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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_TRANSFORM2_CONVOLUTIONFUNCTION_H
30 : #define SYNTHESIS_TRANSFORM2_CONVOLUTIONFUNCTION_H
31 :
32 : #include <synthesis/TransformMachines2/CFTerms.h>
33 : #include <synthesis/TransformMachines2/CFStore.h>
34 : #include <synthesis/TransformMachines2/CFStore2.h>
35 : #include <synthesis/TransformMachines2/VB2CFBMap.h>
36 : #include <synthesis/TransformMachines2/PolOuterProduct.h>
37 : #include <synthesis/TransformMachines2/PointingOffsets.h>
38 : #include <synthesis/TransformMachines2/Utils.h>
39 : #include <casacore/images/Images/ImageInterface.h>
40 : #include <casacore/images/Images/TempImage.h>
41 : #include <casacore/casa/Logging/LogOrigin.h>
42 : #include <casacore/casa/Logging/LogSink.h>
43 : #include <casacore/casa/Logging/LogIO.h>
44 : #include <casacore/casa/Arrays/Vector.h>
45 : #define CF_TYPE casacore::Double
46 :
47 : namespace casa{
48 : namespace refim{
49 : // <summary>
50 : // The base class to compute convolution functions for convolutional gridding.
51 : // </summary>
52 :
53 : // <use visibility=export>
54 : // <prerequisite>
55 : // </prerequisite>
56 : // <etymology>
57 : // Class to encapsulate the convolution function for convolutional gridding.
58 : // </etymology>
59 : //
60 : // <synopsis> Standard method of re-sampling data to or from a
61 : //
62 : // regular grid is done by convolutional gridding. This requires a
63 : // convolution function which a finte support size and well behaved
64 : // function in the Fourier domain. For standard gridding, the
65 : // Prolate Spheroidal function are used. Convolution functions
66 : // used in casacore::Projection algorithms (like W-casacore::Projection, A-casacore::Projection,
67 : // etc. and their combinations) each require potentially different
68 : // mechanisms to compute. These are implemented in separate
69 : // classes in the Synthesis module. Since these are used in common
70 : // framework for gridding and de-gridding, these are all derived
71 : // from a common base class. ConvolutionFunction (this class) is
72 : // that base class.
73 : //
74 : // Most of the methods in this base class are pure virtual. I.e.,
75 : // only surviving offsprings (derived classes) of this class will
76 : // be those that will have the wisdom that they methods represent.
77 : //
78 : // </synopsis>
79 :
80 : class ConvolutionFunction
81 : {
82 : public:
83 8 : ConvolutionFunction():
84 8 : nDim(2),logIO_p(), spwChanSelFlag_p(), spwFreqSelection_p(),
85 8 : computeCFAngleRad_p(360.0*M_PI/180.0), rotateCFOTFAngleRad_p(0.1)
86 8 : {};
87 : ConvolutionFunction(casacore::Int dim):
88 : nDim(dim),logIO_p(), spwChanSelFlag_p(), spwFreqSelection_p(),
89 : computeCFAngleRad_p(360.0*M_PI/180.0), rotateCFOTFAngleRad_p(0.1)
90 : {nDim=dim;};
91 : virtual ~ConvolutionFunction();
92 :
93 : // Set the dimention of the convolution function.
94 0 : virtual void setDimension(casacore::Int n){nDim = n;};
95 :
96 : // Given the pixel co-ordinates and an offset values, this returns
97 : // the value of the convolution function. This is however not
98 : // used anywhere yet (and is therefore also not a pure virtual
99 : // function).
100 0 : virtual CF_TYPE getValue(casacore::Vector<CF_TYPE>& , casacore::Vector<CF_TYPE>& ) {return 0.0;};
101 :
102 : // A support function which, for now, returns and integer ID
103 : // corresponding to the on-sky frequency of the supplied VisBuffer.
104 : virtual int getVisParams(const VisBuffer2& vb,const casacore::CoordinateSystem& skyCoord=casacore::CoordinateSystem())=0;
105 :
106 : // This method computes the convolution function and the
107 : // convolution function used for gridding the weights (typically
108 : // these are the same) and returns them in the cfs and cfwts
109 : // parameters. The required information about the image and
110 : // visibility parameters is dervided from the given image and
111 : // VisBuffer objects. wConvSize is the number of w-term planes
112 : // and pa is the Parallactic Angle in radians for which the
113 : // convolution function(s) are computed.
114 : virtual void makeConvFunction(const casacore::ImageInterface<casacore::Complex>& image,
115 : const VisBuffer2& vb,
116 : const casacore::Int wConvSize,
117 : const casacore::CountedPtr<PolOuterProduct>& pop,
118 : const casacore::Float pa,
119 : const casacore::Float dpa,
120 : const casacore::Vector<casacore::Double>& uvScale, const casacore::Vector<casacore::Double>& uvOffset,
121 : const casacore::Matrix<casacore::Double>& vbFreqSelection,
122 : CFStore2& cfs,
123 : CFStore2& cfwts,
124 : casacore::Bool fillCF=true) = 0;
125 : // This method computes the average response function. This is
126 : // typically image-plane equivalent of the convolution functions,
127 : // averaged over various axis. The precise averaging will be
128 : // implementation dependent in the derived classes.
129 : virtual casacore::Bool makeAverageResponse(const VisBuffer2& vb,
130 : const casacore::ImageInterface<casacore::Complex>& image,
131 : casacore::ImageInterface<casacore::Float>& theavgPB,
132 : casacore::Bool reset=true) = 0;
133 : virtual casacore::Bool makeAverageResponse(const VisBuffer2& vb,
134 : const casacore::ImageInterface<casacore::Complex>& image,
135 : casacore::ImageInterface<casacore::Complex>& theavgPB,
136 : casacore::Bool reset=true) = 0;
137 :
138 : //
139 : virtual void setPolMap(const casacore::Vector<casacore::Int>& polMap) = 0;
140 0 : virtual void setSpwSelection(const casacore::Cube<casacore::Int>& spwChanSelFlag) {spwChanSelFlag_p.assign(spwChanSelFlag);}
141 0 : virtual void setSpwFreqSelection(const casacore::Matrix<casacore::Double>& spwFreqSel) {spwFreqSelection_p.assign(spwFreqSel);}
142 0 : virtual void setRotateCF(const casacore::Double& computeCFAngleRad, const casacore::Double& rotateOTF)
143 0 : {computeCFAngleRad_p=computeCFAngleRad; rotateCFOTFAngleRad_p = rotateOTF;};
144 :
145 : // virtual void setFeedStokes(const casacore::Vector<casacore::Int>& feedStokes) = 0;
146 : virtual casacore::Bool findSupport(casacore::Array<casacore::Complex>& func, casacore::Float& threshold,casacore::Int& origin, casacore::Int& R)=0;
147 : virtual casacore::Vector<casacore::Double> findPointingOffset(const casacore::ImageInterface<casacore::Complex>& image,
148 : const VisBuffer2& vb) = 0;
149 :
150 : // virtual void setParams(const casacore::Vector<casacore::Int>& polMap, const casacore::Vector<casacore::Int>& feedStokes)
151 : // {setPolMap(polMap); setFeedStokes(feedStokes);};
152 :
153 : // virtual void prepareConvFunction(const VisBuffer2& vb, CFStore2& cfs)=0;
154 : //virtual void prepareConvFunction(const VisBuffer2& vb, VBRow2CFBMapType& theMap)=0;
155 : virtual void prepareConvFunction(const VisBuffer2& vb, VB2CFBMap& theMap)=0;
156 : virtual casacore::Matrix<casacore::Int> makeBaselineList(const casacore::Vector<casacore::Int>& antList);
157 0 : virtual casacore::Int mapAntIDToAntType(const casacore::Int& /*ant*/) {return 0;};
158 0 : virtual void setMiscInfo(const casacore::RecordInterface& /*params*/) {};
159 0 : virtual casacore::CountedPtr<CFTerms> getTerm(const casacore::String& /*name*/) {return NULL;}
160 0 : virtual int getOversampling(){return 1;};
161 0 : virtual bool isWBAWP() {return false;};
162 : // virtual casacore::Vector<casacore::Vector<casacore::Double> > findPointingOffset(const casacore::ImageInterface<casacore::Complex>& image,
163 : // const VisBuffer2& vb, const casacore::Bool& doPointing) = 0;
164 :
165 :
166 :
167 : private:
168 : casacore::Int nDim;
169 : protected:
170 : casacore::LogIO& logIO() {return logIO_p;}
171 : casacore::LogIO logIO_p;
172 : casacore::Cube<casacore::Int> spwChanSelFlag_p;
173 : casacore::Matrix<casacore::Double> spwFreqSelection_p;
174 : casacore::Double computeCFAngleRad_p, rotateCFOTFAngleRad_p;
175 : };
176 : } // end namespace refim
177 : } // end namespace casa
178 :
179 : #endif
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