Line data    Source code

       1             : //# ConvolutionFunction.h: Definition for ConvolutionFunction
       2             : //# Copyright (C) 1996,1997,1998,1999,2000,2002
       3             : //# Associated Universities, Inc. Washington DC, USA.
       4             : //#
       5             : //# This library is free software; you can redistribute it and/or modify it
       6             : //# under the terms of the GNU Library General Public License as published by
       7             : //# the Free Software Foundation; either version 2 of the License, or (at your
       8             : //# option) any later version.
       9             : //#
      10             : //# This library is distributed in the hope that it will be useful, but WITHOUT
      11             : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12             : //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
      13             : //# License for more details.
      14             : //#
      15             : //# You should have received a copy of the GNU Library General Public License
      16             : //# along with this library; if not, write to the Free Software Foundation,
      17             : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
      18             : //#
      19             : //# Correspondence concerning AIPS++ should be adressed as follows:
      20             : //#        Internet email: casa-feedback@nrao.edu.
      21             : //#        Postal address: AIPS++ Project Office
      22             : //#                        National Radio Astronomy Observatory
      23             : //#                        520 Edgemont Road
      24             : //#                        Charlottesville, VA 22903-2475 USA
      25             : //#
      26             : //#
      27             : //# $Id$
      28             : 
      29             : #ifndef SYNTHESIS_CONVOLUTIONFUNCTION_H
      30             : #define SYNTHESIS_CONVOLUTIONFUNCTION_H
      31             : 
      32             : #include <synthesis/TransformMachines/CFStore.h>
      33             : #include <synthesis/TransformMachines/CFStore2.h>
      34             : #include <synthesis/TransformMachines/CFTerms.h>
      35             : #include <synthesis/TransformMachines/PolOuterProduct.h>
      36             : #include <synthesis/TransformMachines/Utils.h>
      37             : #include <casacore/images/Images/ImageInterface.h>
      38             : #include <casacore/images/Images/TempImage.h>
      39             : #include <casacore/casa/Logging/LogOrigin.h>
      40             : #include <casacore/casa/Logging/LogSink.h>
      41             : #include <casacore/casa/Logging/LogIO.h>
      42             : #include <casacore/casa/Arrays/Vector.h>
      43             : #define CF_TYPE casacore::Double
      44             : 
      45             : namespace casa{
      46             :   // <summary>  
      47             :   //  The base class to compute convolution functions for convolutional gridding. 
      48             :   // </summary>
      49             :   
      50             :   // <use visibility=export>
      51             :   // <prerequisite>
      52             :   // </prerequisite>
      53             :   // <etymology>
      54             :   //   Class to encapsulate the convolution function for convolutional gridding.
      55             :   // </etymology>
      56             :   //
      57             :   // <synopsis> Standard method of re-sampling data to or from a
      58             :   //
      59             :   //  regular grid is done by convolutional gridding.  This requires a
      60             :   //  convolution function which a finte support size and well behaved
      61             :   //  function in the Fourier domain.  For standard gridding, the
      62             :   //  Prolate Spheroidal function are used.  Convolution functions
      63             :   //  used in casacore::Projection algorithms (like W-casacore::Projection, A-casacore::Projection,
      64             :   //  etc. and their combinations) each require potentially different
      65             :   //  mechanisms to compute.  These are implemented in separate
      66             :   //  classes in the Synthesis module.  Since these are used in common
      67             :   //  framework for gridding and de-gridding, these are all derived
      68             :   //  from a common base class.  ConvolutionFunction (this class) is
      69             :   //  that base class.
      70             :   //
      71             :   //  Most of the methods in this base class are pure virtual.  I.e.,
      72             :   //  only surviving offsprings (derived classes) of this class will
      73             :   //  be those that will have the wisdom that they methods represent.
      74             :   //
      75             :   // </synopsis>
      76             : 
      77             :   class ConvolutionFunction
      78             :   {
      79             :   public:
      80          24 :     ConvolutionFunction():logIO_p(), computeCFAngleRad_p(360.0*M_PI/180.0), rotateCFOTFAngleRad_p(0.1) {};
      81             :     ConvolutionFunction(casacore::Int dim): computeCFAngleRad_p(360.0*M_PI/180.0), rotateCFOTFAngleRad_p(0.1) {nDim=dim;};
      82             :     virtual ~ConvolutionFunction();
      83             :     
      84             :     // Set the dimention of the convolution function.
      85           0 :     virtual void setDimension(casacore::Int n){nDim = n;};
      86             : 
      87             :     // Given the pixel co-ordinates and an offset values, this returns
      88             :     // the value of the convolution function.  This is however not
      89             :     // used anywhere yet (and is therefore also not a pure virtual
      90             :     // function).
      91           0 :     virtual CF_TYPE getValue(casacore::Vector<CF_TYPE>& , casacore::Vector<CF_TYPE>& ) {return 0.0;};
      92             : 
      93             :     // A support function which, for now, returns and integer ID
      94             :     // corresponding to the on-sky frequency of the supplied VisBuffer.
      95             :     virtual int getVisParams(const VisBuffer& vb,const casacore::CoordinateSystem& skyCoord=casacore::CoordinateSystem())=0;
      96             : 
      97             :     // This method computes the convolution function and the
      98             :     // convolution function used for gridding the weights (typically
      99             :     // these are the same) and returns them in the cfs and cfwts
     100             :     // parameters.  The required information about the image and
     101             :     // visibility parameters is dervided from the given image and
     102             :     // VisBuffer objects.  wConvSize is the number of w-term planes
     103             :     // and pa is the Parallactic Angle in radians for which the
     104             :     // convolution function(s) are computed.
     105             :     virtual void makeConvFunction(const casacore::ImageInterface<casacore::Complex>& image,
     106             :                                   const VisBuffer& vb,
     107             :                                   const casacore::Int wConvSize,
     108             :                                   const casacore::CountedPtr<PolOuterProduct>& pop,
     109             :                                   const casacore::Float pa, 
     110             :                                   const casacore::Float dpa, 
     111             :                                   const casacore::Vector<casacore::Double>& uvScale, const casacore::Vector<casacore::Double>& uvOffset,
     112             :                                   const casacore::Matrix<casacore::Double>& vbFreqSelection,
     113             :                                   CFStore2& cfs,
     114             :                                   CFStore2& cfwts,
     115             :                                   casacore::Bool fillCF=true) = 0;
     116             :     // This method computes the average response function.  This is
     117             :     // typically image-plane equivalent of the convolution functions,
     118             :     // averaged over various axis.  The precise averaging will be
     119             :     // implementation dependent in the derived classes.
     120             :     virtual casacore::Bool makeAverageResponse(const VisBuffer& vb, 
     121             :                                      const casacore::ImageInterface<casacore::Complex>& image,
     122             :                                      casacore::ImageInterface<casacore::Float>& theavgPB,
     123             :                                      casacore::Bool reset=true) = 0;
     124             :     virtual casacore::Bool makeAverageResponse(const VisBuffer& vb, 
     125             :                                      const casacore::ImageInterface<casacore::Complex>& image,
     126             :                                      casacore::ImageInterface<casacore::Complex>& theavgPB,
     127             :                                      casacore::Bool reset=true) = 0;
     128             : 
     129             :     //
     130             :     virtual void setPolMap(const casacore::Vector<casacore::Int>& polMap) = 0;
     131           0 :     virtual void setSpwSelection(const casacore::Cube<casacore::Int>& spwChanSelFlag) {spwChanSelFlag_p.assign(spwChanSelFlag);}
     132           0 :     virtual void setSpwFreqSelection(const casacore::Matrix<casacore::Double>& spwFreqSel) {spwFreqSelection_p.assign(spwFreqSel);}
     133           0 :     virtual void setRotateCF(const casacore::Double& computeCFAngleRad, const casacore::Double& rotateOTF) 
     134           0 :     {computeCFAngleRad_p=computeCFAngleRad; rotateCFOTFAngleRad_p = rotateOTF;};
     135             : 
     136             :     //    virtual void setFeedStokes(const casacore::Vector<casacore::Int>& feedStokes) = 0;
     137             :     virtual casacore::Bool findSupport(casacore::Array<casacore::Complex>& func, casacore::Float& threshold,casacore::Int& origin, casacore::Int& R)=0;
     138             :     virtual casacore::Vector<casacore::Double> findPointingOffset(const casacore::ImageInterface<casacore::Complex>& image,
     139             :                                               const VisBuffer& vb) = 0;
     140             : 
     141             :     // virtual void setParams(const casacore::Vector<casacore::Int>& polMap, const casacore::Vector<casacore::Int>& feedStokes)
     142             :     // {setPolMap(polMap); setFeedStokes(feedStokes);};
     143             : 
     144             :     //    virtual void prepareConvFunction(const VisBuffer& vb, CFStore2& cfs)=0;
     145             :     virtual void prepareConvFunction(const VisBuffer& vb, VBRow2CFBMapType& theMap)=0;
     146             :     virtual casacore::Matrix<casacore::Int> makeBaselineList(const casacore::Vector<casacore::Int>& antList);
     147           0 :     virtual casacore::Int mapAntIDToAntType(const casacore::Int& /*ant*/) {return 0;};
     148           0 :     virtual void setMiscInfo(const casacore::RecordInterface& /*params*/) {};
     149           0 :     virtual casacore::CountedPtr<CFTerms> getTerm(const casacore::String& /*name*/) {return NULL;}
     150             :   private:
     151             :     casacore::Int nDim;
     152             :   protected:
     153             :     casacore::LogIO& logIO() {return logIO_p;}
     154             :     casacore::LogIO logIO_p;
     155             :     casacore::Cube<casacore::Int> spwChanSelFlag_p;
     156             :     casacore::Matrix<casacore::Double> spwFreqSelection_p;
     157             :     casacore::Double computeCFAngleRad_p, rotateCFOTFAngleRad_p;
     158             :   };
     159             : 
     160             : };
     161             : 
     162             : #endif