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casacore::FITSMask Class Reference

Provides an on-the-fly mask for FITS images. More...

#include <FITSMask.h>

Inheritance diagram for casacore::FITSMask:
casacore::Lattice< Bool > casacore::LatticeBase

Public Member Functions

 FITSMask (TiledFileAccess *tiledFileAccess)
 Constructor (for 32 bit floating point). More...
 
 FITSMask (TiledFileAccess *tiledFileAccess, Float scale, Float offset, uChar magic, Bool hasBlanks)
 Constructor (for 8 bit integers). More...
 
 FITSMask (TiledFileAccess *tiledFileAccess, Float scale, Float offset, Short magic, Bool hasBlanks)
 Constructor (for 16 bit integers). More...
 
 FITSMask (TiledFileAccess *tiledFileAccess, Float scale, Float offset, Int magic, Bool hasBlanks)
 Constructor (for 32 bit integers). More...
 
 FITSMask (const FITSMask &other)
 Copy constructor (reference semantics). More...
 
virtual ~FITSMask ()
 Destructor. More...
 
FITSMaskoperator= (const FITSMask &other)
 The assignment operator with reference semantics. More...
 
virtual Lattice< Bool > * clone () const
 Make a copy of the object (reference semantics). More...
 
virtual Bool isWritable () const
 Is the FITSMask writable? Returns False. More...
 
IPosition shape () const
 Return the shape of the Lattice including all degenerate axes (ie. More...
 
virtual Bool doGetSlice (Array< Bool > &buffer, const Slicer &section)
 Do the actual getting of an array of values. More...
 
virtual void doPutSlice (const Array< Bool > &sourceBuffer, const IPosition &where, const IPosition &stride)
 Do the actual getting of an array of values. More...
 
virtual void setFilterZero (Bool filterZero)
 Set the switch for also filtering 0.0 (besides NaNs). More...
 
- Public Member Functions inherited from casacore::Lattice< Bool >
virtual ~Lattice ()
 a virtual destructor is needed so that it will use the actual destructor in the derived class More...
 
virtual DataType dataType () const
 Get the data type of the lattice. More...
 
Bool operator() (const IPosition &where) const
 Return the value of the single element located at the argument IPosition. More...
 
virtual Bool getAt (const IPosition &where) const
 
virtual void putAt (const Bool &value, const IPosition &where)
 Put the value of a single element. More...
 
Bool get (COWPtr< Array< Bool > > &buffer, Bool removeDegenerateAxes=False) const
 Functions which extract an Array of values from a Lattice. More...
 
Bool get (Array< Bool > &buffer, Bool removeDegenerateAxes=False)
 
Array< Boolget (Bool removeDegenerateAxes=False) const
 
Bool getSlice (COWPtr< Array< Bool > > &buffer, const Slicer &section, Bool removeDegenerateAxes=False) const
 
Bool getSlice (COWPtr< Array< Bool > > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const
 
Bool getSlice (COWPtr< Array< Bool > > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const
 
Bool getSlice (Array< Bool > &buffer, const Slicer &section, Bool removeDegenerateAxes=False)
 
Bool getSlice (Array< Bool > &buffer, const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False)
 
Bool getSlice (Array< Bool > &buffer, const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False)
 
Array< BoolgetSlice (const Slicer &section, Bool removeDegenerateAxes=False) const
 
Array< BoolgetSlice (const IPosition &start, const IPosition &shape, Bool removeDegenerateAxes=False) const
 
Array< BoolgetSlice (const IPosition &start, const IPosition &shape, const IPosition &stride, Bool removeDegenerateAxes=False) const
 
void putSlice (const Array< Bool > &sourceBuffer, const IPosition &where, const IPosition &stride)
 A function which places an Array of values within this instance of the Lattice at the location specified by the IPosition "where", incrementing by "stride". More...
 
void putSlice (const Array< Bool > &sourceBuffer, const IPosition &where)
 
void put (const Array< Bool > &sourceBuffer)
 
virtual void set (const Bool &value)
 Set all elements in the Lattice to the given value. More...
 
virtual void apply (Bool(*function)(Bool))
 Replace every element, x, of the Lattice with the result of f(x). More...
 
virtual void apply (Bool(*function)(const Bool &))
 
virtual void apply (const Functional< Bool, Bool > &function)
 
void operator+= (const Lattice< Bool > &other)
 Add, subtract, multiple, or divide by another Lattice. More...
 
void operator-= (const Lattice< Bool > &other)
 
void operator*= (const Lattice< Bool > &other)
 
void operator/= (const Lattice< Bool > &other)
 
virtual void copyData (const Lattice< Bool > &from)
 Copy the data from the given lattice to this one. More...
 
virtual void copyDataTo (Lattice< Bool > &to) const
 Copy the data from this lattice to the given lattice. More...
 
virtual uInt advisedMaxPixels () const
 This function returns the advised maximum number of pixels to include in the cursor of an iterator. More...
 
virtual LatticeIterInterface
< Bool > * 
makeIter (const LatticeNavigator &navigator, Bool useRef) const
 These functions are used by the LatticeIterator class to generate an iterator of the correct type for a specified Lattice. More...
 
- Public Member Functions inherited from casacore::LatticeBase
virtual ~LatticeBase ()
 A virtual destructor is needed so that it will use the actual destructor in the derived class. More...
 
virtual String imageType () const
 Get the image type (returns name of derived class). More...
 
virtual Bool isPersistent () const
 Is the lattice persistent and can it be loaded by other processes as well? That is the case for a PagedArray or PagedImage and for an ImageExpr which does not use transient lattices or regions. More...
 
virtual Bool isPaged () const
 Is the lattice paged to disk?
The default implementation returns False. More...
 
virtual Bool canReferenceArray () const
 Can the lattice data be referenced as an array section? That is the case for an ArrayLattice or a Temp/SubLattice using it. More...
 
virtual void save (const String &fileName) const
 Save the image in an AipsIO file with the given name. More...
 
virtual Bool lock (FileLocker::LockType, uInt nattempts)
 It is strongly recommended to use class LatticeLocker to handle lattice locking. More...
 
virtual void unlock ()
 
virtual Bool hasLock (FileLocker::LockType) const
 
virtual void resync ()
 Resynchronize the Lattice object with the lattice file. More...
 
virtual void flush ()
 Flush the data (but do not unlock). More...
 
virtual void tempClose ()
 Temporarily close the lattice. More...
 
virtual void reopen ()
 Explicitly reopen the temporarily closed lattice. More...
 
virtual String name (Bool stripPath=False) const
 Return the name of the current Lattice object. More...
 
virtual uInt ndim () const
 Return the number of axes in this Lattice. More...
 
virtual size_t nelements () const
 Return the total number of elements in this Lattice. More...
 
size_t size () const
 
Bool conform (const LatticeBase &other) const
 Return a value of "True" if this instance of Lattice and 'other' have the same shape, otherwise returns a value of "False". More...
 
virtual LELCoordinates lelCoordinates () const
 Return the coordinates of the lattice. More...
 
IPosition niceCursorShape (uInt maxPixels) const
 Returns a recommended cursor shape for iterating through all the pixels in the Lattice. More...
 
IPosition niceCursorShape () const
 
virtual Bool ok () const
 Check class internals - used for debugging. More...
 
virtual IPosition doNiceCursorShape (uInt maxPixels) const
 The function (in the derived classes) doing the actual work. More...
 
virtual uInt maximumCacheSize () const
 Maximum cache size - not necessarily all used. More...
 
virtual void setMaximumCacheSize (uInt howManyPixels)
 Set the maximum (allowed) cache size as indicated. More...
 
virtual void setCacheSizeInTiles (uInt howManyTiles)
 Set the actual cache size for this Array to be big enough for the indicated number of tiles. More...
 
virtual void setCacheSizeFromPath (const IPosition &sliceShape, const IPosition &windowStart, const IPosition &windowLength, const IPosition &axisPath)
 Set the cache size as to "fit" the indicated path. More...
 
virtual void clearCache ()
 Clears and frees up the caches, but the maximum allowed cache size is unchanged from when setCacheSize was called. More...
 
virtual void showCacheStatistics (ostream &os) const
 Report on cache success. More...
 

Private Member Functions

void filterNaN (Bool *pMask, const float *pData, uInt nelems)
 Mask out ONLY NaN's. More...
 
void filterZeroNaN (Bool *pMask, const Float *pData, uInt nelems)
 Mask out NaN's and values 0.0. More...
 

Private Attributes

TiledFileAccessitsTiledFilePtr
 
Array< FloatitsBuffer
 
Float itsScale
 
Float itsOffset
 
Short itsUCharMagic
 
Short itsShortMagic
 
Int itsLongMagic
 
Bool itsHasIntBlanks
 
Bool itsFilterZero
 

Additional Inherited Members

- Protected Member Functions inherited from casacore::Lattice< Bool >
 Lattice ()
 Define default constructor to satisfy compiler. More...
 
 Lattice (const Lattice< Bool > &)
 Copy constructor and assignment can only be used by derived classes. More...
 
virtual void handleMath (const Lattice< Bool > &from, int oper)
 Handle the Math operators (+=, -=, *=, /=). More...
 
virtual void handleMathTo (Lattice< Bool > &to, int oper) const
 
Lattice< Bool > & operator= (const Lattice< Bool > &)
 
- Protected Member Functions inherited from casacore::LatticeBase
 LatticeBase ()
 Define default constructor to be used by derived classes. More...
 
 LatticeBase (const LatticeBase &)
 Copy constructor and assignment can only be used by derived classes. More...
 
LatticeBaseoperator= (const LatticeBase &)
 
void throwBoolMath () const
 Throw an exception for arithmetic on a Bool Lattice. More...
 

Detailed Description

Provides an on-the-fly mask for FITS images.

Intended use:

Public interface

Prerequisite

Etymology

This class provides a pixel mask for the FITSImage class.

Synopsis

Masked values are indicated in FITS images via magic value blanking. This class provides an on-the-fly mask. The doGetSlice function reads the data values and returns an Array<Bool> which is True (good) or False (bad - blanked)

Because FITSMask inherits from Lattice<Bool> it can be used as the private pixel mask data member for FITSImage returned by the MaskedLattice::pixelMask() functions

The FITSMask object is constructed from a TiledFileAccess object. This must be the same one that the FITSImage object constructs internally. It is shared by both FITSImage and FITSMask.

Example

Motivation

FITSImage provides native access to FITS image files and needede an efficient way to handle the pixel mask other than iterating all the way through the image first to set a mask.

Definition at line 97 of file FITSMask.h.

Constructor & Destructor Documentation

casacore::FITSMask::FITSMask ( TiledFileAccess tiledFileAccess)

Constructor (for 32 bit floating point).

The pointer is not cloned, just copied.

casacore::FITSMask::FITSMask ( TiledFileAccess tiledFileAccess,
Float  scale,
Float  offset,
uChar  magic,
Bool  hasBlanks 
)

Constructor (for 8 bit integers).

The pointer is not cloned, just copied The scale, offset, magic blanking values must come from the FITS header ('bscale', 'bzero', 'blank')

casacore::FITSMask::FITSMask ( TiledFileAccess tiledFileAccess,
Float  scale,
Float  offset,
Short  magic,
Bool  hasBlanks 
)

Constructor (for 16 bit integers).

The pointer is not cloned, just copied The scale, offset, magic blanking values must come from the FITS header ('bscale', 'bzero', 'blank')

casacore::FITSMask::FITSMask ( TiledFileAccess tiledFileAccess,
Float  scale,
Float  offset,
Int  magic,
Bool  hasBlanks 
)

Constructor (for 32 bit integers).

The pointer is not cloned, just copied The scale, offset, magic blanking values must come from the FITS header ('bscale', 'bzero', 'blank')

casacore::FITSMask::FITSMask ( const FITSMask other)

Copy constructor (reference semantics).

The TiledFileAccess pointer is just copied.

virtual casacore::FITSMask::~FITSMask ( )
virtual

Destructor.

Member Function Documentation

virtual Lattice<Bool>* casacore::FITSMask::clone ( ) const
virtual

Make a copy of the object (reference semantics).

Implements casacore::Lattice< Bool >.

virtual Bool casacore::FITSMask::doGetSlice ( Array< Bool > &  buffer,
const Slicer section 
)
virtual

Do the actual getting of an array of values.

Implements casacore::Lattice< Bool >.

virtual void casacore::FITSMask::doPutSlice ( const Array< Bool > &  sourceBuffer,
const IPosition where,
const IPosition stride 
)
virtual

Do the actual getting of an array of values.

Throws an exception.

Implements casacore::Lattice< Bool >.

void casacore::FITSMask::filterNaN ( Bool pMask,
const float *  pData,
uInt  nelems 
)
private

Mask out ONLY NaN's.

void casacore::FITSMask::filterZeroNaN ( Bool pMask,
const Float pData,
uInt  nelems 
)
private

Mask out NaN's and values 0.0.

virtual Bool casacore::FITSMask::isWritable ( ) const
virtual

Is the FITSMask writable? Returns False.

Although it is not hard to implement writing of the mask, data values would be lost because of magic blanking.

Reimplemented from casacore::LatticeBase.

FITSMask& casacore::FITSMask::operator= ( const FITSMask other)

The assignment operator with reference semantics.

The TiledFileAccess pointer is just copied.

virtual void casacore::FITSMask::setFilterZero ( Bool  filterZero)
virtual

Set the switch for also filtering 0.0 (besides NaNs).

IPosition casacore::FITSMask::shape ( ) const
virtual

Return the shape of the Lattice including all degenerate axes (ie.

axes with a length of one)

Implements casacore::LatticeBase.

Member Data Documentation

Array<Float> casacore::FITSMask::itsBuffer
private

Definition at line 167 of file FITSMask.h.

Bool casacore::FITSMask::itsFilterZero
private

Definition at line 173 of file FITSMask.h.

Bool casacore::FITSMask::itsHasIntBlanks
private

Definition at line 172 of file FITSMask.h.

Int casacore::FITSMask::itsLongMagic
private

Definition at line 171 of file FITSMask.h.

Float casacore::FITSMask::itsOffset
private

Definition at line 168 of file FITSMask.h.

Float casacore::FITSMask::itsScale
private

Definition at line 168 of file FITSMask.h.

Short casacore::FITSMask::itsShortMagic
private

Definition at line 170 of file FITSMask.h.

TiledFileAccess* casacore::FITSMask::itsTiledFilePtr
private

Definition at line 166 of file FITSMask.h.

Short casacore::FITSMask::itsUCharMagic
private

Definition at line 169 of file FITSMask.h.


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