Next: The Clark CLEAN Up: Image Deconvolution Previous: Introduction . The CLEAN algorithm (H?gbom 1974) (A&AS 15, 417) represents the image as a number of point sources in an otherwise empty field of view. ... The H?gbom CLEAN algorithm looks for the brightest (in an absolute sense) pixel (called a CLEAN component) in a specified region in the image (called the CLEAN window which must include all the real emission in the image). ... This subtracted image is called the residual image. ...

Next: To produce a region Up: Image Display in Xwindows Previous: General usage. ... Menu items are chosen by clicking any mouse button (cf. ... save current cursor as an include region (counts within region will be included in subsequent calculations) . ... When another image is displayed, the earlier one can be compared with it by pressing its respective mouse button with cursor in the main display window. ... Table 1: Detailed list of menu options . ... color . ... enter/leave region sub-menu . ...

... Bojan Nikolic web pages (r. 329) . ... The HУЖgbom ?CLEAN? is a simple algorithm for deconvolving images, that is, it is an algorithm to remove to an extent the smearing in an image due to a finite point-spread function. This algorithm is particularly applicable to making images from radio aperture synthesis array telescopes, where this algorithm (and other closely related) are the standard deconvolution approach. ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

... Please note that throughout this exercise you need some patience since the PEARL procedures use the Direct Fourier Transform which is quite slow for the size of map we are trying to work with! . ... Initial chisq= 24.980139 . SVD: will edit 0 singular values! ... Click Update to add the selected number of CLEAN component to the current model (which was empty at the start), self-calibrate the phases, subtract the CLEAN components from the data, and re-display the updated residual and final maps. ...

... Previous: ESO C Library for an Image Processing Software Environment (eclipse) . ... A new CLEAN-type algorithm searches for model components not in the dirty image but in the multi-resolution wavelet transform of the dirty image based on the dirty beam. ... The improvement of this prototype Wavelet CLEAN, which does convolve with the dirty beam, can be attributed to a suppression of noise and aliasing in the dirty image by use of information in the sidelobes of the whole image domain. ...

... GPI Data Pipeline 1.0 documentation . GPI Data Pipeline Developer?s Guide . Enter search terms or a module, class or function name. Pipeline Code Internal Organization . ... Function Call Hierarchy when Running Recipes . ... The GPI data pipeline is implemented in object-oriented fashion using IDL classes. ... For detailed documentation on the functions and variables internal to the following, please see the comments in the source code directly. ... The main object class of the pipeline! ...

XMM­Newton CCF Release Note XMM­CCF­REL­0103 EPIC MOS Spectral Response Distribution D Lumb January 8, 2002 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag EMOS1 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO EMOS2 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO 2 Changes In previous versions, the CCD efficiency was defined within a region described by a POLYGON function. The selectlib functionality can cause some inconsistency at the borders of such a region. ...

... In this first example, we allow an object to fall onto a small radar unit . The resulting Time-Frequency distribution is shown as a contour plot in Fig. 8 (a). Figure: FIGURE GOES SOMEWHERE IN THIS GENERAL VICINITY . ... Its density plot appears as an image in Fig. ... The response has a very high peak, as evidenced from Fig. ...

Next: Data Structures Up: Multi-Object Spectroscopy Previous: Fitting the dispersion . DEFINE/MOS helps you to localize your objects and sky regions and by default works automatically. ... In the averaged frame it tries to detect objects above the threshold ( ) within the search window and fits a gaussian to any detected object. ... SET/MOS def_mode=i . ... It may be advisable to do at least a rough sky subtraction ahead of this command to facilitate the detection of the objects. ...

... It was shown in the early 1980's that spectral lines formed around 1-2.5 x 10 5 K were enhanced in radiance by factors up to 15-25 over the normal quiet Sun. From the dynamical viewpoint, this would suggest a pressure imbalance between the sunspot and the surrounding region. ... Here, the electron density was evaluated over a bright sunspot plume region using lines within the O V 760? multiplet. ... The derived densities in all four regions are indicated. ...