Results 301 to 310 of about 278,785 (319)
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Partial correction for turbulent distortions in telescopes
Applied Optics, 1998To provide complete compensation for turbulent distortions in the visible range at aperture dimensions typical for modern telescopes (6-10 m), one needs to develop adaptive systems with hundreds of control channels. More simple adaptive systems that provide complete compensation in the infrared range can give an essential advantage in angular ...
V P, Lukin, B V, Fortes
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A Correction Method of Medical Thermography's Distortion
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005A problem of temperature distortion of medical thermography of the limb ending which results from different infrared radiant intensity of points detected by infrared detector was discussed. Further the difference of the radiant intensity is caused by that of projecting angles of points.
Zhenglong, Chen +4 more
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Correcting image distortion with fiber-optic tapers
Applied Optics, 1988We examine an ultraviolet camera used aboard a rotating spacecraft where the image motion due to spacecraft spin is canceled by synchronously stepping the image charge accumulating in a charge coupled detector. Critical to this procedure is the flattening of a velocity field associated with the spherical focal surface of the Burch configuration camera.
R A, King +3 more
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Multiperspective Distortion Correction Using Collineations
2007We present a new framework for correcting multiperspective distortions using collineations. A collineation describes the transformation between the images of a camera due to changes in sampling and image plane selection. We show that image distortions in many previous models of cameras can be effectively reduced via proper collineations.
Yuanyuan Ding, Jingyi Yu
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Unbending: Characterising Distortion and Correcting for IT
Proceedings, annual meeting, Electron Microscopy Society of America, 1990Unbending is becoming the fashionable alternative to simple correlation averaging, just as c-av earlier supplanted Fourier filtration or profile fitting. We note the circumstances in which it may be useful; and we recommend local real space image averaging in preference to Fourier methods.The displacement field in an image can be estimated reasonably ...
Saxton, W., Dürr, R.
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More on nonlinear distortion correction
IRE Transactions on Audio, 1961Further consideration is given to basic amplitude limitations which may apply to the complementary distortion method of nonlinear distortion correction. It is found, in disagreement with others, that points at which the differential gain is zero or infinite do not limit the amplitude over which complete correction is possible but that relative maxima ...
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The Correction of Lens Distortion with Polynomials
The Canadian Surveyor, 1976This paper presents results of an effort to express known lens distortion values by polynomials. Two polynomials, one expressing radial lens distortion, the other decentering distortion, were used with an increasing number of terms. The effectiveness of these two types of polynomials of various lengths was checked on photographs taken over a test ...
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Correcting distorted optics: back to the basics
Nature Methods, 2010A surprisingly simple method provides an effective way of correcting optical distortions in two-photon fluorescence microscopy and recovers nearly ideal images of inhomogeneous thick samples.
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