class LevelSets2D : public Data2D, public DeformableModel2D

a 2D level set

Inheritance:

Public Methods

	LevelSets2D (Scene2D *scene, unsigned int xdim, unsigned int ydim, Contour2D &contour, double vx = 1.0, double vy = 1.0, unsigned int narrowBandWidth = 0) 2D level set constructor
virtual	~LevelSets2D () destroy level set and associated isocontour
const Inrimage&	getInrimage (void) const returns buffer image
void	setFirstNarrowBandWidth (const double _size) set the size of the first narrow band
void	setSecondNarrowBandWidth (const double _size) set the size of the second narrow band
virtual void	redraw (Camera2D *cam) redraw method
virtual void	updateCenter (Vec2& center, unsigned int& n) Returns the graphic object center and weight
virtual double	updateRadius (const Vec2& center) returns the graphic object radius given its center
virtual double	computeClosestDistance (MouseClick& mc) const returns closest distance from mouse click
virtual void	iterate (const unsigned int n) routine that performs some deformation iterations on a deformable model
TclLevelSets2D*	getInterface (void) const returns object interface

Protected Fields

Inrimage*	image the main image where the level sets are defined
Inrimage*	curvature the curvature image
IsoLevel2D*	isolevel associated isocontour for visualization
double	dt the time step used during each iteration based on an explicit scheme
double	firstNarrowBandWidth the size in terms of distance of the first narrow band where the level set should always belong
double	secondNarrowBandWidth the size in terms of distance of the second narrow band where all voxels are updated
std::list <VoxelComputation *>	firstNarrowBand the first narrow band that contains the level set corresponding to the isovalue 0
std::list <VoxelComputation *>	secondNarrowBand the second narrow band where all voxels are updated
double	balloon balloon force coefficient
bool	modified does the 0 level set need to be recomputed for display
bool	drawNarrowBand whether to draw narrow band
bool	narrowBandModified whether narrow band chaged since last redraw

Private Methods

void	initBufferFromContour (Contour2D &contour) Sets each voxel to the signed distance to the closest vertex of a given contour
void	buildNarrowBand () build level set narrow band once it has been initialized
void	resetNarrowBand () reset narrow band after the level set crashes
void	setTag (const char *tag) change isocontour set graphic tag
static double	getCurvatureTimesNorm (double ***src, unsigned int x, unsigned int y, unsigned int z) compute curvature * |gradient(image)| in src image at voxel (x,y,z)
static double	getCurvatureAndNorm (double ***src, unsigned int x, unsigned int y, unsigned int z, double &norm) compute curvature in src image at voxel (x,y,z)
static double	getExternal (double ***src, unsigned int x, unsigned int y, unsigned int z, double v) compute v * |gradient(image)| using a stable scheme

class VoxelComputation

a narrow-band voxel

unsigned int row

the row index of the voxel

unsigned int col

the column index of the voxel

double& value

the reference of the voxel value in the double image

VoxelComputation(unsigned int r, unsigned int c, double &v)

builds a voxel from its location in image plane and value

Parameters:

r - voxel row (Y coordinate)
c - voxel column (X coordinate)
v - voxel value

unsigned int getRow() const

returns voxel row (Y coordinate)

unsigned int getColumn() const

returns voxel columne (X coordinate)

double getValue() const

returns voxel value (at create time)

Inrimage* image

the main image where the level sets are defined

Inrimage* curvature

the curvature image

IsoLevel2D* isolevel

associated isocontour for visualization

double dt

the time step used during each iteration based on an explicit scheme

double firstNarrowBandWidth

the size in terms of distance of the first narrow band where the level set should always belong

double secondNarrowBandWidth

the size in terms of distance of the second narrow band where all voxels are updated

std::list <VoxelComputation *> firstNarrowBand

the first narrow band that contains the level set corresponding to the isovalue 0.0

std::list <VoxelComputation *> secondNarrowBand

the second narrow band where all voxels are updated

double balloon

balloon force coefficient

bool modified

does the 0 level set need to be recomputed for display

bool drawNarrowBand

whether to draw narrow band

bool narrowBandModified

whether narrow band chaged since last redraw

LevelSets2D(Scene2D *scene, unsigned int xdim, unsigned int ydim, Contour2D &contour, double vx = 1.0, double vy = 1.0, unsigned int narrowBandWidth = 0)

2D level set constructor

Parameters:

scene - 2D scene to put level set in
xdim - level set buffer X dimension
xdim - level set buffer Y dimension
ratio - image voxel/level set sampling ratio
vx - X sampling frequency (X voxel size)
vy - Y sampling frequency (Y voxel size)
narrowBandWidth - narrow band width (0 = no narrow band)

virtual ~LevelSets2D()

destroy level set and associated isocontour

const Inrimage& getInrimage(void) const

returns buffer image

void setFirstNarrowBandWidth(const double _size)

set the size of the first narrow band

void setSecondNarrowBandWidth(const double _size)

set the size of the second narrow band

virtual void redraw(Camera2D *cam)

redraw method

Parameters:

cam - camera to redraw level set in

virtual void updateCenter(Vec2& center, unsigned int& n)

Returns the graphic object center and weight. The weight is a measure of the number of primitives to allow barycentric computation of the whole scene center.

Parameters:

center - returned center
n - returned weight

virtual double updateRadius(const Vec2& center)

returns the graphic object radius given its center

Returns:

object radius

Parameters:

object - center

virtual double computeClosestDistance(MouseClick& mc) const

returns closest distance from mouse click

virtual void iterate(const unsigned int n)

routine that performs some deformation iterations on a deformable model

Parameters:

n - the number of iterations to performed. Can be set to zero

TclLevelSets2D* getInterface(void) const

returns object interface

void initBufferFromContour(Contour2D &contour)

Sets each voxel to the signed distance to the closest vertex of a given contour

Parameters:

contour - a 2D contour corresponding to the initial level set

void buildNarrowBand()

build level set narrow band once it has been initialized

void resetNarrowBand()

reset narrow band after the level set crashes

void setTag(const char *tag)

change isocontour set graphic tag

static double getCurvatureTimesNorm(double ***src, unsigned int x, unsigned int y, unsigned int z)

compute curvature * |gradient(image)| in src image at voxel (x,y,z)

Parameters:

src - triple index array of an image buffer
x - voxel X coordinate
y - voxel Y coordinate
z - voxel Z coordinate

static double getCurvatureAndNorm(double ***src, unsigned int x, unsigned int y, unsigned int z, double &norm)

compute curvature in src image at voxel (x,y,z)

Parameters:

src - triple index array of an image buffer
x - voxel X coordinate
y - voxel Y coordinate
z - voxel Z coordinate
norm - returned norm value

static double getExternal(double ***src, unsigned int x, unsigned int y, unsigned int z, double v)

compute v * |gradient(image)| using a stable scheme

Parameters:

src - triple index array of an image buffer
x - voxel X coordinate
y - voxel Y coordinate
z - voxel Z coordinate
v - normal component value

alphabetic index hierarchy of classes

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