Line data Source code
1 : //# ImageMSCleaner.h: this defines Cleaner a class for doing convolution
2 : //# Copyright (C) 1996,1997,1998,1999,2000,2001,2002,2003
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 addressed 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_IMAGEMSCLEANER_H
30 : #define SYNTHESIS_IMAGEMSCLEANER_H
31 :
32 : //# Includes
33 : #include <synthesis/MeasurementEquations/MatrixCleaner.h>
34 : #include <casacore/casa/Arrays/ArrayFwd.h>
35 :
36 : namespace casacore{
37 :
38 : template <class T> class ImageInterface;
39 :
40 : }
41 :
42 : namespace casa { //# NAMESPACE CASA - BEGIN
43 :
44 : //# Forward Declarations
45 :
46 :
47 :
48 : // <summary>A class interfacing images to MatrixCleaner </summary>
49 :
50 : // <use visibility=export>
51 :
52 : // <reviewed reviewer="" date="yyyy/mm/dd" tests="tLatticeCleaner">
53 : // </reviewed>
54 :
55 : // <prerequisite>
56 : // <li> ImageInterface
57 : // <li> MatrixCleaner
58 : // </prerequisite>
59 : //
60 : // <etymology>
61 :
62 : // The ImageCleaner class will use MSClean on Images.
63 :
64 : // </etymology>
65 : //
66 : // <synopsis>
67 : // This class will perform various types of Clean deconvolution
68 : // on Lattices.
69 : //
70 : // </synopsis>
71 : //
72 : // <example>
73 : // <srcblock>
74 : // </srcblock>
75 : // </example>
76 : //
77 : // <motivation>
78 : // </motivation>
79 : //
80 : // <thrown>
81 : // <li> casacore::AipsError: if psf has more dimensions than the model.
82 : // </thrown>
83 : //
84 :
85 : class ImageMSCleaner
86 :
87 : {
88 :
89 : public:
90 : //Default
91 : ImageMSCleaner();
92 : // Create a cleaner with a psf and dirty image
93 : ImageMSCleaner(casacore::ImageInterface<casacore::Float>& psf, casacore::ImageInterface<casacore::Float>& dirty);
94 : //assignmemnt constructor
95 : ImageMSCleaner(const ImageMSCleaner& other);
96 : //assignment operator
97 : ImageMSCleaner & operator=(const ImageMSCleaner & other);
98 :
99 : //The destructor
100 : ~ImageMSCleaner();
101 :
102 : // Update the dirty image only
103 : void update(casacore::ImageInterface<casacore::Float> & dirty);
104 : // Change the psf image
105 : void setPsf(casacore::ImageInterface<casacore::Float> & psf);
106 :
107 : //// Set a number of scale sizes. The units of the scale are pixels.
108 : void setscales(const casacore::Int nscales, const casacore::Float scaleInc=1.0);
109 : // Set a specific set of scales
110 : void setscales(const casacore::Vector<casacore::Float> & scales);
111 :
112 : // Set up control parameters
113 : // cleanType - type of the cleaning algorithm to use (HOGBOM, MULTISCALE)
114 : // niter - number of iterations
115 : // gain - loop gain used in cleaning (a fraction of the maximum
116 : // subtracted at every iteration)
117 : // aThreshold - absolute threshold to stop iterations
118 : // fThreshold - fractional threshold (i.e. given w.r.t. maximum residual)
119 : // to stop iterations. This parameter is specified as
120 : // casacore::Quantity so it can be given in per cents.
121 : casacore::Bool setcontrol(casacore::CleanEnums::CleanType cleanType, const casacore::Int niter,
122 : const casacore::Float gain, const casacore::Quantity& aThreshold,
123 : const casacore::Quantity& fThreshold);
124 :
125 : // This version of the method disables stopping on fractional threshold
126 : casacore::Bool setcontrol(casacore::CleanEnums::CleanType cleanType, const casacore::Int niter,
127 : const casacore::Float gain, const casacore::Quantity& threshold);
128 :
129 : // return how many iterations we did do
130 : casacore::Int iteration() const ;
131 : casacore::Int numberIterations() const ;
132 :
133 : // what iteration number to start on
134 : void startingIteration(const casacore::Int starting = 0);
135 :
136 : // Clean an image.
137 : //return value gives you a hint of what's happening
138 : // 1 = converged
139 : // 0 = not converged but behaving normally
140 : // -1 = not converged and stopped on cleaning consecutive smallest scale
141 : // -2 = not converged and either large scale hit negative or diverging
142 : // -3 = clean is diverging rather than converging
143 : casacore::Int clean(casacore::ImageInterface<casacore::Float> & model, const casacore::String& algorithm,
144 : const casacore::Int niter, const casacore::Float gain, const casacore::Quantity& threshold,
145 : const casacore::Quantity& fthresh=casacore::Quantity(0.0, "%"),
146 : casacore::Bool doPlotProgress=false);
147 : // Set the mask
148 : // mask - input mask lattice
149 : // maskThreshold - if positive, the value is treated as a threshold value to determine
150 : // whether a pixel is good (mask value is greater than the threshold) or has to be
151 : // masked (mask value is below the threshold). Negative threshold switches mask clipping
152 : // off. The mask value is used to weight the flux during cleaning. This mode is used
153 : // to implement cleaning based on the signal-to-noise as opposed to the standard cleaning
154 : // based on the flux. The default threshold value is 0.9, which ensures the behavior of the
155 : // code is exactly the same as before this parameter has been introduced.
156 0 : void setMask(casacore::ImageInterface<casacore::Float> & mask, const casacore::Float& maskThreshold = 0.9);
157 : // Tell the algorithm to NOT clean just the inner quarter
158 : // (This is useful when multiscale clean is being used
159 : // inside a major cycle for MF or WF algorithms)
160 : // if true, the full image deconvolution will be attempted
161 : void ignoreCenterBox(casacore::Bool ign) ;
162 : // Consider the case of a point source:
163 : // the flux on all scales is the same, and the first scale will be chosen.
164 : // Now, consider the case of a point source with a *little* bit of extended structure:
165 : // thats right, the largest scale will be chosen. In this case, we should provide some
166 : // bias towards the small scales, or against the large scales. We do this in
167 : // an ad hoc manner, multiplying the maxima found at each scale by
168 : // 1.0 - itsSmallScaleBias * itsScaleSizes(scale)/itsScaleSizes(nScalesToClean-1);
169 : // Typical bias values range from 0.2 to 1.0.
170 : void setSmallScaleBias(const casacore::Float x=0.5);
171 : // During early iterations of a cycled casacore::MS Clean in mosaicing, it common
172 : // to come across an ocsilatory pattern going between positive and
173 : // negative in the large scale. If this is set, we stop at the first
174 : // negative in the largest scale.
175 : void stopAtLargeScaleNegative() ;
176 : // Some algorithms require that the cycles be terminated when the image
177 : // is dominated by point sources; if we get nStopPointMode of the
178 : // smallest scale components in a row, we terminate the cycles
179 : void stopPointMode(casacore::Int nStopPointMode) ;
180 : // After completion of cycle, querry this to find out if we stopped because
181 : // of stopPointMode
182 : casacore::Bool queryStopPointMode() const ;
183 : // speedup() will speed the clean iteration by raising the
184 : // threshold. This may be required if the threshold is
185 : // accidentally set too low (ie, lower than can be achieved
186 : // given errors in the approximate PSF).
187 : //
188 : // threshold(iteration) = threshold(0)
189 : // * ( exp( (iteration - startingiteration)/Ndouble )/ 2.718 )
190 : // If speedup() is NOT invoked, no effect on threshold
191 : void speedup(const casacore::Float Ndouble);
192 :
193 : //Max residual after last clean
194 0 : casacore::Float maxResidual() {return maxResidual_p;};
195 :
196 : private:
197 : //Helper function to setup some param
198 : casacore::Bool setupMatCleaner(const casacore::String& alg, const casacore::Int niter, const casacore::Float gain,
199 : const casacore::Quantity& threshold, const casacore::Quantity& fthresh=casacore::Quantity(0.0, "%"));
200 : MatrixCleaner matClean_p;
201 : casacore::ImageInterface<casacore::Float>* psf_p;
202 : casacore::ImageInterface<casacore::Float>* dirty_p;
203 : casacore::ImageInterface<casacore::Float>* mask_p;
204 : casacore::Int nPsfChan_p;
205 : casacore::Int nImChan_p;
206 : casacore::Int nPsfPol_p;
207 : casacore::Int nImPol_p;
208 : casacore::Int chanAxis_p;
209 : casacore::Int polAxis_p;
210 : casacore::Int nMaskChan_p;
211 : casacore::Int nMaskPol_p;
212 : casacore::Vector<casacore::Float> scales_p;
213 : casacore::Float maskThresh_p;
214 : casacore::Float maxResidual_p;
215 :
216 : };
217 :
218 : } //# NAMESPACE CASA - END
219 :
220 : #endif
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