#include <Stretch.h>

Inheritance diagram for Isis::Stretch:

Collaboration diagram for Isis::Stretch:

Public Member Functions
	Stretch ()
	Constructs a Stretch object with default mapping of special pixel values to themselves.

	~Stretch ()
	Destroys the Stretch object.

void	AddPair (const double input, const double output)
	Adds a stretch pair to the list of pairs.

void	SetNull (const double value)
	Sets the mapping for NULL pixels.

void	SetLis (const double value)
	Sets the mapping for LIS pixels.

void	SetLrs (const double value)
	Sets the mapping for LRS pixels.

void	SetHis (const double value)
	Sets the mapping for HIS pixels.

void	SetHrs (const double value)
	Sets the mapping for HRS pixels.

void	SetMinimum (const double value)

void	SetMaximum (const double value)

void	Load (Pvl &pvl, QString &grpName)
	Loads the stretch pairs from the pvl file into the Stretch object.

void	Save (Pvl &pvl, QString &grpName)

void	Load (QString &file, QString &grpName)
	Loads the stretch pairs from the pvl file into the Stretch object.

void	Save (QString &file, QString &grpName)
	Saves the stretch pairs in the Stretch object into the given pvl file.

double	Map (const double value) const
	Maps an input value to an output value based on the stretch pairs and/or special pixel mappings.

void	Parse (const QString &pairs)
	Parses a string of the form "i1:o1 i2:o2...iN:oN" where each i:o represents an input:output pair.

void	Parse (const QString &pairs, const Isis::Histogram *hist)
	Parses a string of the form "i1:o1 i2:o2...iN:oN" where each i:o represents an input:output pair where the input is a percentage.

QString	Text () const
	Converts stretch pair to a string.

int	Pairs () const
	Returns the number of stretch pairs.

double	Input (const int index) const
	Returns the value of the input side of the stretch pair at the specified index.

double	Output (const int index) const
	Returns the value of the output side of the stretch pair at the specified index.

void	ClearPairs ()
	Clears the stretch pairs.

void	CopyPairs (const Stretch &other)
	Copies the stretch pairs from another Stretch object, but maintains special pixel values.

Detailed Description

Pixel value mapper.

This class is used to stretch or remap pixel values. For example, it can be used to apply contrast stretches, color code stretches, or remap from a double range to 8-bit (0 to 255). The methodology used is straightforward. The program must set up a list of stretch pairs, input-to-output mappings, using the AddPair method. For example, (0,0) and (1,255) are two pairs which would cause an input of 0 to be mapped to 0, 0.5 would be mapped to 127.5 and 1 would be mapped to 255. More than two pairs can be used which generates piece-wise linear mappings. Special pixels are mapped to themselves unless overridden with methods such as SetNull. Input values outside the minimum and maximum input pair values are mapped to LRS and HRS respectively.

If you would like to see Stretch being used in implementation, see stretch.cpp

Author: 2002-05-15 Jeff Anderson

Constructor & Destructor Documentation

◆ Stretch()

Isis::Stretch::Stretch ( )

Constructs a Stretch object with default mapping of special pixel values to themselves.

References Isis::HIGH_INSTR_SAT8, Isis::HIGH_REPR_SAT8, Isis::LOW_INSTR_SAT8, Isis::LOW_REPR_SAT8, and Isis::NULL8.

◆ ~Stretch()

Isis::Stretch::~Stretch ( )

inline

Destroys the Stretch object.

Member Function Documentation

◆ AddPair()

void Isis::Stretch::AddPair	(	const double	input,
		const double	output )

Adds a stretch pair to the list of pairs.

Note that all input pairs must be in ascending order.

Parameters

input	Input value to map
output	Output value when the input is mapped

Exceptions

Isis::IException::Programmer - input pairs must be in ascending order

References _FILEINFO_, and Isis::IException::Programmer.

Referenced by Isis::GaussianStretch::GaussianStretch(), Load(), Parse(), Parse(), Isis::VisualDisplay::setPixelData(), Isis::BinaryStretchType::setStretch(), Isis::StretchTool::stretchBand(), and Isis::StretchTool::stretchBuffer().

◆ ClearPairs()

void Isis::Stretch::ClearPairs ( )

inline

Clears the stretch pairs.

Referenced by Isis::GaussianStretch::GaussianStretch(), Isis::VisualDisplay::setPixelData(), and Isis::StretchTool::stretchBand().

◆ CopyPairs()

void Isis::Stretch::CopyPairs ( const Stretch & other )

Copies the stretch pairs from another Stretch object, but maintains special pixel values.

Parameters

other - The Stretch to copy pairs from

Referenced by Isis::StretchTool::loadStretchFromCube(), Isis::BinaryStretchType::setStretch(), Isis::LinearStretchType::setStretch(), Isis::ManualStretchType::setStretch(), Isis::SawtoothStretchType::setStretch(), and Isis::StretchTool::stretchRequested().

◆ Input()

double Isis::Stretch::Input ( const int index ) const

Returns the value of the input side of the stretch pair at the specified index.

If the index number is out of bounds, then the method returns -1

Parameters

index The index number to retrieve the input stretch pair value from

Returns: double The input side of the stretch pair at the specified index

Referenced by Save(), Isis::HistogramWidget::setStretch(), Isis::LinearStretchType::setStretch(), and Isis::StretchType::updateTable().

◆ Load() [1/2]

void Isis::Stretch::Load	(	Isis::Pvl &	pvl,
		QString &	grpName )

Loads the stretch pairs from the pvl file into the Stretch object.

The pvl should look similar to this:

Group = Pairs
  Input = (0,100,255)
  Output = (255,100,0)
EndGroup

Parameters

pvl	- The pvl containing the stretch pairs
grpName	- The group name to get the input and output keywords from

References _FILEINFO_, AddPair(), Isis::toDouble(), Isis::PvlObject::Traverse, and Isis::IException::User.

Referenced by Load().

◆ Load() [2/2]

void Isis::Stretch::Load	(	QString &	file,
		QString &	grpName )

Loads the stretch pairs from the pvl file into the Stretch object.

The file should look similar to this:

Group = Pairs
  Input = (0,100,255)
  Output = (255,100,0)
EndGroup

Parameters

file	- The input file containing the stretch pairs
grpName	- The group name to get the input and output keywords from

References Load().

◆ Map()

double Isis::Stretch::Map ( const double value ) const

Maps an input value to an output value based on the stretch pairs and/or special pixel mappings.

Parameters

value Value to map

Returns: double The mapped output value is returned by this method

References Isis::IsHisPixel(), Isis::IsHrsPixel(), Isis::IsLisPixel(), Isis::IsNullPixel(), and Isis::IsValidPixel().

Referenced by Isis::GaussianStretch::Map(), and Isis::VisualDisplay::paintPixmap().

◆ Output()

double Isis::Stretch::Output ( const int index ) const

Returns the value of the output side of the stretch pair at the specified index.

If the index number is out of bounds, then the method returns -1.

Parameters

index The index number to retieve the output stretch pair value from

Returns: double The output side of the stretch pair at the specified index

Referenced by Save(), Isis::HistogramWidget::setStretch(), and Isis::StretchType::updateTable().

◆ Pairs()

int Isis::Stretch::Pairs ( ) const

inline

Returns the number of stretch pairs.

Referenced by Save(), Isis::HistogramWidget::setStretch(), Isis::CubeViewport::stretchBlue(), Isis::StretchTool::stretchBuffer(), Isis::CubeViewport::stretchGray(), Isis::CubeViewport::stretchGreen(), Isis::CubeViewport::stretchRed(), and Isis::StretchType::updateTable().

◆ Parse() [1/2]

void Isis::Stretch::Parse ( const QString & pairs )

Parses a string of the form "i1:o1 i2:o2...iN:oN" where each i:o represents an input:output pair.

Therefore, the user can enter a string in this form and this method will parse the string and load the stretch pairs into the object via AddPairs.

Parameters

pairs A string containing stretch pairs for example "0:0 50:0 100:255 255:255"

Exceptions

Isis::IException::User - invalid stretch pair

References _FILEINFO_, AddPair(), and Isis::IException::User.

Referenced by Isis::CubeStretch::CubeStretch(), Isis::CubeViewport::stretchBlue(), Isis::CubeViewport::stretchGray(), Isis::CubeViewport::stretchGreen(), and Isis::CubeViewport::stretchRed().

◆ Parse() [2/2]

void Isis::Stretch::Parse	(	const QString &	pairs,
		const Isis::Histogram *	hist )

Parses a string of the form "i1:o1 i2:o2...iN:oN" where each i:o represents an input:output pair where the input is a percentage.

Using the Histogram an appropriate dn value will be calculated for each input percentage. Therefore, the user can enter a string in this form and this method will parse the string and load the stretch pairs into the object via AddPairs.

Parameters

pairs A string containing stretch pairs for example "0:0 50:0 100:255"

Exceptions

Isis::IException::User - invalid stretch pair

References _FILEINFO_, AddPair(), and Isis::IException::User.

◆ Save() [1/2]

void Isis::Stretch::Save	(	Isis::Pvl &	pvl,
		QString &	grpName )

References Input(), Output(), Pairs(), and Isis::toString().

Referenced by Save().

◆ Save() [2/2]

void Isis::Stretch::Save	(	QString &	file,
		QString &	grpName )

Saves the stretch pairs in the Stretch object into the given pvl file.

Parameters

file	- The file that the stretch pairs will be written to
grpName	- The name of the group to create and put the stretch pairs into. The group will contain two keywords, Input, and Output.

References Save().

◆ SetHis()

void Isis::Stretch::SetHis ( const double value )

inline

Sets the mapping for HIS pixels.

If not called the HIS pixels will be mapped to HIS. Otherwise you can map HIS to any double value. For example, SetHis(255.0).

Parameters

value Value to map input HIS

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetHrs()

void Isis::Stretch::SetHrs ( const double value )

inline

Sets the mapping for HRS pixels.

If not called the HRS pixels will be mapped to HRS. Otherwise you can map HRS to any double value. For example, SetHrs(255.0).

Parameters

value Value to map input HRS

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetLis()

void Isis::Stretch::SetLis ( const double value )

inline

Sets the mapping for LIS pixels.

If not called the LIS pixels will be mapped to LIS. Otherwise you can map LIS to any double value. For example, SetLis(0.0).

Parameters

value Value to map input LIS

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetLrs()

void Isis::Stretch::SetLrs ( const double value )

inline

Sets the mapping for LRS pixels.

If not called the LRS pixels will be mapped to LRS. Otherwise you can map LRS to any double value. For example, SetLrs(0.0).

Parameters

value Value to map input LRS

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetMaximum()

void Isis::Stretch::SetMaximum ( const double value )

inline

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetMinimum()

void Isis::Stretch::SetMinimum ( const double value )

inline

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ SetNull()

void Isis::Stretch::SetNull ( const double value )

inline

Sets the mapping for NULL pixels.

If not called the NULL pixels will be mapped to NULL. Otherwise you can map NULLs to any double value. For example, SetNull(0.0).

Parameters

value Value to map input NULLs

Referenced by Isis::CubeViewport::BandInfo::BandInfo(), Isis::QStretch::QStretch(), and Isis::VisualDisplay::VisualDisplay().

◆ Text()

QString Isis::Stretch::Text ( ) const

Converts stretch pair to a string.

Returns: string The stretch pair as a string

References Isis::toString().

Referenced by Isis::CubeStretch::operator==(), Isis::BinaryStretchType::setStretch(), Isis::LinearStretchType::setStretch(), Isis::ManualStretchType::setStretch(), and Isis::CubeStretch::toBlob().

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

/Users/astamile/ISIS3/isis/src/base/objs/Stretch/Stretch.h
/Users/astamile/ISIS3/isis/src/base/objs/Stretch/Stretch.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ Stretch()

◆ ~Stretch()

Member Function Documentation

◆ AddPair()

◆ ClearPairs()

◆ CopyPairs()

◆ Input()

◆ Load() [1/2]

◆ Load() [2/2]

◆ Map()

◆ Output()

◆ Pairs()

◆ Parse() [1/2]

◆ Parse() [2/2]

◆ Save() [1/2]

◆ Save() [2/2]

◆ SetHis()

◆ SetHrs()

◆ SetLis()

◆ SetLrs()

◆ SetMaximum()

◆ SetMinimum()

◆ SetNull()

◆ Text()