DcmQuantScaleTable Class Reference

this is a helper class used for temporarily reducing the image bit depth during calculation of an image histogram. More...

Public Member Functions
	DcmQuantScaleTable ()
	constructor
	~DcmQuantScaleTable ()
	destructor
DcmQuantComponent	operator[] (unsigned int idx) const
	array look-up operation. More...
void	createTable (unsigned long oldmaxval, unsigned long newmaxval)
	initializes the look-up table. More...

Private Member Functions
void	cleanup ()
	resets the object to the default-constructed state
	DcmQuantScaleTable (const DcmQuantScaleTable &src)
	private undefined copy constructor
DcmQuantScaleTable &	operator= (const DcmQuantScaleTable &src)
	private undefined copy assignment operator

Private Attributes
DcmQuantComponent *	table
	array of pixel values
unsigned int	numEntries
	number of entries in array

Detailed Description

this is a helper class used for temporarily reducing the image bit depth during calculation of an image histogram.

An object of this class contains a look-up table that maps image pixel values to scaled-down image pixel values.

Member Function Documentation

createTable()

void DcmQuantScaleTable::createTable ( unsigned long  oldmaxval, unsigned long  newmaxval  )

inline

initializes the look-up table.

Parameters

oldmaxval	maximum possible pixel value in source image
newmaxval	new desired maximum value, should be < oldmaxval

operator[]()

DcmQuantComponent DcmQuantScaleTable::operator[] ( unsigned int  idx ) const

inline

array look-up operation.

Parameters

idx	pixel value to look up. Object must be initialized (i.e. createTable() must have been called before) and idx must be less or equal to the parameter oldmaxval passed to createTable().

Returns

scaled-down value from look-up table.

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

• dcmimage/include/dcmtk/dcmimage/diqtstab.h