speckle image

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• Speckle imaging — (also known as video astronomy ) describes a range of high resolution astronomical imaging techniques based either on the shift and add ( image stacking ) method or on speckle interferometry methods. These techniques can dramatically increase the …   Wikipedia

• Speckle masking — (or bispectral analysis) is a speckle imaging method which involves estimation of the bispectrum or closure phases from each of the short exposures. The average bispectrum can then be calculated and then inverted to obtain an image. With a normal …   Wikipedia

• Speckle pattern — A speckle pattern is a random intensity pattern produced by the mutual interference of a set of wavefronts. This phenomenon has been investigated by scientists since the time of Newton, but speckles have come into prominence since the invention… …   Wikipedia

• speckle interferometry — noun : interferometry in which a composite image of an object is made by recording individual speckle images over a period of time ; specifically : such a technique used in astronomy to generate a clear image of a celestial body blurred by… …   Useful english dictionary

• Speckle-Interferometrie — Die Speckle Interferometrie ist ein Verfahren zur Vermessung kleiner Distanzänderungen. Kohärentes aufgeweitetes Laserlicht erzeugt auf einer Oberfläche Speckles. Durch Interferenz ändert sich das Muster, wenn Verspannungen in der reflektierenden …   Deutsch Wikipedia

• Speckle — Tavelure (optique) Pour les articles homonymes, voir Tavelure. Un exemple de tavelures obtenues avec un laser vert. Les tavelures ou chatoiement (speckle …   Wikipédia en Français

• speckle interferometry — Astron. a photographic technique for clarifying the telescopic images of a star by taking short exposures of the electronic images of the star s speckle pattern and extrapolating properties of the starlight to create a more accurate composite… …   Universalium

• speckle interferometry — noun Date: 1970 a technique for generating a clear composite image of a celestial object blurred by atmospheric turbulence in which a large number of short exposure photographs are mathematically correlated by a computer …   New Collegiate Dictionary

• Electronic speckle pattern interferometry — (ESPI) [Jones R Wykes C, Holographic and Speckle Interferometry, 1989, Cambridge University Press] , also known as TV Holography, is a technique which uses laser light, together with video detection, recording and processing to visualise static… …   Wikipedia

• Dynamic speckle — Figure 1 A dynamic speckle from a maize seed that seems to “boil” faster in the areas where the scatterers are more active, in this case in the embryo and in a river like in the crack. In physics, dynamic speckle is a result of the temporal… …   Wikipedia

• Eye testing using speckle — Laser speckle can be employed as a method for conducting a very sensitive eye test [Ennos AE, 1996, Phys. Educ, 31, 138 142] .When a surface is illuminated by a laser beam and is viewed by an observer, a speckle pattern is formed on the retina.… …   Wikipedia