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< Double >	its2DCoordinateGrid
Matrix< Bool >	its2DCoordinateGridMask
Cube< Double >	itsUser2DCoordinateGrid
Matrix< Bool >	itsUser2DCoordinateGridMask
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

• ImageInterface
• CoordinateSystem
• Interpolate2D
• InterpolateArray1D

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

• AipsError

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

Regrid DirectionCoordinate or 2-axis LinearCoordinate.

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

Definition at line 221 of file ImageRegrid.h.

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

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.

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

• casa/casacore/images/Images/ImageRegrid.h