnitude bolometric magnitude . Mathematically, such a calculation can be expressed math BC M b M v , math The following is subset of a table from Kaler ref cite journal title Stars and their spectra An Introduction to the Spectral Sequence author Kaler, James B. year 1989 pages 300 ref p. 263 listing the bolometric correction for a range of stars. For the full table, see the referenced work. class wikitable border 1 Class Main Sequence Giants Supergiants O3 4.3 4.2 4.0 G0 0.10 0.13 0.1 G5 0.14 0.34 0.20 K0 0.24 0.42 0.38 K5 0.66 1.19 1.00 M0 1.21 1.28 1.3 The bolometric correction is large both for early type hot stars and for late type cool stars. The former because a substantial part of the produced radiation is in the ultraviolet, the latter because a large part is in the infrared. For a star like our Sun, the correction is only marginal because the Sun radiates most of its energy in the visual wavelength range. See also absolute magnitude External links http www.peripatus.gen.nz Astronomy SteMag.html contains table of bolometric corrections References references Category Observational astronomy astronomy stub nl Bolometrische correctie ... more details
The Davidson correction is a simple correction that is often applied in calculations using the method of configuration interaction , which is one of several post Hartree&ndash Fock ab initio quantum chemistry methods in the field of computational chemistry . It was introduced by Ernest R. Davidson . It allows one to estimate the value of the full configuration interaction energy from a limited configuration interaction expansion result, although more precisely it estimates the energy of configuration interaction up to quadruple excitations CISDTQ from the energy of configuration interaction up to double excitations CISD . It uses the formula math Delta E Q 1 a 0 2 E rm CISD E rm HF , math math E rm CISDTQ approx E rm CISD Delta E Q, math where a sub 0 sub is the coefficient of the Hartree&ndash Fock wavefunction in the CISD expansion, E sub CISD sub and E sub HF sub are the energies of the CISD and Hartree&ndash Fock wavefunctions respectively, and E sub Q sub is the correction to estimate E sub CISDTQ sub , the energy of the CISDTQ wavefunction. References Langhoff, S. R. and Davidson, E. R., International Journal of Quantum Chemistry , 8 , 61, 1974 Category Computational chemistry chem stub quantum stub ... more details
In particle physics , an oblique correction refers to a particular type of Renormalization radiative correction to the electroweak sector of the Standard Model. Oblique corrections are defined in four fermion scattering processes, SubatomicParticle Antielectron SubatomicParticle Electron SubatomicParticle quark SubatomicParticle Antiquark at the CERN LEP collider. There are three classes of radiative corrections to these processes vacuum polarization corrections, vertex function vertex corrections , and box corrections. The vacuum polarization corrections are referred to as oblique corrections, since they only affect the mixing and propagation of the gauge bosons and they do not depend on which type of fermions appear in the initial or final states. The vertex and box corrections, which depend on the identity of the initial and final state fermions, are called nonoblique correction s. Any new particles charged under the electroweak gauge group s can contribute to oblique corrections. Therefore, the oblique corrections can be used to constrain possible new physics beyond the Standard Model . To affect the nonoblique corrections, on the other hand, the new particles must couple directly to the external fermions. The oblique corrections are usually parameterized in terms of the Peskin Takeuchi parameter s S, T, and U. References J.L. Hewett, The Standard Model and Why We Believe It , http arxiv.org abs hep ph 9810316 arXiv hep ph 9810316 , lectures given at Theoretical Advanced Study Institute TASI 97 . Category Particle physics particle stub ... more details
refimprove date August 2008 orphan date August 2008 Atmospheric correction is the process of removing the effects of the atmosphere on the reflectance values of images taken by satellite or airborne sensors. ref cite web url http www.umiacs.umd.edu research GC atmo index.html title Atmospheric Correction accessdate 2008 08 18 publisher University of Maryland Institute for Advanced Computer Studies ref There are bidirectional and empirical models for doing atmospheric correction on an image. See also colbegin 3 Adaptive optics colend References reflist External links http books.google.ca books?id u17Zv45DENoC&pg PA157&lpg PA157&dq Atmospheric Corrections&source web&ots ABVKHMTh f&sig f gR5KqcbXqCeK0PXk6dY5UuC9s&hl en&sa X&oi book result&resnum 2&ct result Google books result http books.google.ca books?id KQXNaDH0X IC&pg PA343&lpg PA343&dq Atmospheric Corrections&source web&ots skh0EQFcMH&sig sRzu7plKBpDjDrLkrDHTuGXdkcc&hl en&sa X&oi book result&resnum 5&ct result Google books result Category Photographic techniques science stub ... more details
Pitch correction is the process of correcting the Intonation music intonation of an Audio signal processing audio signal without affecting other aspects of its sound. Pitch correction first detects the pitch of an audio signal using a live pitch detection algorithm , then calculates the desired change and modifies the audio signal accordingly. The widest use of pitch correctors is in Western popular music on vocal lines. History Pitch correction was relatively uncommon before 1997, when Antares Audio Technology s Auto Tune Pitch Correcting Plug In was introduced. This replaced slow studio techniques with a real time process that could also be used in live performance. ref Anderton, Craig. In Search of the Perfect Pitch The fix is in . EQ. 2006 07 01. Pg. 46. ref Auto Tune is still widely used, alongside other products such as Celemony s Melodyne . Pitch correction is now a common feature in digital audio editing software, having first appeared as a Pro Tools plugin and now being found in products such as Apple GarageBand , Apple Logic Pro , Adobe Audition , FL Studio & Steinberg Cubase . It is also available in the form of rackmount hardware , such as the TC Helicon VoiceOne. A free VST plugin known as GSnap can also be used to get the same effect. Uses of pitch correction Besides correcting out of tune vocals, pitch correction has numerous other applications and is commonly used to add a harmony to certain words or phrases without re recording those words or phrases again and again ... correction has also become popular as a distinctively electronic voice effect. A notable example of Auto Tune based pitch correction is the Cher effect , named for Cher , who originated the effect ... of pitch correction is that it allows recording engineers to create a perfectly in tune performance ... Moorer attached stickers to her album Miss Fortune reading Absolutely no vocal tuning or pitch correction ... of how prevalent pitch correction is in the industry quote I m not a perfect note hitter either ... more details
Unreferenced date April 2007 Dioptric correction is the expression for the adjustment of the optical instrument to the varying visual acuity of a person s Human eyes eyes . It is the adjustment of one lens optics lens to provide compatible focus optics focus when the viewer s eyes have differing visual capabilities. One result is less strain on the eyes that allow for optimal viewing and depth perception depth and contrast vision contrast focusing when composing a photograph or viewing an item through a device made of lenses or lens elements. References reflist optics stub Category Optics ... more details
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