Line data Source code
1 : //# ImagePolarimetry.h: Polarimetric analysis of images
2 : //# Copyright (C) 1996,1997,1998,1999,2000,2001,2002
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 addressed as follows:
20 : //# Internet email: casa-feedback@nrao.edu.
21 : //# Postal address: AIPS++ Project Office
22 : //# National Radio Astronomy Observatory
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24 : //# Charlottesville, VA 22903-2475 USA
25 : //#
26 : //# $Id: ImagePolarimetry.h 19817 2006-12-22 05:24:00Z gvandiep $
27 :
28 : #ifndef IMAGES_IMAGEPOLARIMETRY_H
29 : #define IMAGES_IMAGEPOLARIMETRY_H
30 :
31 : #include <casacore/casa/aips.h>
32 : #include <casacore/casa/Arrays/Vector.h>
33 : #include <casacore/casa/Containers/Block.h>
34 : #include <casacore/measures/Measures/Stokes.h>
35 : #include <casacore/casa/BasicSL/Complex.h>
36 : #include <casacore/images/Images/ImageInterface.h>
37 : #include <casacore/scimath/Fitting/LinearFitSVD.h>
38 :
39 : #include <imageanalysis/ImageTypedefs.h>
40 :
41 : namespace casacore{
42 :
43 : template <class T> class SubImage;
44 : template <class T> class ImageExpr;
45 : template <class T> class Quantum;
46 : template <class T> class LatticeStatistics;
47 : class CoordinateSystem;
48 : class IPosition;
49 : class LatticeExprNode;
50 : class LCBox;
51 : class LogIO;
52 : }
53 :
54 : namespace casa {
55 :
56 : // <summary>
57 : // Polarimetric analysis of images
58 : // </summary>
59 :
60 : // <use visibility=export>
61 :
62 : // <reviewed reviewer="" date="yyyy/mm/dd" tests="" demos="">
63 : // </reviewed>
64 :
65 : // <prerequisite>
66 : // <li> <linkto class=casacore::ImageExpr>ImageExpr</linkto>
67 : // <li> <linkto class=casacore::ImageInterface>ImageInterface</linkto>
68 : // </prerequisite>
69 :
70 : // <etymology>
71 : // Polarimetric analysis of Images
72 : // </etymology>
73 :
74 : // <synopsis>
75 : // This class provides polarimetric image analysis capability.
76 : // It takes an image with a casacore::Stokes axis (some combination
77 : // of IQUV is needed) as its input.
78 : //
79 : // Many functions return casacore::ImageExpr objects. These are
80 : // read-only images.
81 : //
82 : // Sometimes the standard deviation of the noise is needed.
83 : // This is for debiasing polarized intensity images or working out
84 : // error images. By default it is worked out for you with a
85 : // clipped mean algorithm. However, you can provide sigma if you
86 : // know it accurately. It should be the standard deviation of the noise in
87 : // the absence of signal. You won't measure that very well from
88 : // casacore::Stokes I if it is dynamic range limited. Better to get it from
89 : // V or Q or U. When this class needs the standard deviation of
90 : // the noise, it will try and get it from V or Q and U and finally I.
91 : //
92 : // However, note that the functions sigmaStokes{I,Q,U,V} DO return the standard
93 : // deviation of the noise for that specific casacore::Stokes type.
94 : //
95 : // The ImageExpr objects returned have the brightness units and ImageInfo
96 : // set. The MiscInfo (a permanent record) and logSink are not set.
97 : //
98 : // </synopsis>
99 : //
100 : // <motivation>
101 : // Basic image analysis capability
102 : // </motivation>
103 :
104 : // <todo asof="1999/11/01">
105 : // <li> plotting for function rotationMeasure
106 : // <li> some assessment of the curvature of pa-l**2
107 : // </todo>
108 :
109 : class ImagePolarimetry {
110 : public:
111 :
112 : // casacore::Stokes types
113 : enum StokesTypes {I, Q, U, V};
114 :
115 : // Constructor. The input image must have a Stokes
116 : // axis with some subset of I,Q,U, and V
117 : ImagePolarimetry (const casacore::ImageInterface<casacore::Float>& image);
118 :
119 : // Copy constructor (reference semantics)
120 : ImagePolarimetry(const ImagePolarimetry& other);
121 :
122 : // Destructor
123 : ~ImagePolarimetry ();
124 :
125 : // Assignment operator (reference semantics)
126 : ImagePolarimetry& operator=(const ImagePolarimetry& other);
127 :
128 : // Summary. Just invokes the casacore::ImageSummary list function
129 : // to summarize the header of the construction image
130 : void summary(casacore::LogIO& os) const;
131 :
132 : // Get the casacore::ImageInterface pointer of the construction image
133 : // Don't delete it !
134 15 : SPCIIF imageInterface() const {
135 15 : return _image;
136 : }
137 :
138 : // Get the casacore::CoordinateSystem of the construction image
139 64 : casacore::CoordinateSystem coordinates() const {
140 64 : return _image->coordinates();
141 : }
142 :
143 : // Get the shape of the construction image
144 64 : casacore::IPosition shape() const {
145 64 : return _image->shape();
146 : }
147 :
148 : // Is the construction image masked ?
149 0 : casacore::Bool isMasked() const {
150 0 : return _image->isMasked();
151 : }
152 :
153 : // Get the shape and casacore::CoordinateSystem of an image for a single
154 : // Stokes pixel. Thus, if the construction image shape was [10,10,4,20]
155 : // where axis 2 (shape 4) is the casacore::Stokes axis, this function
156 : // would return [10,10,1,20] Specify the type of casacore::Stokes pixel
157 : // you want.
158 : casacore::IPosition singleStokesShape(
159 : casacore::CoordinateSystem& cSys, casacore::Stokes::StokesTypes type
160 : ) const;
161 :
162 : // Complex linear polarization
163 : casacore::ImageExpr<casacore::Complex> complexLinearPolarization ();
164 :
165 : // casacore::Complex fractional linear polarization
166 : casacore::ImageExpr<casacore::Complex>
167 : complexFractionalLinearPolarization ();
168 :
169 : // Get the Stokes I image and the standard deviation of the
170 : // I image. This is worked out by first clipping
171 : // outliers from the mean at the specified level.
172 : // <group>
173 : casacore::ImageExpr<casacore::Float> stokesI() const;
174 : casacore::Float sigmaStokesI (casacore::Float clip=10.0);
175 : // </group>
176 :
177 : // Get the casacore::Stokes Q image and the standard deviation
178 : // of the Q image. This is worked out by first clipping
179 : // outliers from the mean at the specified level.
180 : // <group>
181 : casacore::ImageExpr<casacore::Float> stokesQ() const;
182 : casacore::Float sigmaStokesQ (casacore::Float clip=10.0);
183 : // </group>
184 :
185 : // Get the casacore::Stokes U image and the standard deviation
186 : // of the U image. This is worked out by first clipping
187 : // outliers from the mean at the specified level.
188 : // <group>
189 : casacore::ImageExpr<casacore::Float> stokesU() const;
190 : casacore::Float sigmaStokesU (casacore::Float clip=10.0);
191 : // </group>
192 :
193 : // Get the casacore::Stokes V image and the standard deviation
194 : // of the V image. This is worked out by first clipping
195 : // outliers from the mean at the specified level.
196 : // <group>
197 : casacore::ImageExpr<casacore::Float> stokesV() const;
198 : casacore::Float sigmaStokesV (casacore::Float clip=10.0);
199 : // </group>
200 :
201 : // Get the specified casacore::Stokes image and the standard deviation
202 : // of the image. This is worked out by first clipping
203 : // outliers from the mean at the specified level.
204 : // <group>
205 : casacore::ImageExpr<casacore::Float> stokes(
206 : ImagePolarimetry::StokesTypes index
207 : ) const;
208 : casacore::Float sigmaStokes (
209 : ImagePolarimetry::StokesTypes index, casacore::Float clip=10.0
210 : );
211 : // </group>
212 :
213 : // Get the best estimate of the statistical noise. This gives you the
214 : // standard deviation with outliers from the mean clipped first. The idea is
215 : // to not be confused by source or dynamic range issues. Generally Stokes V
216 : // is empty of sources (not always), then Q and U are generally less bright
217 : // than I. So this function first tries V, then Q and U and lastly I to
218 : // give you its noise estimate
219 : casacore::Float sigma(casacore::Float clip=10.0);
220 :
221 : // Get the linearly polarized intensity image and its
222 : // standard deviation. If wish to debias the image, you
223 : // can either provide <src>sigma</src> (the standard
224 : // deviation of the termal noise ) or if <src>sigma</src> is non-positive,
225 : // it will be worked out for you with a clipped mean algorithm.
226 : // <group>
227 : casacore::Float sigmaLinPolInt(
228 : casacore::Float clip=10.0, casacore::Float sigma=-1.0
229 : );
230 : // </group>
231 :
232 : // Get the total polarized intensity (from whatever combination
233 : // of Q, U, and V the construction image has) image and its error
234 : // (standard deviation). If wish to debias the image, you
235 : // can either provide <src>sigma</src> (the standard deviation
236 : // of the thermal noise) or if <src>sigma</src> is
237 : // non-positive, it will be worked out for you with a
238 : // clipped mean algorithm.
239 : // <group>
240 : casacore::ImageExpr<casacore::Float> totPolInt(
241 : casacore::Bool debias, casacore::Float clip=10.0,
242 : casacore::Float sigma=-1.0
243 : );
244 :
245 : casacore::Float sigmaTotPolInt(
246 : casacore::Float clip=10.0, casacore::Float sigma=-1.0
247 : );
248 : // </group>
249 :
250 : // Get linearly polarized position angle (degrees or radians) image
251 : // and error (standard deviation). If you provide
252 : // <src>sigma</src> it is the standard deviation of
253 : // the termal noise. If <src>sigma</src> is non-positive, it will be
254 : // worked out for you with a clipped mean algorithm.
255 : // <group>
256 : casacore::ImageExpr<casacore::Float> linPolPosAng(
257 : casacore::Bool radians
258 : ) const;
259 :
260 : casacore::ImageExpr<casacore::Float> sigmaLinPolPosAng(
261 : casacore::Bool radians, casacore::Float clip=10.0,
262 : casacore::Float sigma=-1.0
263 : );
264 : // </group>
265 :
266 : // Get fractional linear polarization image
267 : // and error (standard deviation). If wish to debias the image, you
268 : // can either provide <src>sigma</src> (the standard
269 : // deviation of the termal noise) or if <src>sigma</src> is non-positive,
270 : // it will be worked out for you with a clipped mean algorithm.
271 : // <group>
272 : casacore::ImageExpr<casacore::Float> fracLinPol(
273 : casacore::Bool debias, casacore::Float clip=10.0,
274 : casacore::Float sigma=-1.0
275 : );
276 :
277 : casacore::ImageExpr<casacore::Float> sigmaFracLinPol(
278 : casacore::Float clip=10.0, casacore::Float sigma=-1.0
279 : );
280 : // </group>
281 :
282 : // Get Fractional total polarization and error (standard deviation)
283 : // <src>var</src> is the standard deviation of the thermal noise.
284 : // If <src>sigma</src> is non-positive,
285 : // it will be worked out for you with a clipped mean algorithm.
286 : // <group>
287 : casacore::ImageExpr<casacore::Float> fracTotPol(
288 : casacore::Bool debias, casacore::Float clip=10.0,
289 : casacore::Float sigma=-1.0
290 : );
291 : casacore::ImageExpr<casacore::Float> sigmaFracTotPol(
292 : casacore::Float clip=10.0, casacore::Float sigma=-1.0
293 : );
294 : // </group>
295 :
296 : // Fourier Rotation Measure. The output image is the complex polarization
297 : // (Q + iU) with the spectral axis replaced by a RotationMeasure axis. The
298 : // appropriate shape and casacore::CoordinateSystem must be obtained with
299 : // function singleStokesShape (ask for type STokes::Plinear).
300 : // Howeverm this function will replace the casacore::SpectralCoordinate
301 : // by a LinearCoordinate describing the Rotation Measure.
302 : // casacore::ImageInfo, and Units are copied to the output. MiscInfo and
303 : // history are not. If the output has a mask,
304 : // and the input is masked, the mask is copied. If the output
305 : // has a mask, it should already have been initialized to true
306 : void fourierRotationMeasure(
307 : casacore::ImageInterface<casacore::Complex>& pol,
308 : casacore::Bool zeroZeroLag
309 : );
310 :
311 : // This function is used in concert with the rotationMeasure function.
312 : // It tells you what the shape of the output RM image should be, and
313 : // gives you its CoordinateSystem. Because the ImagePolarimetry
314 : // construction image may house the frequencies coordinate description
315 : // in a Spectral, Tabular or Linear coordinate, you may explicitly
316 : // specify which axis is the Spectral axis (spectralAxis). By default,
317 : // it tries to find the SpectralCoordinate. If there is none, it will
318 : // look for Tabular or Linear coordinates with a "FREQ" label.
319 : // It returns to you the frequencyAxis (i.e. the one it is concluded
320 : // houses the frequency spectrum) and the stokesAxis that it
321 : // finds.
322 : casacore::IPosition rotationMeasureShape(
323 : casacore::CoordinateSystem& cSys, casacore::Int& frequencyAxis,
324 : casacore::Int& stokesAxis, casacore::LogIO& os,
325 : casacore::Int spectralAxis=-1
326 : ) const;
327 :
328 : // This function is used in concert with the rotationMeasure function.
329 : // It tells you what the shape of the output Position Angle image should be,
330 : // and gives you its CoordinateSystem. Because the ImagePolarimetry
331 : // construction image may house the frequencies coordinate description
332 : // in a Spectral, Tabular or Linear coordinate, you may explicitly
333 : // specify which axis is the Spectral axis (spectralAxis). By default,
334 : // it tries to find the SpectralCoordinate. If there is none, it will
335 : // look for Tabular or Linear coordinates with a "FREQ" label.
336 : casacore::IPosition positionAngleShape(
337 : casacore::CoordinateSystem& cSys, casacore::Int& frequencyAxis,
338 : casacore::Int& stokesAxis, casacore::LogIO& os,
339 : casacore::Int spectralAxis=-1
340 : ) const;
341 :
342 : // This function applies a traditional (i.e. non-Fourier) Rotation Measure
343 : // algorithm (Leahy et al, A&A, 156, 234) approach. For the RM images
344 : // you must get the shape and CoordinateSYstem from function
345 : // rotationMeasureShape. For the position angle images, use function
346 : // singleStokesShape. Null pointer ImageInterface objects are
347 : // not accessed so you can select which output images you want.
348 : // Any output images not masked will be given a mask.
349 : // The position angles are all in degrees. The RM images in rad/m/m.
350 : // ImageInfo and Units, are copied to the output. MiscInfo and history are
351 : // not. You specify which axis houses the frequencies, the noise level of
352 : // Q and U if you know it (by default it is worked out for you)
353 : // for error images, the value of the foreground RM if you know it
354 : // (helps for unwinding ambiguity), the absolute maximum RM it should
355 : // solve for, and the maximum error in the position angle that should
356 : // be allowed. The state of the plotter should be set by the caller
357 : // (e.g. character size, number of plots in x and y etc).
358 : void rotationMeasure(
359 : casacore::ImageInterface<casacore::Float>*& rmPtr,
360 : casacore::ImageInterface<casacore::Float>*& rmErrPtr,
361 : casacore::ImageInterface<casacore::Float>*& pa0Ptr,
362 : casacore::ImageInterface<casacore::Float>*& pa0ErrPtr,
363 : casacore::ImageInterface<casacore::Float>*& nTurns,
364 : casacore::ImageInterface<casacore::Float>*& rChiSqPtr,
365 : casacore::Int spectralAxis, casacore::Float rmMax,
366 : casacore::Float maxPaErr=1.0e30, casacore::Float sigma=-1.0,
367 : casacore::Float rmFg=0.0, casacore::Bool showProgress=false
368 : );
369 :
370 : // Depolarization ratio image and error. Requires two images hence static
371 : // functions.
372 : // <group>
373 : static casacore::ImageExpr<casacore::Float> depolarizationRatio(
374 : const casacore::ImageInterface<casacore::Float>& im1,
375 : const casacore::ImageInterface<casacore::Float>& im2,
376 : casacore::Bool debias, casacore::Float clip=10.0,
377 : casacore::Float sigma=-1.0
378 : );
379 :
380 : static casacore::ImageExpr<casacore::Float> sigmaDepolarizationRatio(
381 : const casacore::ImageInterface<casacore::Float>& im1,
382 : const casacore::ImageInterface<casacore::Float>& im2,
383 : casacore::Bool debias, casacore::Float clip=10.0,
384 : casacore::Float sigma=-1.0
385 : );
386 : // </group>
387 :
388 : private:
389 : static const map<StokesTypes, casacore::String> polMap;
390 :
391 : SPCIIF _image = nullptr;
392 : // const casacore::ImageInterface<casacore::Float>* _image;
393 : casacore::LinearFitSVD<casacore::Float>* _fitter = nullptr;
394 : casacore::Float _oldClip = 0.0;
395 :
396 : // These blocks are always size 4, with IQUV in slots 0,1,2,3
397 : // If your image is IV only, they still use slots 0 and 3
398 :
399 : casacore::PtrBlock<casacore::ImageInterface<casacore::Float>*> _stokes {};
400 : casacore::PtrBlock<casacore::LatticeStatistics<casacore::Float>*>
401 : _stokesStats {};
402 :
403 : casacore::Matrix<casacore::Bool> _beamsEqMat {};
404 :
405 :
406 : // Delete all private pointers
407 : void _cleanup();
408 :
409 : // For traiditional RM approach, give output a mask if possible
410 : casacore::Bool _dealWithMask(
411 : casacore::Lattice<casacore::Bool>*& pMask,
412 : casacore::ImageInterface<casacore::Float>*& pIm, casacore::LogIO& os,
413 : const casacore::String& type
414 : ) const;
415 :
416 : // Change the Stokes Coordinate for the given float image to be of the
417 : // specified Stokes type
418 : void _fiddleStokesCoordinate(
419 : casacore::ImageInterface<casacore::Float>& ie,
420 : casacore::Stokes::StokesTypes type
421 : ) const;
422 :
423 : void _fiddleStokesCoordinate(
424 : casacore::CoordinateSystem& cSys, casacore::Stokes::StokesTypes type
425 : ) const;
426 :
427 : // Change the casacore::Stokes casacore::Coordinate for the given complex
428 : // image to be of the specified casacore::Stokes type
429 : void _fiddleStokesCoordinate(
430 : casacore::ImageInterface<casacore::Complex>& ie,
431 : casacore::Stokes::StokesTypes type
432 : ) const;
433 :
434 : // Change the time coordinate to be rotation measure
435 : void _fiddleTimeCoordinate(
436 : casacore::ImageInterface<casacore::Complex>& ie,
437 : const casacore::Quantum<casacore::Double>& f, casacore::Int coord
438 : ) const;
439 :
440 : // Find the central frequency from the given spectral coordinate
441 : casacore::Quantum<casacore::Double> _findCentralFrequency(
442 : const casacore::Coordinate& coord, casacore::Int shape
443 : ) const;
444 :
445 : // Fit the spectrum of position angles to find the
446 : // rotation measure via Leahy algorithm
447 : casacore::Bool _findRotationMeasure(
448 : casacore::Float& rmFitted, casacore::Float& rmErrFitted,
449 : casacore::Float& pa0Fitted, casacore::Float& pa0ErrFitted,
450 : casacore::Float& rChiSqFitted, casacore::Float& nTurns,
451 : const casacore::Vector<casacore::uInt>& sortidx,
452 : const casacore::Vector<casacore::Float>& wsq,
453 : const casacore::Vector<casacore::Float>& pa,
454 : const casacore::Array<casacore::Bool>& paMask,
455 : const casacore::Array<casacore::Float>& paerr,
456 : casacore::Float rmfg, casacore::Float rmmax, casacore::Float paErrMax,
457 : const casacore::String& posString
458 : );
459 :
460 : // Find the casacore::Stokes in the construction image and assign pointers
461 : void _findStokes();
462 :
463 : // Find the spectral coordinate.
464 : casacore::Int _findSpectralCoordinate(
465 : const casacore::CoordinateSystem& cSys, casacore::LogIO& os,
466 : casacore::Bool fail
467 : ) const;
468 :
469 : // FInd frequency axis
470 : void _findFrequencyAxis(
471 : casacore::Int& spectralCoord, casacore::Int& fAxis,
472 : const casacore::CoordinateSystem& cSys, casacore::Int spectralAxis
473 : ) const;
474 :
475 : // So we have Q and U ? Excpetion if not
476 : void _hasQU () const;
477 :
478 : // Make a LEN for the give types of polarized intensity
479 : casacore::LatticeExprNode _makePolIntNode(
480 : casacore::LogIO& os, casacore::Bool debias, casacore::Float clip,
481 : casacore::Float sigma, casacore::Bool doLin, casacore::Bool doCirc
482 : );
483 :
484 : // Make an IE for the specified Stokes
485 : casacore::ImageExpr<casacore::Float> _makeStokesExpr(
486 : casacore::ImageInterface<casacore::Float>* imPtr,
487 : casacore::Stokes::StokesTypes type, const casacore::String& name
488 : ) const;
489 :
490 : // Make a casacore::SubImage from the construction image for the specified
491 : // pixel along the specified pixel axis
492 : casacore::ImageInterface<casacore::Float>* _makeSubImage(
493 : casacore::IPosition& blc, casacore::IPosition& trc,
494 : casacore::Int axis, casacore::Int pix
495 : ) const;
496 :
497 : // Least squares fit to find RM from position angles
498 : casacore::Bool _rmLsqFit(
499 : casacore::Vector<casacore::Float>& pars,
500 : const casacore::Vector<casacore::Float>& wsq,
501 : const casacore::Vector<casacore::Float> pa,
502 : const casacore::Vector<casacore::Float>& paerr
503 : ) const;
504 :
505 : // Fit the spectrum of position angles to find the rotation measure
506 : // via Leahy algorithm for primary (n>2) points
507 : casacore::Bool _rmPrimaryFit(
508 : casacore::Float& nTurns, casacore::Float& rmFitted,
509 : casacore::Float& rmErrFitted, casacore::Float& pa0Fitted,
510 : casacore::Float& pa0ErrFitted, casacore::Float& rChiSqFitted,
511 : const casacore::Vector<casacore::Float>& wsq,
512 : const casacore::Vector<casacore::Float>& pa,
513 : const casacore::Vector<casacore::Float>& paerr,
514 : casacore::Float rmmax, const casacore::String& posString
515 : );
516 :
517 : // Fit the spectrum of position angles to find the rotation measure
518 : // via Leahy algorithm for supplementary (n==2) points
519 : casacore::Bool _rmSupplementaryFit(
520 : casacore::Float& nTurns, casacore::Float& rmFitted,
521 : casacore::Float& rmErrFitted, casacore::Float& pa0Fitted,
522 : casacore::Float& pa0ErrFitted, casacore::Float& rChiSqFitted,
523 : const casacore::Vector<casacore::Float>& wsq,
524 : const casacore::Vector<casacore::Float>& pa,
525 : const casacore::Vector<casacore::Float>& paerr
526 : );
527 :
528 : // Return I, Q, U or V for specified integer index (0-3)
529 : casacore::String _stokesName(
530 : ImagePolarimetry::StokesTypes index
531 : ) const;
532 :
533 : // Return I, Q, U or V for specified integer index (0-3)
534 : casacore::Stokes::StokesTypes _stokesType(
535 : ImagePolarimetry::StokesTypes index
536 : ) const;
537 :
538 : // Find the standard deviation for the Stokes image
539 : // specified by the integer index
540 : casacore::Float _sigma(
541 : ImagePolarimetry::StokesTypes index, casacore::Float clip
542 : );
543 :
544 : // Subtract profile mean from image
545 : void _subtractProfileMean(
546 : casacore::ImageInterface<casacore::Float>& im, casacore::uInt axis
547 : ) const;
548 :
549 : void _createBeamsEqMat();
550 :
551 : casacore::Bool _checkBeams(
552 : const std::vector<StokesTypes>& stokes,
553 : casacore::Bool requireChannelEquality, casacore::Bool throws=true
554 : ) const;
555 :
556 : casacore::Bool _checkIQUBeams(
557 : casacore::Bool requireChannelEquality, casacore::Bool throws=true
558 : ) const ;
559 :
560 : casacore::Bool _checkIVBeams(
561 : casacore::Bool requireChannelEquality, casacore::Bool throws=true
562 : ) const;
563 :
564 : casacore::Bool _checkQUBeams(
565 : casacore::Bool requireChannelEquality, casacore::Bool throws=true
566 : ) const;
567 :
568 : static void _checkBeams(
569 : const ImagePolarimetry& im1, const ImagePolarimetry& im2,
570 : const casacore::Vector<StokesTypes>& stokes
571 : );
572 :
573 : void _setInfo(
574 : casacore::ImageInterface<casacore::Complex>& im, StokesTypes stokes
575 : ) const;
576 :
577 : void _setInfo(
578 : casacore::ImageInterface<casacore::Float>& im, StokesTypes stokes
579 : ) const;
580 :
581 : void _setDoLinDoCirc(casacore::Bool& doLin, casacore::Bool& doCirc) const;
582 :
583 : };
584 :
585 : }
586 :
587 : #endif
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