te::se::ContrastEnhancement Class Reference

ContrastEnhancement defines the 'stretching' of contrast for a channel of a false-color image or for a whole grey/color image. More...

#include <ContrastEnhancement.h>

Inheritance diagram for te::se::ContrastEnhancement:

Public Types
enum	ContrastEnhancementType { ENHANCEMENT_NORMALIZE, ENHANCEMENT_HISTOGRAM, ENHANCEMENT_NONE }
	The type of contrast enhancement. More...

Public Member Functions
ContrastEnhancement *	clone () const
	It creates a new copy of this object. More...
Initializer Methods
Methods related to instantiation and destruction.
	ContrastEnhancement ()
	It initializes a new ContrastEnhancement. More...
	~ContrastEnhancement ()
	Destructor. More...
Accessor methods
Methods used to get or set properties.
void	setContrastEnhancementType (ContrastEnhancementType t)
ContrastEnhancementType	getContrastEnhancementType () const
void	setGammaValue (const double &v)
double	getGammaValue () const

Private Attributes
ContrastEnhancementType	m_contrast
	Contrast enhancement type. (Optional) More...
double	m_gammaValue
	It tells how much to brighten (values greater than 1.0) or dim (values less than 1.0) an image. (Optional) More...

Detailed Description

ContrastEnhancement defines the 'stretching' of contrast for a channel of a false-color image or for a whole grey/color image.

Contrast enhancement is used to make ground features in images more visible. In the case of a color image, the relative grayscale brightness of a pixel color is used. Normalize means to stretch the contrast so that the dimmest color is stretched to black and the brightest color is stretched to white, with all colors in between stretched out linearly. Histogram means to stretch the contrast based on a histogram of how many colors are at each brightness level on input, with the goal of producing equal number of pixels in the image at each brightness level on output. This has the effect of revealing many subtle ground features. A GammaValue tells how much to brighten (values greater than 1.0) or dim (values less than 1.0) an image. The default GammaValue is 1.0 (no change). If none of Normalize, Histogram, or GammaValue are selected in a ContrastEnhancement, then no enhancement is performed.

See also

SelectedChannel, RasterSymbolizer

Definition at line 64 of file ContrastEnhancement.h.

Member Enumeration Documentation

enum te::se::ContrastEnhancement::ContrastEnhancementType

The type of contrast enhancement.

Enumerator
ENHANCEMENT_NORMALIZE	It means to stretch the contrast so that the dimmest color is stretched to black and the brightest color is stretched to white, with all colors in between stretched out linearly.
ENHANCEMENT_HISTOGRAM	It means to stretch the contrast based on a histogram of how many colors are at each brightness level on input, with the goal of producing equal number of pixels in the image at each brightness level on output. This has the effect of revealing many subtle ground features.
ENHANCEMENT_NONE	No contrast enhancement must be applied.

Definition at line 73 of file ContrastEnhancement.h.

Constructor & Destructor Documentation

te::se::ContrastEnhancement::ContrastEnhancement

(

)

It initializes a new ContrastEnhancement.

te::se::ContrastEnhancement::~ContrastEnhancement

(

)

Destructor.

Member Function Documentation

ContrastEnhancement* te::se::ContrastEnhancement::clone

(

)

const

It creates a new copy of this object.

ContrastEnhancementType te::se::ContrastEnhancement::getContrastEnhancementType ( ) const

inline

Definition at line 110 of file ContrastEnhancement.h.

double te::se::ContrastEnhancement::getGammaValue ( ) const

inline

Definition at line 114 of file ContrastEnhancement.h.

void te::se::ContrastEnhancement::setContrastEnhancementType

(

ContrastEnhancementType

t

)

void te::se::ContrastEnhancement::setGammaValue

(

const double &

v

)

Member Data Documentation

ContrastEnhancementType te::se::ContrastEnhancement::m_contrast

private

Contrast enhancement type. (Optional)

Definition at line 123 of file ContrastEnhancement.h.

double te::se::ContrastEnhancement::m_gammaValue

private

It tells how much to brighten (values greater than 1.0) or dim (values less than 1.0) an image. (Optional)

Definition at line 124 of file ContrastEnhancement.h.

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

• /home/castejon/castejon_files/develop/terralib5/git_master/src/terralib/se/ContrastEnhancement.h