OFFIS DCMTK: DcmQuantFloydSteinberg Class Reference

List of all members.


Public Member Functions
	DcmQuantFloydSteinberg ()
	constructor
	~DcmQuantFloydSteinberg ()
	destructor
OFCondition	initialize (unsigned long cols)
	initializes the Floyd-Steinberg error vectors for an image with the given number of columns.
void	adjust (DcmQuantPixel &px, long col, long maxval)
	uses the Floyd-Steinberg error vectors to adjust the color of the current image pixel.
void	propagate (const DcmQuantPixel &px, const DcmQuantPixel &mapped, long col)
	propagates the Floyd-Steinberg error terms for one pixel.
void	startRow (long &col, long &limitcol)
	starts error diffusion for a new row.
void	finishRow ()
	finishes error diffusion for one image row.
void	nextCol (long &col) const
	increases or decreases the column number depending on the direction flag.
Private Member Functions
void	cleanup ()
	frees all memory allocated by the error vectors
	DcmQuantFloydSteinberg (const DcmQuantFloydSteinberg &src)
	private undefined copy constructor
DcmQuantFloydSteinberg &	operator= (const DcmQuantFloydSteinberg &src)
	private undefined copy assignment operator
Private Attributes
long *	thisrerr
	current red error vector. Points to an array of (columns + 2) entries.
long *	nextrerr
	red error vector for next row. Points to an array of (columns + 2) entries.
long *	thisgerr
	current green error vector. Points to an array of (columns + 2) entries.
long *	nextgerr
	green error vector for next row. Points to an array of (columns + 2) entries.
long *	thisberr
	current blue error vector. Points to an array of (columns + 2) entries.
long *	nextberr
	blue error vector for next row. Points to an array of (columns + 2) entries.
long *	temperr
	temporary pointer used for swapping error vectors
int	fs_direction
	boolean flag indicating in which direction (left to right/right to left) the FS distribution should be done.
unsigned long	columns
	number of columns in image

Detailed Description

Member Function Documentation

OFCondition DcmQuantFloydSteinberg::initialize ( unsigned long cols )

initializes the Floyd-Steinberg error vectors for an image with the given number of columns.

Parameters:

cols

number of columns in image

Returns:: EC_Normal if successful, an error code otherwise.

void DcmQuantFloydSteinberg::adjust	(	DcmQuantPixel &	px,
		long	col,
		long	maxval
	)			`[inline]`

uses the Floyd-Steinberg error vectors to adjust the color of the current image pixel.

Parameters:

	px	the original image pixel is passed in this parameter. Upon return, the pixel value contains the new value after error diffusion.
	col	column in which the current pixel is located, must be [0..columns-1]
	maxval	maximum value for each color component.

Definition at line 71 of file diqtfs.h.

References DcmQuantPixel::assign(), DcmQuantPixel::getBlue(), DcmQuantPixel::getGreen(), DcmQuantPixel::getRed(), thisberr, thisgerr, and thisrerr.

void DcmQuantFloydSteinberg::propagate	(	const DcmQuantPixel &	px,
		const DcmQuantPixel &	mapped,
		long	col
	)			`[inline]`

propagates the Floyd-Steinberg error terms for one pixel.

Parameters:

	px	color value the current image pixel should have (after adjustment)
	mapped	color value (selected from the color LUT) the current image pixel really uses
	col	column in which the current pixel is located, must be [0..columns-1]

Definition at line 90 of file diqtfs.h.

References fs_direction, DcmQuantPixel::getBlue(), DcmQuantPixel::getGreen(), DcmQuantPixel::getRed(), nextberr, nextgerr, nextrerr, thisberr, thisgerr, and thisrerr.

void DcmQuantFloydSteinberg::startRow	(	long &	col,
		long &	limitcol
	)			`[inline]`

starts error diffusion for a new row.

The error vectors for the next image row are initialized to zero. The initial and last column of the current row are determined

Parameters:

	col	initial column for the current row returned in this parameter
	limitcol	limit column (one past the last valid column) for the current row returned in this parameter. May become negative.

Definition at line 140 of file diqtfs.h.

References columns, fs_direction, nextberr, nextgerr, and nextrerr.

void DcmQuantFloydSteinberg::finishRow ( ) [inline]

finishes error diffusion for one image row.

The direction flag is inverted and the error vectors for the "current" and "next" image row are swapped.

Definition at line 161 of file diqtfs.h.

References fs_direction, nextberr, nextgerr, nextrerr, temperr, thisberr, thisgerr, and thisrerr.