DcmQuantPixel Class Reference

objects of this class represent individual RGB pixels. More...

Inheritance diagram for DcmQuantPixel:

Public Member Functions
	DcmQuantPixel ()
	default constructor, creates black pixel
	DcmQuantPixel (const DcmQuantPixel &arg)
	copy assignment constructor
virtual	~DcmQuantPixel ()
	destructor
OFBool	operator== (const DcmQuantPixel &src) const
	comparison operator for equality
double	luminance () const
	this method computes the luminance of the current pixel according to the NTSC formula. More...
unsigned long	hash () const
	this method computes an unsigned long hash value for the current pixel. More...
DcmQuantComponent	getRed () const
	returns the red component More...
DcmQuantComponent	getGreen () const
	returns the green component More...
DcmQuantComponent	getBlue () const
	returns the blue component More...
void	assign (DcmQuantComponent r, DcmQuantComponent g, DcmQuantComponent b)
	assigns new R, G and B values to this pixel More...
void	scale (DcmQuantComponent r, DcmQuantComponent g, DcmQuantComponent b, const DcmQuantScaleTable &table)
	assigns new R, G and B values to this pixel using the given scale table in which all three values are looked up. More...

Private Attributes
DcmQuantComponent	red
	red color component of this pixel
DcmQuantComponent	green
	green color component of this pixel
DcmQuantComponent	blue
	blue color component of this pixel

Detailed Description

objects of this class represent individual RGB pixels.

This class is used by the color quantization classes. For efficiency considerations, all methods are declared inline.

Member Function Documentation

assign()

void DcmQuantPixel::assign ( DcmQuantComponent  r, DcmQuantComponent  g, DcmQuantComponent  b  )

inline

assigns new R, G and B values to this pixel

Parameters

r	new R
g	new G
b	new B

getBlue()

DcmQuantComponent DcmQuantPixel::getBlue ( ) const

inline

returns the blue component

Returns

blue component of this pixel

Referenced by DcmQuantFloydSteinberg::adjust().

getGreen()

DcmQuantComponent DcmQuantPixel::getGreen ( ) const

inline

returns the green component

Returns

green component of this pixel

Referenced by DcmQuantFloydSteinberg::adjust().

getRed()

DcmQuantComponent DcmQuantPixel::getRed ( ) const

inline

returns the red component

Returns

red component of this pixel

Referenced by DcmQuantFloydSteinberg::adjust().

hash()

unsigned long DcmQuantPixel::hash ( ) const

inline

this method computes an unsigned long hash value for the current pixel.

The hash algorithm is taken from Jef Poskanzer's ppm utility library. The return value is guaranteed to be < DcmQuantHashSize.

Returns

hash value for current pixel

Referenced by DcmQuantColorHashTable::item(), and DcmQuantColorHashTable::lookup().

luminance()

double DcmQuantPixel::luminance ( ) const

inline

this method computes the luminance of the current pixel according to the NTSC formula.

The range of the luminance equals the range of the underlying DcmQuantComponent type. However, the luminance is returned as a double.

Returns

luminance of this pixel

scale()

void DcmQuantPixel::scale ( DcmQuantComponent  r, DcmQuantComponent  g, DcmQuantComponent  b, const DcmQuantScaleTable &  table  )

inline

assigns new R, G and B values to this pixel using the given scale table in which all three values are looked up.

Parameters

r	new R
g	new G
b	new B
table	scale table (LUT) in which R, G and B are looked up.

---

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

• dcmimage/include/dcmtk/dcmimage/diqtpix.h