WTerm.h

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00001 //# WTerm.h: Definition for WTerm
00002 //# Copyright (C) 2007
00003 //# Associated Universities, Inc. Washington DC, USA.
00004 //#
00005 //# This library is free software; you can redistribute it and/or modify it
00006 //# under the terms of the GNU Library General Public License as published by
00007 //# the Free Software Foundation; either version 2 of the License, or (at your
00008 //# option) any later version.
00009 //#
00010 //# This library is distributed in the hope that it will be useful, but WITHOUT
00011 //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00012 //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00013 //# License for more details.
00014 //#
00015 //# You should have received a copy of the GNU Library General Public License
00016 //# along with this library; if not, write to the Free Software Foundation,
00017 //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
00018 //#
00019 //# Correspondence concerning AIPS++ should be adressed as follows:
00020 //#        Internet email: aips2-request@nrao.edu.
00021 //#        Postal address: AIPS++ Project Office
00022 //#                        National Radio Astronomy Observatory
00023 //#                        520 Edgemont Road
00024 //#                        Charlottesville, VA 22903-2475 USA
00025 //#
00026 //#
00027 //# $Id$
00028 
00029 #ifndef SYNTHESIS_WTERM_H
00030 #define SYNTHESIS_WTERM_H
00031 
00032 
00033 #include <casa/Arrays/Vector.h>
00034 #include <msvis/MSVis/VisBuffer.h>
00035 #include <images/Images/ImageInterface.h>
00036 #include <images/Images/PagedImage.h>
00037 #include <images/Images/TempImage.h>
00038 #include <synthesis/TransformMachines/CFTerms.h>
00039 
00040 
00041 namespace casa{
00042   // <summary>  A class to apply the W-Term to the given image </summary>
00043   
00044   // <use visibility=export>
00045   // <prerequisite>
00046   // </prerequisite>
00047   // <etymology>
00048   // W-Term to account for non co-planar baselines
00049   // </etymology>
00050   //
00051   // <synopsis> 
00052   // 
00053   //</synopsis>
00054   class WTerm: public CFTerms
00055   {
00056   public:
00057     WTerm () : CFTerms() {};
00058     ~WTerm () {};
00059 
00060     virtual void applySky(Matrix<Complex>& screen, 
00061                           const Int wPixel, 
00062                           const Vector<Double>& sampling,
00063                           const Double wScale,
00064                           const Int inner);
00065     virtual void applySky(Matrix<Complex>& screen, 
00066                           const Vector<Double>& sampling,
00067                           const Double wValue,
00068                           const Int inner);
00069     int getVisParams(const VisBuffer& vb,const CoordinateSystem& skyCoord=CoordinateSystem()) 
00070     {(void)vb;(void)skyCoord;return 0;};
00071     void setPolMap(const Vector<Int>& polMap) {(void)polMap;};
00072     virtual Float getSupportThreshold() {return 1e-3;};
00073 
00074     // WTerm normalizes the image be unity
00075     virtual void normalizeImage(Lattice<Complex>& skyImage,
00076                                 const Matrix<Float>& weights) 
00077     {(void)skyImage;(void)weights;};
00078     virtual String name() {return String("W Term");};
00079     //
00080     // The following functions are not required for W-Term but need to
00081     // be implemented here since they are pure virtuals in CFTerms
00082     // base class.
00083     void applySky(ImageInterface<Float>&,// outputImages,
00084                   const VisBuffer&,// vb, 
00085                   const Bool,/* doSquint=True,*/
00086                   const Int&,/* cfKey=0,*/
00087                   const Int&,/* muellerTerm=0,*/
00088                   const Double /*freqVal*=-1*/) 
00089     {};
00090     void applySky(ImageInterface<Complex>&,// outputImages,
00091                   const VisBuffer&,// vb, 
00092                   const Bool,/* doSquint=True,*/
00093                   const Int&,/* cfKey=0,*/
00094                   const Int&,/* muellerTerm=0,*/
00095                   const Double /*freqVal=-1*/) 
00096     {};
00097     Vector<Int> vbRow2CFKeyMap(const VisBuffer& vb, Int& nUnique) 
00098     {(void)vb;(void)nUnique;return Vector<Int>();};
00099     Int makePBPolnCoords(const VisBuffer& vb,
00100                          const Int& convSize,
00101                          const Int& convSampling,
00102                          const CoordinateSystem& skyCoord,
00103                          const Int& skyNx, const Int& skyNy,
00104                          CoordinateSystem& feedCoord) 
00105     {
00106       (void)vb;(void)convSize;(void)convSampling;(void)skyCoord;(void)skyNx;(void)skyNy;(void)feedCoord;
00107       return 0;
00108     };
00109 
00110     Bool rotationallySymmetric() {return True;};
00111 
00112 
00113     Int getConvSize() {return 0;};
00114     Int getOversampling() {return 4;};
00115     Float getConvWeightSizeFactor() {return 1.0;};
00116   };
00117 
00118 };
00119 
00120 #endif
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