Next: Comparison using a Up: Noise reduction from Previous: Adaptive filtering from . In the previous algorithm we do not use the hierarchy of structures. We have explored many approaches for introducing a non-linear hierarchical law in the adaptive filtering and we found that the best way was to link the threshold to the wavelet coefficient of the previous plane . ... and L is a threshold estimated by: . ... The function must return a value between 0 and 1. ... Mon Jan 22 15:08:15 MET 1996 ...

... Обзор LPR фильтра. Впечатления от наблюдений с LPR фильтром. ... Характеристики цветных фильтров Baader-Planetarium . Мой перевод pdf- файла о фильтрах с сайта Baader-Planetarium (379 кб) . ...

... Next: Star Finding and Up: Image Restoration and Previous: Multiresolution and Astronomical . ... Design improvements continue to be made in the filter developed using mathematical morphology principles for the Infrared Astronomical Satellite ( IRAS ) images. The purpose of this filter is to eliminate Galactic cirrus emission from extragalactic fields. ... With an appropriate normalization, the filter curve was applied to each pixel in the image to remove the Galactic cirrus. ...

... Extensive literature exists on the wavelet transform and its applications (Meyer 1991, Daubechies 1988, Chui 1992, Meyer 1990, Meyer 1992, Ruskai et al. 1992). ... when the wavelet function is defined by . ... The wavelet coefficients provide a mechanism to extract from the residuals at each iteration only the significant structures. ... is the restored image, which does not contain any noise, and is the final residual which does not contain any structure. is our estimation of the noise . ...

... Posts tagged ?spatial statistics? ... As a part of exploring spatial distribution of particles/objects, not to approximate via Poisson process or Gaussian process (parametric), nor to impose hypotheses such as homogenous, isotropic, or uniform, various nonparametric methods somewhat dragged my attention for data exploration and preliminary analysis. ... I decide to discuss Kalman Filter a while ago for the slog after finding out that this popular methodology is rather underrepresented in astronomy. ...

... Meta Index / Home Page / DSS utilities . ... This is similar to RangeT except that no type is given for the upper and lower bounds. Where I have translated GTIs into ranges (see for example section 9.6.3 ) I have taken the lower GTI bound to be INCLUSIVE and the upper to be EXCLUSIVE. ... For each GTI in the sequence, the upper bound value must exceed the lower bound value. For all i from 1 to N-1, the upper bound of GTI i must be less than the lower bound of GTI i+1. ... See also section 16 . ...

... 11 Yellow-Green (78% transmission): Contrasts well with the red and blue characteristics of surface features on Jupiter and Saturn. ... 82A Light Blue (73% transmission): Useful on the Moon, Mars, Jupiter, and Saturn, this subtle pale blue filter enhances areas of low contrast while avoiding significant reduction of overall image brightness. ... Meade Series 4000 Photo-Visual Color Filters may be ordered individually or in the following sets: . ... Meade Series 4000 Broadband Nebular Filters . ...

This home page belongs to small group of scientists working at . Sternberg Astronomical Institute which is a part of Moscow State University . ... Электронная библиотека научно-технической и художественной литературы (доступна только из ГАИШ) . ... Local staff . Dr. Edward Kononovich (konon -at- sai.msu.ru), Associate Professor . ... Dr. Sergey Ayukov (asv -at- sai.msu.ru), Research Fellow, Webmaster of the group . ... Joint seminar of Solar Studies Structure Group and Solar Photometry Group . ...

... 12.07.07 Nando - Test the magnitude of aperture corrections to Landoldt Apertures. ... 12.07.07 Palle - Write up some suggestions for tests to verify which FORS/UT combinations really have rotating features. Original text: Sabine's flatfield versus rotators angle look promising, but more tests should be done which do not depend on the structure looking like a finger. ... The halves could be either ordered by rot-angle (e.g. 0-180 together, 180-360 together), or totally random. ...

Metamaterial bandpass structures made of two-dimensional arrays of planar resonators Mikhail A.Tarasova, Artem M.Chekushkinb, Valerian S.Edelmanc, and Leonid S.Kuzmin a V.Kotel'nikov Institute of Radio Engineering and Electronics, Moscow, Russia b Chalmers University of Technology, Gothenburg, Sweden c P.Kapitza Institute for Physical problems b Abstract--Planar arrays of /2 open crosses designed for quasioptical filters in 300, 350, 450, 600 GHz bands were fabricated and experimentally studied. ...

A 2GHz Digital Filterbank Correlator Dick Ferris, CSIRO ATNF, John Bunton, CSIRO Telecommunications & Industrial Physics, & Bruno Stuber, Fachhochschule Solothurn Nordwestschweiz Abstract The combination of traditional polyphase filter architecture with a new multiplier-rich FPGA family provides the means to build wideband (GHz), flexible and high dynamic range filterbanks and FX correlators using a small number of commodity ICs. ... This is exactly the bottom channel of the DFT.) ...

An improved correlator for ALMA has been proposed by an European consortium including Astron (NL), Bordeaux University (FR), IRAM (FR) and Arcetri. ... The work in Arcetri has focused on the efficent design of a digital receiver, that exploits the peculiarities of the astronomical signal, i.e. the extremely coarse quantization and the stochastic nature of the input signal. ... A complex mixer followed by a two stage bandpass filter. ... Phase effects in a hybrid correlator . ...

... It contains 2 (1 for each polarization) by 4 separate filters that are switch able via the computer. filter 1 is a motor driven tuneable filter covering 1000 to 2000 Mhz with a 2% bandwidth. filter 2 is a ??? . ... An hp34907 dac generates a voltage that corresponds to the requested frequency. ... It steps the filter from 1000 to 2000 Mhz in 25 Mhz steps. ... You now have 41 requested voltages and measured frequencies going from 1000 to 2000 Mhz. ... 20 Mhz) when fit over the 1000 to 2000 Mhz range....

... Class . ... Package Hierarchies: . ... ij.plugin.filter. Analyzer (implements ij.measure. ... PlugInFilter ) . ... AVI_Writer (implements ij.plugin.filter. ... BackgroundSubtracter (implements ij.gui. DialogListener , ij.plugin.filter. ExtendedPlugInFilter ) . ... Benchmark (implements ij.plugin.filter. ... Binary (implements ij.gui. ... CalibrationBar (implements ij.plugin.filter. ... Convolver (implements java.awt.event.ActionListener, ij.gui. ... Duplicater (implements ij.plugin.filter. ...

Stellarium 0.12.3 . ... Classes . ... FileљStructure . ClassљList . ClassљIndex . ClassљHierarchy . ... ShortcutsFilterModel Class Reference . Custom filter class for filtering tree sub-items. More... #include < ShortcutsDialog.hpp > . ... filterAcceptsRow (int source_row, const QModelIndex &source_parent) const . ... The standard QSortFilterProxyModel shows child items only if the parent item matches the filter.) Definition at line 43 of file ShortcutsDialog.hpp . ...

M1 is also known as the Crab Nebula. It is a remant of a supernova that occured in 1054 AD. The central star is actually a rotating neutron star and is called a pulsar. This exposure was taken through a narrow band H-alpha filter to make the filamentary structure stand out somewhat.

... Parameters . Filters . ... Direct images . ... The SCORPIO-2 project: . Spectral Camera with Optical Reducer for Photometric and Interferometric Observations - 2 . The broad-band glass filters made in SAO RAS are used for the observation in the Johnson-Cousins (UBVRI) photometric system in the direct images mode. The glass filters transmission curves are shown by solid line. ... The filters transmission curves of the `comets' filters measured with the SCORPIO-2 in the F/4 beam. ...

neutral density filters . broad band filters (bandpass > 30nm) . ... Takes 50-mm square filters, up to 8-mm in thickness. Note: These filters are mounted in the slit mask wheel. ... The slit mask wheel pull down menu in the Remark DIS interface lists the filters and slits currently mounted in the wheel in the spectrograph. ... Will probably be able to accommodate 50-mm square filters, up to 20-mm in thickness (?) ... Takes 1.40-inch square filters, up to 0.315-inch in thickness. ...

... 8, ``Celestial Mechanics'', 2002 First results of GPS orbit determination with GRAPE package using a square--root information filter M. O. Keshin Institute of Applied Astronomy, St. Petersburg, Russia The zero--differenced carrier phase measurements contain the distance be­ tween the phase centres of receiver and transmitter antennas biased by unknown integer number of cycles (phase ambiguities). ... In the case of GPS the problem of solar radiation pressure modelling is of primary importance. ...

adapted from Observe: Eclipses, published in 1979 by the Astronomical League and "Safe Solar Filters," by B. Ralph Chou, Sky and Telescope, August 1981) . ... Tape TWO pieces of film together into a sandwich, and tape this over the opening in the cardboard. ... The cardboard frame will act as a shade from the bright Sun, while you safely observe through the film sandwich. ... Undeveloped film is not safe. ... tape . ... At the end of one of the tubes, tape the aluminum foil, and make a tiny pinhole. ...