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1. Hongquan Xu (2003). Minimum moment aberration for nonregular designs and supersaturated designs. Vol.13, No.3.
- www.stat.sinica.edu.tw
- MINIMUM MOMENT ABERRATION FOR NONREGULAR .
- Abstract: A novel combinatorial criterion, called minimum moment aberration, is proposed for assessing the goodness of nonregular designs and supersaturated designs. The new criterion, which is to sequentially minimize the power moments of the number of coincidences among runs, is a surrogate with tremendous computational advantages for many statistically justified criteria, such as minimum -aberration, generalized minimum aberration and. In addition, the minimum moment aberration is conceptually simple and convenient for theoretical development. ...
- Key words and phrases: Complementary design, fractional factorial design, generalized minimum aberration, orthogonal array, Pless power moment identity. ...
2. Melles Griot Optics Guide - Spherical Aberration
- www.mellesgriot.com
- Fundamental Optics Performance Factors Aberrations Spherical Aberration .
- Spherical Aberration.
- Spherical aberration, shown below in a computer-generated mesh, is a deviation of the laser wavefront from an ideal spherical shape. If the wavefront of a laser has spherical aberration, then a focused spot made from the wavefront will be bright spot surrounded by a faint halo. In imaging systems, spherical aberration tends to blur the image and reduce the contrast. ...
- Wavefront showing spherical aberration.
- The figure below illustrates how an aberration-free lens focuses incoming collimated light.
- Focusing with aberration-free lens.
- Focusing with a lens exhibiting spherical aberration.
- The distance along the optical axis between the intercept of the rays that are nearly on the optical axis (paraxial rays) and the rays that go through the edge of the lens (marginal rays) is called longitudi- nal spherical aberration (LSA). The height at which these rays intercept the paraxial focal plane is called transverse spherical aberration (TSA). ...
- Spherical aberration is dependent on lens shape, orientation, and conjugate ratio, as well as on the index of refraction of the materials present. ... However, the third-order, monochromatic, spherical aberration of a plano-convex lens used at infinite conjugate ratio can be estimated by .
- Theoretically, the simplest way to eliminate or reduce spherical aberration is to make the lens surface(s) with a varying radius of curvature (i. ... The manufacture of aspheric surfaces is more complex, and it is difficult to produce a lens of sufficient surface accuracy to eliminate spherical aberration completely. ...
- In general, simple positive lenses have undercorrected spherical aberration, and negative lenses usually have overcorrected spherical aberration. ... The simplest examples of this are cemented doublets, such as the 01 LAO series, which produce minimal spherical aberration when properly used.
3. Phenomena Cross Reference - ABERRATION - ASTIGMATISM
- www.exploratorium.edu
- ABERRATION - ASTIGMATISM.
- Aberration - Barrel.
- Aberration - Chromatic.
- Aberration - Coma.
- Aberration - Curvature of Field.
- Aberration - Pincushion.
- Aberration - Spherical.
4. C-ship: The Aberration of Light
- www.fourmilab.ch
- C-ship: The Aberration of Light .
- Unlike the Lorentz contraction or the dilation of time, which are purely relativistic effects with no counterparts in classical (Newtonian) physics, the aberration of light is predicted by classical physics and was first demonstrated in 1725, two years before Newton's death. Special relativity modifies the classical formula for aberration, predicting results which differ substantially from those of classical physics only for objects moving at a substantial fraction of the speed of light. Classical Aberration.
- To understand relativistic aberration, we'll start by exploring classical aberration to better understand the changes required by special relativity. Before we set out in our C-ship to explore the aberration of light, let's warm up by taking a journey in a much more familiar environment, a European train crossing the countryside during a typical European drizzle. The Aberration of Rain.
- Classical Aberration of Light.
- In classical physics, the aberration of light is precisely like the aberration of rain we've just experienced; the only difference is that light travels considerably faster than rain, about 18 million times faster, as a matter of fact. The aberration observed depends only on the speed of the object and the speed you're travelling with respect to it. ...
- But that doesn't mean aberration of light can't be seen from the Earth. ...
- In 1725 James Bradley, an English amateur astronomer, was attempting to observe stellar parallax when, through meticulous observation he observed that stars did trace out small ellipses in the sky as expected for parallax, but that all stars traced out precisely the same ellipses! This didn't make any sense at all; the only way the parallax of all stars could be same would be if all the stars were the same distance from the Earth--a regression to the Earth-centred universe with a vengeance! After a while, the apparent motion Bradley observed was discovered to be the result of the aberration of light. ...
- However, by Bradley's time the art and science of measuring the positions of stars had advanced to such an extent that he was able to observe the mere 41 arc-second displacement of the apparent position of stars due to aberration. ...
- The classical aberration of light discovered by Bradley must be taken into account whenever accurate positions of objects in the sky are calculated. Relativistic Aberration.
- In classical physics, the aberration of light works just like the aberration of rain--it depends on the ratio of the speed you're going to the speed of light. It's only because the speed of light is so great that it takes precise measurement of the position of stars to make aberration apparent. Classical physics, then, predicts that if we were to travel at the speed of light we'd measure the aberration of light from a source orthogonal to our direction of travel to be 45°. ...
5. Chromatic Aberration
- hyperphysics.phy-astr.gsu.edu
- Chromatic Aberration.
- The amount of chromatic aberration depends on the dispersion of the glass. ...
- One way to minimize this aberration is to use glasses of different dispersion in a doublet or other combination. ...
- Doublet for Chromatic Aberration.
- The use of a strong positive lens made from a low dispersion glass like crown glass coupled with a weaker high dispersion glass like flint glass can correct the chromatic aberration for two colors, e. ...
- An achromat doublet does not completely eliminate chromatic aberration, but can eliminate it for two colors, say red and blue. ...
- Another approach to chromatic aberration reduction is to use two positive lenses separated by one half the sum of their wavelengths. ...
- Chromatic aberration for three colors can be eliminated with and apochromat triplet. ...
- Better correction of chromatic aberration has been achieved than that afforded by the achromat doublets. ...
6. PhotoNotes.org Dictionary - Chromatic aberration
- photonotes.org
- Chromatic aberration.
- Typically, special glass with a low refractive index (ED glass for Nikon and UD glass and fluorite for Canon) is used to correct for chromatic aberration, particularly on telephoto and retrofocus wide-angle lenses, both of which have very assymetrical lens designs.
- Technically there are two forms of chromatic aberration - longitudinal (or axial) and lateral (or transverse (TCA) or chromatic difference of magnification). ... Lateral chromatic aberration is very common on inexpensive lenses and cannot be reduced by reducing the lens aperture.
- aberration, achromatic, apochromatic, dispersion, ED, fluorite, prism, refractive index, retrofocus, spectrum, telephoto lens, UD.
7. rft's photography / Tips & Tricks / Correcting Chromatic Aberration of Digital Cameras
- ray.cg.tuwien.ac.at
- Correcting Chromatic Aberration of Digital Cameras.
- A Photoshop/Panorama Tools action that fixes the most visible effects of chromatic aberration in photos taken with some digital Cameras. ...
- But there are actually two different phenomena that commonly run under that name: chromatic aberration and another phenomenon that is often called (for lack of a better name) blooming. Chromatic aberration is a deficiency of the lens that results in colour fringes that are only present on the peripheral parts of a photo. Another clear indication of chromatic aberration is, that the coloured fringes only appear on non-radial edges and their colour depends on the orientation with respect to the center. Here is a blown up example of chromatic aberration that was taken from a part of the image that was close to the left upper corner (note the reddish and greenish fringes of the bright regions):.
- chromatic aberration .
- On this page we limit our efforts to develop a method that ameliorates the effects of chromatic aberration only.
- Correction of Chromatic Aberration using Panorama Tools.
- Just scaling the red channel reduces chromatic aberration for high contrast edges, but introduces colour fringes in low contrast areas. ...
- Although this is the final result of our correction of chromatic aberration, there is one more thing to note: sharpening such an image in RGB mode will introduce unwanted colour artefacts. ...
- If you follow these instructions you can correct some of the effects caused by chromatic aberration, as demonstrated in this comparison of blown up portions of the same image before and after the correction:.
- Scroll the image, so that you see the edges that are most affected by chromatic aberration. ...
- Selecting the edges which are affected by chromatic aberration.
- Based on the amount of chromatic aberration values between 0. ...
- Now press OK in the Correct Options panel to peform the actual correction of chromatic aberration. ...
8. Eliminating color fringing (lateral chromatic aberration)
- www.normankoren.com
- Eliminating color fringing (lateral chromatic aberration) .
- Color fringing is caused by lateral chromatic aberration, one of the two types of chromatic aberration in lenses, both of which arise from dispersion in glass: the variation in its ability to bend light (its index of refraction) with wavelength (color). Longitudinal chromatic aberration is the change of the lens's point of focus for different wavelengths. Lateral chromatic aberration is the change in a lens's magnification for different wavelengths, resulting in color fringing. ... The two types of chromatic aberration are described in Quality Criteria of Lenses by Schneider Optics. ... His terminology is a little different: he uses transverse chromatic aberration (TCA) instead of lateral. ... 1's Chromatic Aberration. ... The input image is on the left; the preview on the right; the Chromatic Aberration correction control box is below. ...
- After you remove the chromatic aberration there will be colored bands at the margins of the image. ...
- You should correct chromatic aberration before sharpening. I don't know the fine details of sharpening algorithm, but it is likely performed in HSV or HSL color space on the V (Value) or L (Lightness) boundaries, which will be much more distinct after removing chromatic aberration. ... 8 is "an excellent lens," as defined in Understanding image sharpness and MTF curves, especially after chromatic aberration is removed. ...
9. Aberration with Synergy Trading System
- www.traderstech.net
- Aberration.
- Aberration & Checkmate.
- Aberration & Synergy.
- Aberration & Synergy & Checkmate.
- Aberration & Checkmate.
- Aberration & Synergy & Checkmate.
- ABERRATION 1%* risk per trade plus SYNERGY 1%* risk per trade COMBINED STATS.
- ABERRATION & SYNERGY COMBINED COMPOUNDED GROWTH EQUITY CURVE.
10. Aberrations
- cvu.strath.ac.uk
- Monochromatic Aberrations are effects that deform(field curvature and distortion) or degrade(spherical aberration, coma and astigmatism) the imaging ability of lenses. ...
- Spherical aberration is the name given to the effect where the focal length of a lens will vary depending on how far you are from the centre of the lens. ...
- Coma is similar to spherical aberration. ...
- Aberration Applet .
- This applet allows you to chose to see either an example of spherical aberration, coma or field curvature. The examples are not perfect as the system models real life so while you are looking at one aberration the others are also present. ...
11. Chromatic aberration
- farside.ph.utexas.edu
- Chromatic aberration .
- We have seen that both mirrors and lenses suffer from spherical aberration, an effect which limits the clarity and sharpness of the images formed by such devices. ...
- , combinations of simple lenses) to simultaneously eliminate both chromatic and spherical aberration. ...
12. Search Encyclopedia.com
- www.encyclopedia.com
- Home > Search Results > "spherical aberration" .
- spherical aberration spherical aberration: see aberration, in optics.
- aberration aberration, in optics, condition that causes a blurring and loss of clearness in the images produced by lenses or mirrors. Of the many types of aberration, the two most significant to the lens maker are spherical and chromatic. Spherical aberration is caused by the failure of a lens or mirror of spherical section to b.
- Look up "spherical aberration" on HighBeam™ Research.
- JeffXXXResearch %22spherical+aberration%22 on eLibrary .
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