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casacore::ImageRegrid< T > Class Template Reference

This regrids one image to match the coordinate system of another. More...

#include <ImageRegrid.h>

Public Member Functions

 ImageRegrid ()
 Default constructor. More...
 
 ImageRegrid (const ImageRegrid &other)
 copy constructor (copy semantics) More...
 
 ~ImageRegrid ()
 destructor More...
 
ImageRegrid< T > & operator= (const ImageRegrid &other)
 Assignment copy semantics) More...
 
void regrid (ImageInterface< T > &outImage, typename Interpolate2D::Method method, const IPosition &whichOutPixelAxes, const ImageInterface< T > &inImage, Bool replicate=False, uInt decimate=0, Bool showProgress=False, Bool forceRegrid=False, Bool verbose=False)
 Regrid inImage onto the grid specified by outImage. More...
 
void get2DCoordinateGrid (Cube< Double > &grid, Matrix< Bool > &gridMask) const
 Get and set the 2-D coordinate grid. More...
 
void set2DCoordinateGrid (const Cube< Double > &grid, const Matrix< Bool > &gridMask, Bool notify=False)
 
Bool insert (ImageInterface< T > &outImage, const Vector< Double > &outPixelLocation, const ImageInterface< T > &inImage)
 Inserts inImage into outImage. More...
 
void showDebugInfo (Int level=0)
 Print out useful debugging information (level 0 is none, 1 is some, 2 is too much) More...
 
void disableReferenceConversions (Bool disable=True)
 Enable/disable Measures Reference conversions. More...
 

Static Public Member Functions

static CoordinateSystem makeCoordinateSystem (LogIO &os, std::set< Coordinate::Type > &coordsToBeRegridded, const CoordinateSystem &cSysTo, const CoordinateSystem &cSysFrom, const IPosition &axes, const IPosition &inShape=IPosition(), Bool giveStokesWarning=True)
 Helper function. More...
 

Private Member Functions

void _checkAxes (IPosition &outPixelAxes, const IPosition &inShape, const IPosition &outShape, const Vector< Int > &pixelAxisMap, const CoordinateSystem &outCoords, Bool verbose)
 Check shape and axes. More...
 
void findMaps (uInt nDim, Vector< Int > &pixelAxisMap1, Vector< Int > &pixelAxisMap2, const CoordinateSystem &inCoords, const CoordinateSystem &outCoords) const
 Find maps between coordinate systems. More...
 
Double findScaleFactor (const Unit &units, const CoordinateSystem &inCoords, const CoordinateSystem &outCoords, Int inCoordinate, Int outCoordinate, LogIO &os) const
 Find scale factor to conserve flux. More...
 
void _regridOneCoordinate (LogIO &os, IPosition &outShape2, Vector< Bool > &doneOutPixelAxes, MaskedLattice< T > *&finalOutPtr, MaskedLattice< T > *&inPtr, MaskedLattice< T > *&outPtr, CoordinateSystem &outCoords, const CoordinateSystem &inCoords, Int outPixelAxis, const ImageInterface< T > &inImage, const IPosition &outShape, Bool replicate, uInt decimate, Bool outIsMasked, Bool showProgress, Bool forceRegrid, typename Interpolate2D::Method method, Bool verbose)
 Regrid one Coordinate. More...
 
void regridTwoAxisCoordinate (LogIO &os, MaskedLattice< T > &outLattice, const MaskedLattice< T > &inLattice, const Unit &imageUnit, const CoordinateSystem &inCoords, const CoordinateSystem &outCoords, Int inCoordinate, Int outCoordinate, const Vector< Int > inPixelAxes, const Vector< Int > outPixelAxes, const Vector< Int > pixelAxisMap1, const Vector< Int > pixelAxisMap2, typename Interpolate2D::Method method, Bool replicate, uInt decimate, Bool showProgress)
 Regrid DirectionCoordinate or 2-axis LinearCoordinate. More...
 
void make2DCoordinateGrid (LogIO &os, Bool &allFail, Bool &missedIt, Double &minInX, Double &minInY, Double &maxInX, Double &maxInY, Cube< Double > &in2DPos, Matrix< Bool > &succeed, const CoordinateSystem &inCoords, const CoordinateSystem &outCoords, Int inCoordinate, Int outCoordinate, uInt xInAxis, uInt yInAxis, uInt xOutAxis, uInt yOutAxis, const IPosition &inPixelAxes, const IPosition &outPixelAxes, const IPosition &inShape, const IPosition &outPos, const IPosition &cursorShape, uInt decimate=0)
 Make regridding coordinate grid for this cursor. More...
 
void make2DCoordinateGrid (Cube< Double > &in2DPos, Double &minInX, Double &minInY, Double &maxInX, Double &maxInY, const Vector< Double > &pixelScale, uInt xInAxis, uInt yInAxis, uInt xOutAxis, uInt yOutAxis, uInt xInCorrAxis, uInt yInCorrAxis, uInt xOutCorrAxis, uInt yOutCorrAxis, const IPosition &outPos, const IPosition &cursorShape)
 Make replication coordinate grid for this cursor. More...
 
void make1DCoordinateGrid (Block< typename NumericTraits< T >::BaseType > &xOut, Vector< Bool > &failed, Bool &allFailed, Bool &allGood, const Coordinate &inCoord, const Coordinate &outCoord, Int inAxisInCoordinate, Int outAxisInCoordinate, MFrequency::Convert &machine, Bool useMachine)
 Make regridding coordinate grid for this axis. More...
 
void make1DCoordinateGrid (Block< typename NumericTraits< T >::BaseType > &xOut, typename NumericTraits< T >::BaseType pixelScale) const
 Make replication coordinate grid for this axis. More...
 
void regrid1D (MaskedLattice< T > &outLattice, const MaskedLattice< T > &inLattice, const Coordinate &inCoord, const Coordinate &outCoord, const Vector< Int > &inPixelAxes, const Vector< Int > &outPixelAxes, Int inAxisInCoordinate, Int outAxisInCoordinate, const Vector< Int > pixelAxisMap, typename Interpolate2D::Method method, MFrequency::Convert &machine, Bool replicate, Bool useMachine, Bool showProgress)
 Regrid 1 axis. More...
 
void regrid2DMatrix (Lattice< T > &outCursor, LatticeIterator< Bool > *&outMaskIterPtr, const Interpolate2D &interp, ProgressMeter *&pProgress, Double &iPix, uInt nDim, uInt xInAxis, uInt yInAxis, uInt xOutAxis, uInt yOutAxis, Double scale, Bool inIsMasked, Bool outIsMasked, const IPosition &outPos, const IPosition &outCursorShape, const IPosition &inChunkShape, const IPosition &inChunkBlc, const IPosition &pixelAxisMap2, Array< T > &inDataChunk, Array< Bool > *&inMaskChunkPtr, const Cube< Double > &pix2DPos, const Matrix< Bool > &succeed)
 
void findXYExtent (Bool &missedIt, Bool &allFailed, Double &minInX, Double &minInY, Double &maxInX, Double &maxInY, Cube< Double > &in2DPos, const Matrix< Bool > &succeed, uInt xInAxis, uInt yInAxis, uInt xOutAxis, uInt yOutAxis, const IPosition &outPos, const IPosition &outCursorShape, const IPosition &inShape)
 
Bool minmax (Double &minX, Double &maxX, Double &minY, Double &maxY, const Array< Double > &xData, const Array< Double > &yData, const Array< Bool > &mask)
 

Private Attributes

Int itsShowLevel
 
Bool itsDisableConversions
 
Cube< Doubleits2DCoordinateGrid
 
Matrix< Boolits2DCoordinateGridMask
 
Cube< DoubleitsUser2DCoordinateGrid
 
Matrix< BoolitsUser2DCoordinateGridMask
 
Bool itsNotify
 

Detailed Description

template<class T>
class casacore::ImageRegrid< T >

This regrids one image to match the coordinate system of another.

Intended use:

Public interface

Review Status

Date Reviewed:
yyyy/mm/dd

Prerequisite

Etymology

Regrids, or resamples, images.

Synopsis

This class enables you to regrid one image to the coordinate system of another. You can regrid any or all of the axes in the image. A range of interpolation schemes are available.

It will cope with coordinate systems being in different orders (coordinate, world axes, pixel axes). The basic approach is to make a mapping from the input to the output coordinate systems, but the output CoordinateSystem order is preserved in the output image.

Any DirectionCoordinate or LinearCoordinate holding exactly two axes is regridded in one pass with a 2-D interpolation scheme. All other axes are regridded in separate passes with a 1D interpolation scheme. This means that a LinearCoordinate holding say 3 axes where some of them are coupled will not be correctly regridded. StokesCoordinates cannot be regridded.

Multiple passes are made through the data, and the output of each pass is the input of the next pass. The intermediate images are stored as TempImages which may be in memory or on disk, depending on their size.

It can also simply insert this image into that one via an integer shift.

Example

Motivation

A common image analysis need is to regrid images, e.g. to compare images from different telescopes.

Thrown Exceptions

Definition at line 120 of file ImageRegrid.h.

Constructor & Destructor Documentation

template<class T>
casacore::ImageRegrid< T >::ImageRegrid ( )

Default constructor.

template<class T>
casacore::ImageRegrid< T >::ImageRegrid ( const ImageRegrid< T > &  other)

copy constructor (copy semantics)

template<class T>
casacore::ImageRegrid< T >::~ImageRegrid ( )

destructor

Member Function Documentation

template<class T>
void casacore::ImageRegrid< T >::_checkAxes ( IPosition outPixelAxes,
const IPosition inShape,
const IPosition outShape,
const Vector< Int > &  pixelAxisMap,
const CoordinateSystem outCoords,
Bool  verbose 
)
private

Check shape and axes.

Exception if no good. If pixelAxes of length 0, set to all axes according to shape

template<class T>
void casacore::ImageRegrid< T >::_regridOneCoordinate ( LogIO os,
IPosition outShape2,
Vector< Bool > &  doneOutPixelAxes,
MaskedLattice< T > *&  finalOutPtr,
MaskedLattice< T > *&  inPtr,
MaskedLattice< T > *&  outPtr,
CoordinateSystem outCoords,
const CoordinateSystem inCoords,
Int  outPixelAxis,
const ImageInterface< T > &  inImage,
const IPosition outShape,
Bool  replicate,
uInt  decimate,
Bool  outIsMasked,
Bool  showProgress,
Bool  forceRegrid,
typename Interpolate2D::Method  method,
Bool  verbose 
)
private

Regrid one Coordinate.

template<class T>
void casacore::ImageRegrid< T >::disableReferenceConversions ( Bool  disable = True)
inline

Enable/disable Measures Reference conversions.

Definition at line 190 of file ImageRegrid.h.

References casacore::ImageRegrid< T >::itsDisableConversions.

template<class T>
void casacore::ImageRegrid< T >::findMaps ( uInt  nDim,
Vector< Int > &  pixelAxisMap1,
Vector< Int > &  pixelAxisMap2,
const CoordinateSystem inCoords,
const CoordinateSystem outCoords 
) const
private

Find maps between coordinate systems.

template<class T>
Double casacore::ImageRegrid< T >::findScaleFactor ( const Unit units,
const CoordinateSystem inCoords,
const CoordinateSystem outCoords,
Int  inCoordinate,
Int  outCoordinate,
LogIO os 
) const
private

Find scale factor to conserve flux.

template<class T>
void casacore::ImageRegrid< T >::findXYExtent ( Bool missedIt,
Bool allFailed,
Double minInX,
Double minInY,
Double maxInX,
Double maxInY,
Cube< Double > &  in2DPos,
const Matrix< Bool > &  succeed,
uInt  xInAxis,
uInt  yInAxis,
uInt  xOutAxis,
uInt  yOutAxis,
const IPosition outPos,
const IPosition outCursorShape,
const IPosition inShape 
)
private
template<class T>
void casacore::ImageRegrid< T >::get2DCoordinateGrid ( Cube< Double > &  grid,
Matrix< Bool > &  gridMask 
) const

Get and set the 2-D coordinate grid.

After a call to function regrid in which coupled 2D coordinate (presently only DirectionCoordinate) is regridded, this coordinate grid will be available. It can be reused via the set2DCoordinateGrid function for another like plane (e.g. if you choose to regrid planes of a cube separately). When you provide the coordinate grid, it will no longer (for that 2D coordinate only) be computed internally, which may save a lot of time. Ordinarily, if you regridded many planes of a cube in one call to regrid, the coordinate grid is cached for you. To trigger successive calls to regrid to go back to internal computation, set zero length Cube and Matrix. gridMask is True for successfull coordinate conversions, and False otherwise.

template<class T>
Bool casacore::ImageRegrid< T >::insert ( ImageInterface< T > &  outImage,
const Vector< Double > &  outPixelLocation,
const ImageInterface< T > &  inImage 
)

Inserts inImage into outImage.

The alignment is done by placing the blc of inImage at the specified absolute pixel of the outImage (outPixelLocation). If the outPixelLocation vector is of zero length, then the images are aligned by their reference pixels. Only integral shifts are done in the aligment process. If outImage has a mask, it will be updated. Returns False if no overlap of images, in which case the output is not updated.

template<class T>
void casacore::ImageRegrid< T >::make1DCoordinateGrid ( Block< typename NumericTraits< T >::BaseType > &  xOut,
Vector< Bool > &  failed,
Bool allFailed,
Bool allGood,
const Coordinate inCoord,
const Coordinate outCoord,
Int  inAxisInCoordinate,
Int  outAxisInCoordinate,
MFrequency::Convert machine,
Bool  useMachine 
)
private

Make regridding coordinate grid for this axis.

template<class T>
void casacore::ImageRegrid< T >::make1DCoordinateGrid ( Block< typename NumericTraits< T >::BaseType > &  xOut,
typename NumericTraits< T >::BaseType  pixelScale 
) const
private

Make replication coordinate grid for this axis.

template<class T>
void casacore::ImageRegrid< T >::make2DCoordinateGrid ( LogIO os,
Bool allFail,
Bool missedIt,
Double minInX,
Double minInY,
Double maxInX,
Double maxInY,
Cube< Double > &  in2DPos,
Matrix< Bool > &  succeed,
const CoordinateSystem inCoords,
const CoordinateSystem outCoords,
Int  inCoordinate,
Int  outCoordinate,
uInt  xInAxis,
uInt  yInAxis,
uInt  xOutAxis,
uInt  yOutAxis,
const IPosition inPixelAxes,
const IPosition outPixelAxes,
const IPosition inShape,
const IPosition outPos,
const IPosition cursorShape,
uInt  decimate = 0 
)
private

Make regridding coordinate grid for this cursor.

template<class T>
void casacore::ImageRegrid< T >::make2DCoordinateGrid ( Cube< Double > &  in2DPos,
Double minInX,
Double minInY,
Double maxInX,
Double maxInY,
const Vector< Double > &  pixelScale,
uInt  xInAxis,
uInt  yInAxis,
uInt  xOutAxis,
uInt  yOutAxis,
uInt  xInCorrAxis,
uInt  yInCorrAxis,
uInt  xOutCorrAxis,
uInt  yOutCorrAxis,
const IPosition outPos,
const IPosition cursorShape 
)
private

Make replication coordinate grid for this cursor.

template<class T>
static CoordinateSystem casacore::ImageRegrid< T >::makeCoordinateSystem ( LogIO os,
std::set< Coordinate::Type > &  coordsToBeRegridded,
const CoordinateSystem cSysTo,
const CoordinateSystem cSysFrom,
const IPosition axes,
const IPosition inShape = IPosition(),
Bool  giveStokesWarning = True 
)
static

Helper function.

We are regridding from cSysFrom to cSysTo for the specified pixel axes of cSyFrom. This function returns a CoordinateSystem which, for the pixel axes being regridded, copies the coordinates from cSysTo (if coordinate type present in cSysTo) or cSysFrom (coordinate type not present in cSysTo). For the axes not being regridded, it copies the coordinates from cSysFrom. This helps you build the cSys for function regrid. The ObsInfo from cSysFrom is copied to the output CoordinateSystem. If inShape has one or more elements it represenents the size of the image to be regridded. It this must have the same number of elements as the number of pixel axes in cSysFrom. If any of the values are unity (ie the axes are degenerate), and the corresponding axis in csysFrom is the only axis in its corresponding coordinate, this coordinate will not be replaced even if the axis is specified in axes. Upon return, coordsToBeRegridded will contain a list of the coordinates that will be regridded.

template<class T>
Bool casacore::ImageRegrid< T >::minmax ( Double minX,
Double maxX,
Double minY,
Double maxY,
const Array< Double > &  xData,
const Array< Double > &  yData,
const Array< Bool > &  mask 
)
private
template<class T>
ImageRegrid<T>& casacore::ImageRegrid< T >::operator= ( const ImageRegrid< T > &  other)

Assignment copy semantics)

template<class T>
void casacore::ImageRegrid< T >::regrid ( ImageInterface< T > &  outImage,
typename Interpolate2D::Method  method,
const IPosition whichOutPixelAxes,
const ImageInterface< T > &  inImage,
Bool  replicate = False,
uInt  decimate = 0,
Bool  showProgress = False,
Bool  forceRegrid = False,
Bool  verbose = False 
)

Regrid inImage onto the grid specified by outImage.

If outImage has a writable mask, it will be updated in that output pixels at which the regridding failed will be masked bad (False) and the pixel value set to zero. Otherwise the output mask is not changed. Specify which pixel axes of outImage are to be regridded. The coordinate and axis order of outImage is preserved, regardless of where the relevant coordinates are in inImage.

decimate only applies when replicate=False. it is the coordinate grid computation decimation FACTOR (e.g. nCoordGrid ~ nIn / decimate). 0 means no decimation (slowest and most accurate)

template<class T>
void casacore::ImageRegrid< T >::regrid1D ( MaskedLattice< T > &  outLattice,
const MaskedLattice< T > &  inLattice,
const Coordinate inCoord,
const Coordinate outCoord,
const Vector< Int > &  inPixelAxes,
const Vector< Int > &  outPixelAxes,
Int  inAxisInCoordinate,
Int  outAxisInCoordinate,
const Vector< Int pixelAxisMap,
typename Interpolate2D::Method  method,
MFrequency::Convert machine,
Bool  replicate,
Bool  useMachine,
Bool  showProgress 
)
private

Regrid 1 axis.

template<class T>
void casacore::ImageRegrid< T >::regrid2DMatrix ( Lattice< T > &  outCursor,
LatticeIterator< Bool > *&  outMaskIterPtr,
const Interpolate2D interp,
ProgressMeter *&  pProgress,
Double iPix,
uInt  nDim,
uInt  xInAxis,
uInt  yInAxis,
uInt  xOutAxis,
uInt  yOutAxis,
Double  scale,
Bool  inIsMasked,
Bool  outIsMasked,
const IPosition outPos,
const IPosition outCursorShape,
const IPosition inChunkShape,
const IPosition inChunkBlc,
const IPosition pixelAxisMap2,
Array< T > &  inDataChunk,
Array< Bool > *&  inMaskChunkPtr,
const Cube< Double > &  pix2DPos,
const Matrix< Bool > &  succeed 
)
private
template<class T>
void casacore::ImageRegrid< T >::regridTwoAxisCoordinate ( LogIO os,
MaskedLattice< T > &  outLattice,
const MaskedLattice< T > &  inLattice,
const Unit imageUnit,
const CoordinateSystem inCoords,
const CoordinateSystem outCoords,
Int  inCoordinate,
Int  outCoordinate,
const Vector< Int inPixelAxes,
const Vector< Int outPixelAxes,
const Vector< Int pixelAxisMap1,
const Vector< Int pixelAxisMap2,
typename Interpolate2D::Method  method,
Bool  replicate,
uInt  decimate,
Bool  showProgress 
)
private
template<class T>
void casacore::ImageRegrid< T >::set2DCoordinateGrid ( const Cube< Double > &  grid,
const Matrix< Bool > &  gridMask,
Bool  notify = False 
)
template<class T>
void casacore::ImageRegrid< T >::showDebugInfo ( Int  level = 0)
inline

Print out useful debugging information (level 0 is none, 1 is some, 2 is too much)

Definition at line 187 of file ImageRegrid.h.

References casacore::ImageRegrid< T >::itsShowLevel.

Member Data Documentation

template<class T>
Cube<Double> casacore::ImageRegrid< T >::its2DCoordinateGrid
private

Definition at line 223 of file ImageRegrid.h.

template<class T>
Matrix<Bool> casacore::ImageRegrid< T >::its2DCoordinateGridMask
private

Definition at line 224 of file ImageRegrid.h.

template<class T>
Bool casacore::ImageRegrid< T >::itsDisableConversions
private
template<class T>
Bool casacore::ImageRegrid< T >::itsNotify
private

Definition at line 228 of file ImageRegrid.h.

template<class T>
Int casacore::ImageRegrid< T >::itsShowLevel
private

Definition at line 220 of file ImageRegrid.h.

Referenced by casacore::ImageRegrid< T >::showDebugInfo().

template<class T>
Cube<Double> casacore::ImageRegrid< T >::itsUser2DCoordinateGrid
private

Definition at line 226 of file ImageRegrid.h.

template<class T>
Matrix<Bool> casacore::ImageRegrid< T >::itsUser2DCoordinateGridMask
private

Definition at line 227 of file ImageRegrid.h.


The documentation for this class was generated from the following file: