A class for managing data set metadata. More...

#include <Compressor.h>

Inheritance diagram for VAPoR::Compressor:

Public Member Functions
	Compressor (std::vector< size_t > dims, const string &wname, const string &mode)

	Compressor (std::vector< size_t > dims, const string &wname)

	~Compressor ()

int	Compress (const float src_arr, float dst_arr, size_t dst_arr_len, SignificanceMap *sigmap)

int	Compress (const double src_arr, double dst_arr, size_t dst_arr_len, SignificanceMap *sigmap)

int	Decompress (const float src_arr, float dst_arr, SignificanceMap *sigmap)

int	Decompress (const double src_arr, double dst_arr, SignificanceMap *sigmap)

int	Decompose (const float src_arr, float dst_arr, const vector< size_t > &dst_arr_lens, vector< SignificanceMap > &sigmaps)

int	Decompose (const double src_arr, double dst_arr, const vector< size_t > &dst_arr_lens, vector< SignificanceMap > &sigmaps)

int	Reconstruct (const float src_arr, float dst_arr, vector< SignificanceMap > &sigmaps, int l)

int	Reconstruct (const double src_arr, double dst_arr, vector< SignificanceMap > &sigmaps, int l)

void	GetSigMapShape (std::vector< size_t > &dims) const

size_t	GetNumWaveCoeffs () const

size_t	GetSigMapSize (size_t num_entries) const

void	GetDimension (vector< size_t > &dims, int l) const

int	GetNumLevels () const

size_t	GetMinCompression () const

bool &	KeepAppOnOff ()

bool &	ClampMinOnOff ()

double &	ClampMin ()

bool &	ClampMaxOnOff ()

double &	ClampMax ()

bool &	EpsilonOnOff ()

double &	Epsilon ()

Public Member Functions inherited from VAPoR::MatWaveWavedec
	MatWaveWavedec (const string &wname, const string &mode)

	MatWaveWavedec (const string &wname)

virtual	~MatWaveWavedec ()

int	wavedec (const double sigIn, size_t sigInLength, int n, double C, size_t *L)

int	wavedec (const float sigIn, size_t sigInLength, int n, float C, size_t *L)

int	waverec (const double C, const size_t L, int n, double *sigOut)

int	waverec (const float C, const size_t L, int n, float *sigOut)

int	wavedec2 (const double sigIn, size_t sigInX, size_t sigInY, int n, double C, size_t *L)

int	wavedec2 (const float sigIn, size_t sigInX, size_t sigInY, int n, float C, size_t *L)

int	waverec2 (const double C, const size_t L, int n, double *sigOut)

int	waverec2 (const float C, const size_t L, int n, float *sigOut)

int	wavedec3 (const double sigIn, size_t sigInX, size_t sigInY, size_t sigInZ, int n, double C, size_t *L)

int	wavedec3 (const float sigIn, size_t sigInX, size_t sigInY, size_t sigInZ, int n, float C, size_t *L)

int	waverec3 (const double C, const size_t L, int n, double *sigOut)

int	waverec3 (const float C, const size_t L, int n, float *sigOut)

int	appcoef (const double C, const size_t L, int n, int l, bool normal, double *sigOut)

int	appcoef (const float C, const size_t L, int n, int l, bool normal, float *sigOut)

int	appcoef2 (const double C, const size_t L, int n, int l, bool normal, double *sigOut)

int	appcoef2 (const float C, const size_t L, int n, int l, bool normal, float *sigOut)

int	appcoef3 (const double C, const size_t L, int n, int l, bool normal, double *sigOut)

int	appcoef3 (const float C, const size_t L, int n, int l, bool normal, float *sigOut)

size_t	coefflength (size_t sigInLen, int n) const

size_t	coefflength (const size_t *L, int n) const

size_t	approxlength (size_t sigInLen, int n) const

void	approxlength (const size_t L, int n, int l, size_t len) const

size_t	coefflength2 (size_t sigInX, size_t sigInY, int n) const

size_t	coefflength2 (const size_t *L, int n) const

void	approxlength2 (const size_t L, int n, int l, size_t lenx, size_t *leny) const

size_t	coefflength3 (size_t sigInX, size_t sigInY, size_t sigInZ, int n) const

size_t	coefflength3 (const size_t *L, int n) const

void	approxlength3 (const size_t L, int n, int l, size_t lenx, size_t leny, size_t lenz) const

void	computeL (size_t sigInLen, int n, size_t *L) const

void	computeL2 (size_t sigInX, size_t sigInY, int n, size_t *L) const

void	computeL3 (size_t sigInX, size_t sigInY, size_t sigInZ, int n, size_t *L) const

Public Member Functions inherited from VAPoR::MatWaveDwt
	MatWaveDwt (const string &wname, const string &mode)

	MatWaveDwt (const string &wname)

virtual	~MatWaveDwt ()

int	dwt (const double sigIn, size_t sigInLength, double C, size_t L[3])

int	dwt (const float sigIn, size_t sigInLength, float C, size_t L[3])

int	dwt (const double sigIn, size_t sigInLength, double cA, double *cD, size_t L[3])

int	dwt (const float sigIn, size_t sigInLength, float cA, float *cD, size_t L[3])

int	idwt (const double C, const size_t L[3], double sigOut)

int	idwt (const float C, const size_t L[3], float sigOut)

int	idwt (const double cA, const double cD, const size_t L[3], double *sigOut)

int	idwt (const float cA, const float cD, const size_t L[3], float *sigOut)

int	dwt2d (const double sigIn, size_t sigInX, size_t sigInY, double C, size_t L[10])

int	dwt2d (const float sigIn, size_t sigInX, size_t sigInY, float C, size_t L[10])

int	dwt2d (const double sigIn, size_t sigInX, size_t sigInY, double cA, double cDh, double cDv, double *cDd, size_t L[10])

int	dwt2d (const float sigIn, size_t sigInX, size_t sigInY, float cA, float cDh, float cDv, float *cDd, size_t L[10])

int	idwt2d (const double C, const size_t L[10], double sigOut)

int	idwt2d (const float C, const size_t L[10], float sigOut)

int	idwt2d (const double cA, const double cDh, const double cDv, const double cDd, const size_t L[10], double *sigOut)

int	idwt2d (const float cA, const float cDh, const float cDv, const float cDd, const size_t L[10], float *sigOut)

int	dwt3d (const double sigIn, size_t sigInX, size_t sigInY, size_t sigInZ, double C, size_t L[27])

int	dwt3d (const float sigIn, size_t sigInX, size_t sigInY, size_t sigInZ, float C, size_t L[27])

int	idwt3d (const double C, const size_t L[27], double sigOut)
	Single-level inverse discrete 3D wavelet transform. More...

int	idwt3d (const float C, const size_t L[27], float sigOut)

int	idwt3d (const double cLLL, const double cLLH, const double cLHL, const double cLHH, const double cHLL, const double cHLH, const double cHHL, const double cHHH, const size_t L[27], double *sigOut)

int	idwt3d (const float cLLL, const float cLLH, const float cLHL, const float cLHH, const float cHLL, const float cHLH, const float cHHL, const float cHHH, const size_t L[27], float *sigOut)

Public Member Functions inherited from VAPoR::MatWaveBase
	MatWaveBase (const string &wname, const string &mode)

	MatWaveBase (const string &wname)

virtual	~MatWaveBase ()

int	dwtmode (const string &mode)

int	dwtmode (dwtmode_t mode)

const string	dwtmode () const

dwtmode_t	dwtmodeenum () const

int	wavelet (const string &wname)

string	wavelet_name () const

const WaveFiltBase *	wavelet () const

size_t	approxlength (size_t sigInLen) const

size_t	detaillength (size_t sigInLen) const

size_t	coefflength (size_t sigInLen) const

size_t	coefflength2 (size_t sigInX, size_t sigInY) const

size_t	coefflength3 (size_t sigInX, size_t sigInY, size_t sigInZ) const

size_t	wmaxlev (size_t s) const

bool &	InvalidFloatAbortOnOff ()

Public Member Functions inherited from VetsUtil::MyBase
	MyBase ()

const string &	getClassName () const

Static Public Member Functions
static bool	CompressionInfo (vector< size_t > dims, const string wavename, bool keepapp, size_t &nlevels, size_t &maxcratio)

Static Public Member Functions inherited from VetsUtil::MyBase
static void	SetErrMsg (const char *format,...)
	Record a formatted error message. More...

static void	SetErrMsg (int errcode, const char *format,...)
	Record a formatted error message and an error code. More...

static const char *	GetErrMsg ()

static void	SetErrCode (int err_code)
	Record an error code. More...

static int	GetErrCode ()
	Retrieve the current error code. More...

static void	SetErrMsgCB (ErrMsgCB_T cb)

static ErrMsgCB_T	GetErrMsgCB ()

static void	SetErrMsgFilePtr (FILE *fp)

static const FILE *	SetErrMsgFilePtr ()

static void	SetDiagMsg (const char *format,...)
	Record a formatted diagnostic message. More...

static const char *	GetDiagMsg ()

static void	SetDiagMsgCB (DiagMsgCB_T cb)

static DiagMsgCB_T	GetDiagMsgCB ()

static void	SetDiagMsgFilePtr (FILE *fp)

static bool	EnableErrMsg (bool enable)

Friends
std::ostream &	operator<< (std::ostream &o, const Compressor &rhs)

Additional Inherited Members
Public Types inherited from VAPoR::MatWaveBase
enum	dwtmode_t { INVALID = -1, ZPD, SYMH, SYMW, ASYMH, ASYMW, SP0, SP1, PPD, PER }

Public Types inherited from VetsUtil::MyBase
typedef void(*	ErrMsgCB_T )(const char *msg, int err_code)

typedef void(*	DiagMsgCB_T )(const char *msg)

Static Public Attributes inherited from VetsUtil::MyBase
static char *	ErrMsg

static int	ErrCode

static int	ErrMsgSize

static FILE *	ErrMsgFilePtr

static ErrMsgCB_T	ErrMsgCB

static char *	DiagMsg

static int	DiagMsgSize

static FILE *	DiagMsgFilePtr

static DiagMsgCB_T	DiagMsgCB

static bool	Enabled

Protected Member Functions inherited from VetsUtil::MyBase
void	SetClassName (const string &name)

Detailed Description

A class for managing data set metadata.

Author: John Clyne

Version: $Revision$

Date: $Date$

This class performs either lossy compression decomposition on an array with an arbitrary number of dimensions (up to 3 presently). Compression is performed by transforming data with a wavelet transform, sorting the resulting coefficients, and returning the n largest magnitude coefficients.

Definition at line 29 of file Compressor.h.

Constructor & Destructor Documentation

VAPoR::Compressor::Compressor	(	std::vector< size_t >	dims,
		const string &	wname,
		const string &	mode
	)

Constructor for compressor class

This construct initializes a Compressor class object for use in compression or decomposition. The parameter wname specifies the name of the wavelet to use for subsequent wavelet transforms. The parameter wmode specifies the boundary extention mode to employ for transforms. For non-periodic data the biorthogonal wavelets with a with an appropriate symetric extension are recommended.

Parameters

[in]	dims	Vector specifying dimensions of arrays to be compressed
[in]	wname	Name of wavelet to use in transform
[in]	wmode	Boundary extention mode

See also: MatWaveBase, WaveFiltBase

VAPoR::Compressor::Compressor	(	std::vector< size_t >	dims,
		const string &	wname
	)

VAPoR::Compressor::~Compressor ( )

Member Function Documentation

double& VAPoR::Compressor::ClampMax ( )

inline

Set or get the maximum range clamp value

See also: ClampMaxOnOff(), Decompress(), Reconstruct()

Definition at line 340 of file Compressor.h.

bool& VAPoR::Compressor::ClampMaxOnOff ( )

inline

Set or get the max range clamping attribute

When set, this attribute will clamp the maximum data value reconstructed to the value of ClampMax(). I.e. all data values reconstructed by Decompress() or Reconstruct() will be less than or equal to the value returned by ClampMax(). By default clamping is disabled.

See also: ClampMin(), Decompress(), Reconstruct()

Definition at line 334 of file Compressor.h.

double& VAPoR::Compressor::ClampMin ( )

inline

Set or get the minimum range clamp value

See also: ClampMinOnOff(), Decompress(), Reconstruct()

Definition at line 322 of file Compressor.h.

bool& VAPoR::Compressor::ClampMinOnOff ( )

inline

Set or get the min range clamping attribute

When set, this attribute will clamp the minimum data value reconstructed to the value of ClampMin(). I.e. all data values reconstructed by Decompress() or Reconstruct() will be greater than or equal to the value returned by ClampMin(). By default clamping is disabled.

See also: ClampMin(), Decompress(), Reconstruct()

Definition at line 316 of file Compressor.h.

int VAPoR::Compressor::Compress	(	const float *	src_arr,
		float *	dst_arr,
		size_t	dst_arr_len,
		SignificanceMap *	sigmap
	)

Compress an array

This method compresses an input array and returns a compressed version of the data. Compression is performed by wavelet transforming the data and sorting the resulting wavelet coefficients. Only the largest dst_arr_len coefficients are returned.

Parameters

[in]	src_arr	The input array. The dimensions are determined by the constructor's `dims` parameter.
[out]	dst_arr	The output array that will contain the largest `dst_arr_len` coefficients from the transformed input array. `dst_arr` must point to enough space to contain `dst_arr_len` elements.
[out]	dst_arr_len	Length of `dst_arr`.
[in,out]	A	signficance map that, upon return, will provide the coordinates of the output coefficents returned.

Return values

status A negative value indicates failure

See also: SignificanceMap, KeepAppOnOff()

int VAPoR::Compressor::Compress	(	const double *	src_arr,
		double *	dst_arr,
		size_t	dst_arr_len,
		SignificanceMap *	sigmap
	)

static bool VAPoR::Compressor::CompressionInfo	(	vector< size_t >	dims,
		const string	wavename,
		bool	keepapp,
		size_t &	nlevels,
		size_t &	maxcratio
	)

static

int VAPoR::Compressor::Decompose	(	const float *	src_arr,
		float *	dst_arr,
		const vector< size_t > &	dst_arr_lens,
		vector< SignificanceMap > &	sigmaps
	)

Decompose an array into a series of approximations of increasingly better fidelity.

This method performs a wavelet decomposition of an array, sorts the resulting coefficients from largest to smallest, and returns the sorted coefficients as a collection of n sets, S_i. The absolute value of each element of a set S_i will be less than each element of a set S_i+1.

Parameters

[in]	src_arr	The input array. The dimensions are determined by the constructor's `dims` parameter.
[out]	dst_arr	The output array that will contain all of the sorted coefficients for each collection S_i.
[in]	dst_arr_lens	A vector whose size determines the number of collections S_i, and whose elements specify the number of elements in each collection S_i. The sum of all elements of `dst_arr_lens` must be less than or equal the total number of wavelet coefficients generated by the wavelet transform. The total is given by the size of the vector returned by GetSigMapShape().
[out]	sigmaps	An array of significance maps, one map for each coefficient collection, S_i

Return values

status A negative value indicates failure

See also: SignificanceMap, KeepAppOnOff(), Compress()

int VAPoR::Compressor::Decompose	(	const double *	src_arr,
		double *	dst_arr,
		const vector< size_t > &	dst_arr_lens,
		vector< SignificanceMap > &	sigmaps
	)

int VAPoR::Compressor::Decompress	(	const float *	src_arr,
		float *	dst_arr,
		SignificanceMap *	sigmap
	)

Decompress an array previously compressed with Compress()

Parameters

[in]	src_arr	The input array containing the coefficients previsously computed by Compress().
[out]	dst_arr	The output array that will contain uncompressed array. `dst_arr` must point to enough space to contain The entire uncompressed array
[in]	The	signficance map that returned by Compress() for `src_arr`

Return values

status A negative value indicates failure

See also: Compress()

int VAPoR::Compressor::Decompress	(	const double *	src_arr,
		double *	dst_arr,
		SignificanceMap *	sigmap
	)

double& VAPoR::Compressor::Epsilon ( )

inline

Set or get the epsilon value

See also: EpsilonOnOff(), Decompress(), Reconstruct()

Definition at line 358 of file Compressor.h.

bool& VAPoR::Compressor::EpsilonOnOff ( )

inline

Set or get the epsilon attribute

When set, this attribute will compare the absolute value of reconstructed data with Epsilon(). If abs(v) is less than epsilon the value of v is set to 0.0. By default the epsilon comparison is disabled.

See also: Epsilon(), Decompress(), Reconstruct()

Definition at line 352 of file Compressor.h.

void VAPoR::Compressor::GetDimension	(	vector< size_t > &	dims,
		int	l
	)		const

Returns the dimensions of a reconstructed array

This method returns the dimensions of an array reconstructed with either the Reconstruct() or Decompress() methods. The parameter l specifies the number of inverse transformation passes applied in the range -1 to max, where max is the value returned by GetNumLevels(). A value of -1 corresponds to max levels. A value of zero implies no inverse transformations are performed (the dimensions returned are those of the wavelet approximation coefficients).

Parameters

[out]	dims	The dimensions of the reconstructed array.
[in]	l	The number of inverse transforms to apply

See also: Compressor(), GetNumLevels()

size_t VAPoR::Compressor::GetMinCompression ( ) const

Returns the number of coefficients in the smallest allowable compression

Returns the minimum number of wavelet coefficients allowable after compression. The minimum number of of coefficients is determined by a combination of the wavelet, the boundary extension handling method, the dimensions of the array, and the setting of KeepAppOnOff()

Return values

nlevels Number of transformation levels

int VAPoR::Compressor::GetNumLevels ( ) const

inline

Returns the number of transformation levels

Returns the number of forward or inverse wavelet transformations applied to compress or fully reconstruct an array. The number of of transforms is determined by a combination of the wavelet, the boundary extension handling method, and the dimensions of the array.

Return values

nlevels Number of transformation levels

Definition at line 282 of file Compressor.h.

size_t VAPoR::Compressor::GetNumWaveCoeffs ( ) const

inline

Returns the number of wavelet coefficients resulting from a forward wavelet transformation of an array.

Returns the number of wavelet coefficients resulting from a forward wavelet transformation of an array based on the parameters supplied to the class constructor. The number of coefficients resulting from a wavelet transform is a function of the dimensions of the array, the wavlet familiy used, the boundary handling method, and the number of transformation levels.

Note: For periodic boundary handling, or symetric wavelets matched with appropriate symetric boundary handling, the number of coefficients in the transform is guaranteed to match the number of coefficients in the input array.

See also: Compress(), Decompose()

Definition at line 240 of file Compressor.h.

Referenced by GetSigMapSize().

void VAPoR::Compressor::GetSigMapShape ( std::vector< size_t > & dims ) const

inline

Return true if the given grid array is compressible

Return true if the given grid array is compressible based on it's dimension and the requested wavelet. I.e. returns true if at least one dimension is wide enough for a single wavelet transform

Parameters

[in]	dims	Vector specifying dimensions of arrays to be compressed
[in]	wname	Name of wavelet to use in transform
[in]	wmode	Boundary extention mode

See also: MatWaveBase, WaveFiltBaseReturns the shape of significance maps based on constructor

This method returns the shape of any significance maps configured by the Compress() or Decompose() method based on parameters passed to the class constructor.

Parameters

[out] dims A vector describing the shap (dimensions) of a significance map

See also: SignificanceMap, Compress(), Decompose()

Definition at line 218 of file Compressor.h.

size_t VAPoR::Compressor::GetSigMapSize ( size_t num_entries ) const

inline

Returns the size of an encoded SignficanceMap()

Returns the size in bytes of an encoded SignificanceMap() used to store num_entries entries.

See also: Compress(), Decompose()

Definition at line 249 of file Compressor.h.

References VAPoR::SignificanceMap::GetMapSize(), and GetNumWaveCoeffs().

bool& VAPoR::Compressor::KeepAppOnOff ( )

inline

Set or get the keep approximations attribute

When set, this attribute ensures that all wavelet approximation coefficients are retained during compression or decomposition. Setting this attribute will decrease the maximum possible compression, but may significantly improve the fidelity of the approximation

Definition at line 304 of file Compressor.h.

int VAPoR::Compressor::Reconstruct	(	const float *	src_arr,
		float *	dst_arr,
		vector< SignificanceMap > &	sigmaps,
		int	l
	)

Reconstruct a signal decomposed with Decompose()

This method reconstructs a signal previosly decomposed with Decompose(). Partial reconstructions are possible using one of two methods, both of which may be combined. In the first the a subset of coefficient collections S_i may be used for reconstruction. In this case missing coefficients are simply treated as having value zero. Note that arbitrary S_i cannot be specified: the collections must be ordered with i less than or equal to the total number of collections returned by Decompose().

The second method of partial reconstruction is to limit the number of inverse wavelet transforms applied to the coefficients. In this case the reconstructed array will be coarsened (contain fewer elements) than the original. The dimensions of the reconstructed array are given by GetDimension().

Parameters

[in]	src_arr	The input array containing the coefficients previsously computed by Decompose().
[out]	dst_arr	The output array containing reconstructed signal. The dimensions of `dst_arr` are determined by GetDimension(). If `l` is -1, the dimensions will be the same as those specified by the class constructor's `dims` parameter
[in]	sigmaps	An array of significance maps previosly returned by Decompose()
[in]	l	The refinement level. `l` must be in the range -1 to max, where max is the value returned by GetNumLevels(). If `is` -1 its value will be set to max. A value of zero coresponds to the approximation level coefficients.

Return values

status A negative value indicates failure

See also: SignificanceMap, KeepAppOnOff(), Compress()

int VAPoR::Compressor::Reconstruct	(	const double *	src_arr,
		double *	dst_arr,
		vector< SignificanceMap > &	sigmaps,
		int	l
	)

Friends And Related Function Documentation

std::ostream& operator<<	(	std::ostream &	o,
		const Compressor &	rhs
	)

friend

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

/Users/clyne/src/vapor/lib/vdf/Compressor.h

Public Member Functions

Static Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation