WlzMorphologyOps

Files
file	WlzDilation.c
	Functions for dilating objects with spatial domains.
file	WlzDistAllNearest.c
	Functions to compute nearest points in a reference domain at all points in a foreground domain.
file	WlzDistTransform.c
	Distance transform functions which calculate the distance of every pixel/voxel in a foreground object from a reference object.
file	WlzDomainNearby.c
	Functions for computing the portion of a domain which is nearby (all pixels/voxels less than a given distance from) given locations.
file	WlzErosion.c
	Morphological erosion of domain objects.
file	WlzErosion4.c
	Performs 4-connected erosion on domain objects.
file	WlzStdStructElements.c
	Standard structuring elements in 2D and 3D.
file	WlzStructDilation.c
	Performs dilation using a structuring element.
file	WlzStructErosion.c
	Performs erosion using a structuring element.

Enumerations
enum	_WlzSpecialStructElmType {   WLZ_SPEC_STRUCT_ELM_H4,   WLZ_SPEC_STRUCT_ELM_EX4,   WLZ_SPEC_STRUCT_ELM_A8,   WLZ_SPEC_STRUCT_ELM_H6,   WLZ_SPEC_STRUCT_ELM_H5,   WLZ_SPEC_STRUCT_ELM_H7,   WLZ_SPEC_STRUCT_ELM_A3,   WLZ_SPEC_STRUCT_ELM_E1,   WLZ_SPEC_STRUCT_ELM_E2,   WLZ_SPEC_STRUCT_ELM_V2 }
	Special structuring elements for morphological operations. Typedef: WlzSpecialStructElmType. More...

Functions
WlzObject *	WlzDilation (WlzObject *obj, WlzConnectType connectivity, WlzErrorNum *dstErr)
	Dilate the given object using the given connectivity type. Since the dilated object is bigger than the original, the size of the valuetable may be smaller than the dilated object. User has to take fully responsibility for using grey value of dilated object. More...
WlzCompoundArray *	WlzDistAllNearest (WlzObject *gForObj, WlzObject *gRefObj, WlzDistanceType dFn, WlzObject **dstDstObj, WlzErrorNum *dstErr)
	Computes the nearest points in a reference domain at all points in a foreground domain and (optionally) the distance of the reference domain points from their nearest points within the reference domain. The returned compound array object has integer reference point coordinates with column (x), line (y) and for 3D objects plane (z) having indices 0, 1 and 2 respectively. Distances are correct for the given distance function and are not normalised to remove over estimates with respect to constrained Euclidean distance. The intersection of the foreground and reference object is be used to ensure that the reference object is within the foreground object. More...
WlzObject *	WlzDistanceTransform (WlzObject *forObj, WlzObject *refObj, WlzDistanceType dFn, double dParam, double dMax, WlzErrorNum *dstErr)
	Computes the distance of every pixel/voxel in the foreground object from the reference object. More...
WlzObject *	WlzDomainNearby3D (WlzObject *refObj, int nPos, WlzDVertex3 *pos, WlzDistanceType dFn, double dMax, WlzErrorNum *dstErr)
	This function is just a wrapper for WlzDomainNearby(). More...
WlzObject *	WlzDomainNearby (WlzObject *refObj, int nPos, WlzVertexP pos, WlzDistanceType dFn, double dMax, WlzErrorNum *dstErr)
	Computes a new domain in which all pixels/voxels are nearby given location(s) and within the reference domain. More...
WlzObject *	WlzErosion (WlzObject *obj, WlzConnectType connectivity, WlzErrorNum *dstErr)
	Calculates the morphological erosion of a woolz object with a structuring element defined by the connectivity. More...
WlzObject *	WlzErosion4 (WlzObject *obj, WlzErrorNum *dstErr)
	4-connected erosion of a woolz domain object.2D objects only.This should not really be publicly accessible, but is present for historical reasons. Therefore the prototype does not appear in WlzProto.h. WlzErosion should be used to access 4-connected erosion. More...
WlzObject *	WlzMakeSpecialStructElement (WlzSpecialStructElmType eType, int elmIndex, WlzErrorNum *dstErr)
	Return a pointer to a specific requested "special" structuring element. These are inherited from the original woolz library with rather cryptic names. See detail for more explanation of the elements and the additional parameters. More...
WlzObject *	WlzMakeSinglePixelObject (WlzObjectType oType, int k, int l, int p, WlzErrorNum *dstErr)
	Make a single pixel/voxel object at the specified coordinate position. More...
WlzObject *	WlzMakeCircleObject (double radius, double x, double y, WlzErrorNum *dstErr)
	Generate a discretised circle domain centered at (x,y). More...
WlzObject *	WlzMakeRectangleObject (double radiusX, double radiusY, double x, double y, WlzErrorNum *dstErr)
	Generate a rectangular object centered at (x,y) with half-width radiusX and half-height radius Y. More...
WlzObject *	WlzMakeSphereObject (WlzObjectType oType, double radius, double x, double y, double z, WlzErrorNum *dstErr)
	Make a spherical domain object. More...
WlzObject *	WlzMakeCuboidObject (WlzObjectType oType, double radiusX, double radiusY, double radiusZ, double x, double y, double z, WlzErrorNum *dstErr)
	Generate a cuboid object centered at (x,y,z). More...
WlzObject *	WlzMakeQuadrilateral (double x0, double y0, double x1, double y1, double x2, double y2, double x3, double y3, WlzErrorNum *dstErr)
	Generate 2D interval domain object corresponding to the arbitrarily oriented quadrilateral with the given ordered vertex coordinates. The ordering is such that the vertices allow the rectangle to be drawn by line segments conecting v[i] to v[(i + 1)%4], with i \(\in\) [0-3]. More...
WlzObject *	WlzMakeStdStructElement (WlzObjectType oType, WlzDistanceType dType, double radius, WlzErrorNum *dstErr)
	Makes a standard structure element - basicaly a sphere but with the appropriate connectivity or distance metric. More...
WlzObject *	WlzStructDilation (WlzObject *obj, WlzObject *structElm, WlzErrorNum *dstErr)
	Dilate an object with respect to the given structuring element. This is defined as the domain obtained as the union of the SE placed at every pixel of the input domain. More...
WlzObject *	WlzStructErosion (WlzObject *obj, WlzObject *structElm, WlzErrorNum *dstErr)
	Performs erosion using a structuring element. More...

Detailed Description

Enumeration Type Documentation

_WlzSpecialStructElmType

enum _WlzSpecialStructElmType

Special structuring elements for morphological operations. Typedef: WlzSpecialStructElmType.

Enumerator
WLZ_SPEC_STRUCT_ELM_H4
WLZ_SPEC_STRUCT_ELM_EX4
WLZ_SPEC_STRUCT_ELM_A8
WLZ_SPEC_STRUCT_ELM_H6
WLZ_SPEC_STRUCT_ELM_H5
WLZ_SPEC_STRUCT_ELM_H7
WLZ_SPEC_STRUCT_ELM_A3
WLZ_SPEC_STRUCT_ELM_E1
WLZ_SPEC_STRUCT_ELM_E2
WLZ_SPEC_STRUCT_ELM_V2

Function Documentation

WlzDilation()

WlzObject* WlzDilation	(	WlzObject *	obj,
		WlzConnectType	connectivity,
		WlzErrorNum *	dstErr
	)

Dilate the given object using the given connectivity type. Since the dilated object is bigger than the original, the size of the valuetable may be smaller than the dilated object. User has to take fully responsibility for using grey value of dilated object.

Returns

Dilated object.

Parameters

obj	Given object.
connectivity	Required type of conectivity.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzObject::type, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, and WLZ_ERR_OBJECT_NULL.

Referenced by WlzDistanceTransform(), WlzHyThreshold(), WlzLabel3D(), and WlzMakeStdStructElement().

WlzDistAllNearest()

WlzCompoundArray* WlzDistAllNearest	(	WlzObject *	gForObj,
		WlzObject *	gRefObj,
		WlzDistanceType	dFn,
		WlzObject **	dstDstObj,
		WlzErrorNum *	dstErr
	)

Computes the nearest points in a reference domain at all points in a foreground domain and (optionally) the distance of the reference domain points from their nearest points within the reference domain. The returned compound array object has integer reference point coordinates with column (x), line (y) and for 3D objects plane (z) having indices 0, 1 and 2 respectively. Distances are correct for the given distance function and are not normalised to remove over estimates with respect to constrained Euclidean distance. The intersection of the foreground and reference object is be used to ensure that the reference object is within the foreground object.

Returns

A Woolz compound array object or NULL on error.

Parameters

gForObj	Given foreground object.
gRefObj	Given reference object.
dFn	Distance function which must be appropriate to the dimension of the foreground and reference objects.
dstDstObj	Destination distance object pointer for the (float) distance values, may be NULL.
dstErr	Destination error pointer, may be NULL.

References _WlzDomain::core, _WlzObject::domain, _WlzGreyV::inv, _WlzPixelV::type, _WlzObject::type, _WlzPixelV::v, WLZ_0_CONNECTED, WLZ_18_CONNECTED, WLZ_18_DISTANCE, WLZ_26_CONNECTED, WLZ_26_DISTANCE, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_4_CONNECTED, WLZ_4_DISTANCE, WLZ_6_CONNECTED, WLZ_6_DISTANCE, WLZ_8_CONNECTED, WLZ_8_DISTANCE, WLZ_COMPOUND_ARR_1, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_GREY_INT, WLZ_GREY_TAB_RAGR, WLZ_OCTAGONAL_DISTANCE, WlzGreyValueTableType(), WlzIntersect2(), WlzMakeCompoundArray(), and WlzMakeMain().

WlzDistanceTransform()

WlzObject* WlzDistanceTransform	(	WlzObject *	forObj,
		WlzObject *	refObj,
		WlzDistanceType	dFn,
		double	dParam,
		double	dMax,
		WlzErrorNum *	dstErr
	)

Computes the distance of every pixel/voxel in the foreground object from the reference object.

Returns

Distance object which shares the given foreground object's domain and has integer distance values, null on error.

A distance transform maps all position within a forground domain to their distances from a reference domain. The distance transforms implemented within this function use efficient morphological primitives.

Given two domains, \(\Omega_r\) the reference domain and \(\Omega_f\) the domain specifying the region of interest, a domain with a thin shell \(\Omega_i\) is iteratively expanded from it's initial domain corresponding to the reference domain \(\Omega_r\). At each iteration \(\Omega_i\) is dilated and clipped by it's intersection with \(\Omega_f\) until \(\Omega_i\) becomes the null domain \(\emptyset\). At each iteration the current distance is recorded in a value table which covers the domain \(\Omega_f\).

An octagonal distance scheme may be used in which the distance metric is alternated between 4 and 8 connected for 2D and 6 and 26 connectivities in 3D. See: G. Borgefors. "Distance Transformations in Arbitrary Dimensions" CVGIP 27:321-345, 1984.

    An approximate Euclidean distance transform may be computed
    by: Scaling the given foreground and reference objects using
    the given approximation scale parameter, dilating the
    reference domain using a sphere with a radius having the same
    value as the scale parameter and then finaly sampling the
    scaled distances.

Parameters

forObj	Foreground object.
refObj	Reference object.
dFn	Distance function which must be appropriate to the dimension of the foreground and reference objects.
dParam	Parameter required for distance function. Currently only WLZ_APX_EUCLIDEAN_DISTANCE requires a parameter. In this case the parameter is the approximation scale.
dMax	Maximum distance before itteration stops, <= 0 implies an infinite maximum distance.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzDomain::core, _WlzGreyV::dbv, _WlzObject::domain, _WlzPlaneDomain::domains, _WlzGreyV::inv, _WlzDomain::p, _WlzDomain::pts, _WlzPixelV::type, _WlzObject::type, _WlzPixelV::v, _WlzValues::v, _WlzVoxelValues::values, _WlzValues::vox, WLZ_0_CONNECTED, WLZ_18_CONNECTED, WLZ_18_DISTANCE, WLZ_26_CONNECTED, WLZ_26_DISTANCE, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_4_CONNECTED, WLZ_4_DISTANCE, WLZ_6_CONNECTED, WLZ_6_DISTANCE, WLZ_8_CONNECTED, WLZ_8_DISTANCE, WLZ_APX_EUCLIDEAN_DISTANCE, WLZ_ERR_CONNECTIVITY_TYPE, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_ERR_UNIMPLEMENTED, WLZ_EUCLIDEAN_DISTANCE, WLZ_GREY_DOUBLE, WLZ_GREY_INT, WLZ_GREY_TAB_RAGR, WLZ_INTERPOLATION_NEAREST, WLZ_OCTAGONAL_DISTANCE, WLZ_POINTS, WLZ_TRANSFORM_2D_AFFINE, WLZ_TRANSFORM_3D_AFFINE, WLZ_VOXELVALUETABLE_GREY, WlzAffineTransformFromScale(), WlzAffineTransformObj(), WlzAssignObject(), WlzAssignValues(), WlzDiffDomain(), WlzDilation(), WlzFreeAffineTransform(), WlzFreeObj(), WlzGreySetValue(), WlzGreyValueTableType(), WlzIntersect2(), WlzIntersectN(), WlzIsEmpty(), WlzMakeMain(), WlzMakeSphereObject(), WlzMakeVoxelValueTb(), WlzNewValuesVox(), WlzNewValueTb(), WlzPointsToDomObj(), and WlzStructDilation().

Referenced by WlzDomainNearby(), WlzLineSkeleton(), WlzLineSkeletonSegment(), and WlzOffsetDist().

WlzDomainNearby3D()

WlzObject* WlzDomainNearby3D	(	WlzObject *	refObj,
		int	nPos,
		WlzDVertex3 *	pos,
		WlzDistanceType	dFn,
		double	dMax,
		WlzErrorNum *	dstErr
	)

This function is just a wrapper for WlzDomainNearby().

Returns

A new domain in which all pixels/voxels are nearby the given location(s). The object returned will either be of the same type as the reference object or an empty object if (all) the given location(s) are outside of the reference object's domain. On error a NULL pointer will be returned.

Parameters

refObj	Reference object which must be of type WLZ_EMPTY_OBJ or WLZ_3D_DOMAINOBJ.
nPos	Number of locations.
pos	3D locations.
dFn	The connectivity to use when establishing distance. This must be one of: WLZ_OCTAGONAL_DISTANCE WLZ_4_DISTANCE WLZ_6_DISTANCE WLZ_8_DISTANCE WLZ_18_DISTANCE WLZ_26_DISTANCE Distances must be appropriate for the given object type although all are acceptable for an empty object.
dMax	Maximum distance for a pixel/voxel to be considered nearby.
dstErr	Destination error pointer, may be NULL.

References _WlzVertexP::d3, and WlzDomainNearby().

WlzDomainNearby()

WlzObject* WlzDomainNearby	(	WlzObject *	refObj,
		int	nPos,
		WlzVertexP	pos,
		WlzDistanceType	dFn,
		double	dMax,
		WlzErrorNum *	dstErr
	)

Computes a new domain in which all pixels/voxels are nearby given location(s) and within the reference domain.

Returns

A new domain in which all pixels/voxels are nearby the given location(s). The object returned will either be of the same type as the reference object or an empty object if (all) the given location(s) are outside of the reference object's domain. On error a NULL pointer will be returned.

Parameters

refObj	Reference object which must be of type WLZ_EMPTY_OBJ, WLZ_2D_DOMAINOBJ or WLZ_3D_DOMAINOBJ.
nPos	Number of locations.
pos	Locations which are either of type WlzDVertex2 if the given object is of type WLZ_2D_DOMAINOBJ or WlzDVertex3 if the given object is of type WLZ_3D_DOMAINOBJ.
dFn	The connectivity to use when establishing distance. This must be one of: WLZ_OCTAGONAL_DISTANCE WLZ_4_DISTANCE WLZ_6_DISTANCE WLZ_8_DISTANCE WLZ_18_DISTANCE WLZ_26_DISTANCE Distances must be appropriate for the given object type although all are acceptable for an empty object.
dMax	Maximum distance for a pixel/voxel to be considered nearby.
dstErr	Destination error pointer, may be NULL.

References AlcCalloc(), AlcFree(), _WlzDomain::core, _WlzVertexP::d2, _WlzVertexP::d3, _WlzObject::domain, _WlzDomain::i, _WlzGreyV::inv, _WlzDomain::p, _WlzPixelV::type, _WlzObject::type, _WlzPixelV::v, _WlzIVertex3::vtX, _WlzIVertex3::vtY, _WlzIVertex3::vtZ, WLZ_18_DISTANCE, WLZ_26_DISTANCE, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_4_DISTANCE, WLZ_6_DISTANCE, WLZ_8_DISTANCE, WLZ_EMPTY_OBJ, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_GREY_INT, WLZ_OCTAGONAL_DISTANCE, WLZ_THRESH_HIGH, WLZ_VTX_2_NINT, WLZ_VTX_3_NINT, WLZ_VTX_3_ZERO, WlzAssignObject(), WlzDistanceTransform(), WlzFreeObj(), WlzInsideDomain2D(), WlzInsideDomain3D(), WlzMakeEmpty(), WlzMakeSinglePixelObject(), WlzThreshold(), WlzUnion2(), and WlzUnionN().

Referenced by WlzDomainNearby3D().

WlzErosion()

WlzObject* WlzErosion	(	WlzObject *	obj,
		WlzConnectType	connectivity,
		WlzErrorNum *	dstErr
	)

Calculates the morphological erosion of a woolz object with a structuring element defined by the connectivity.

Returns

Eroded object or without values or NULL on error.

Parameters

obj	Object to be eroded, must be a 2D or 3D domain object (including a WlzTransObj).
connectivity	Type of connectivity.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzObject::type, WLZ_18_CONNECTED, WLZ_26_CONNECTED, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_4_CONNECTED, WLZ_6_CONNECTED, WLZ_8_CONNECTED, WLZ_ERR_CONNECTIVITY_TYPE, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, and WlzErosion4().

Referenced by WlzBasisFnTransformRandom(), WlzBoundaryDomain(), WlzBoundToObj(), WlzLBTDomain2DFromIDomain(), WlzLBTDomain3DFromPDomain(), and WlzVerticesFromObjBnd3I().

WlzErosion4()

WlzObject* WlzErosion4	(	WlzObject *	obj,
		WlzErrorNum *	dstErr
	)

4-connected erosion of a woolz domain object.2D objects only.This should not really be publicly accessible, but is present for historical reasons. Therefore the prototype does not appear in WlzProto.h. WlzErosion should be used to access 4-connected erosion.

Returns

Eroded object.

Parameters

obj	Input object.
dstErr	Error return.

Source:

WlzErosion4.c

References AlcFreeStackPush(), AlcMalloc(), _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzIntervalDomain::freeptr, _WlzDomain::i, _WlzIntervalDomain::intvlines, _WlzIntervalDomain::kol1, _WlzIntervalDomain::lastkl, _WlzIntervalDomain::lastln, _WlzIntervalDomain::line1, _WlzObject::type, _WlzIntervalDomain::type, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_EMPTY_OBJ, WLZ_ERR_DOMAIN_DATA, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_DOMAIN_TYPE, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_INTERVALDOMAIN_INTVL, WLZ_INTERVALDOMAIN_RECT, WLZ_TRANS_OBJ, WlzIDomMaxItvLn(), WlzIntervalCount(), WlzMakeEmpty(), WlzMakeIntervalDomain(), and WlzMakeMain().

Referenced by WlzErosion().

WlzMakeSpecialStructElement()

WlzObject* WlzMakeSpecialStructElement	(	WlzSpecialStructElmType	eType,
		int	elmIndex,
		WlzErrorNum *	dstErr
	)

Return a pointer to a specific requested "special" structuring element. These are inherited from the original woolz library with rather cryptic names. See detail for more explanation of the elements and the additional parameters.

Returns

Structuring element object pointer.

Special element types:

WLZ_SPEC_STRUCT_ELM_H4	2D SE, origin - centre:	0 1 0 1 1 1 0 1 0
WLZ_SPEC_STRUCT_ELM_EX4	2D SE, origin - centre:	1 1 1 0 1 0 1 1 1
WLZ_SPEC_STRUCT_ELM_A8	2D SE, origin - centre:	1 1 1 1 1 1 1 1 1
WLZ_SPEC_STRUCT_ELM_H6 elmIndex = 0,1,2	2D SE, origin - centre:	0 1 1 1 1 1 1 1 0	1 1 0 1 1 1 0 1 1	1 1 1 1 1 1 0 1 0
WLZ_SPEC_STRUCT_ELM_H6 elmIndex = 3,4,5	2D SE, origin - centre:	1 1 0 1 1 1 1 1 0	0 1 0 1 1 1 1 1 1	0 1 1 1 1 1 0 1 1
WLZ_SPEC_STRUCT_ELM_H5 elmIndex = 0,1,2,3	2D SE, origin - centre:	0 1 0 1 1 1 1 1 0	0 1 0 1 1 1 0 1 1	0 1 1 1 1 1 0 1 0	1 1 0 1 1 1 0 1 0
WLZ_SPEC_STRUCT_ELM_H7 elmIndex = 0,1,2,3	2D SE, origin - centre:	1 1 1 1 1 1 0 1 1	1 1 1 1 1 1 1 1 0	1 1 0 1 1 1 1 1 1	0 1 1 1 1 1 1 1 1
WLZ_SPEC_STRUCT_ELM_A3 elmIndex = 0,1,2,3	2D SE, origin - centre:	0 0 0 1 1 1 0 1 0	0 1 0 0 1 1 0 1 0	0 1 0 1 1 1 0 0 0	0 1 0 1 1 0 0 1 0
WLZ_SPEC_STRUCT_ELM_E1	2D SE, origin - left:/td>	1 1
WLZ_SPEC_STRUCT_ELM_E2	2D SE, origin - centre:	1 1 1
WLZ_SPEC_STRUCT_ELM_V2	2D SE, origin - centre:	1 1 1

Parameters

eType	Enumerated type of the requested special element.
elmIndex	Additional parameter for a particular element if required (see details).
dstErr	Destination error pointer, may be NULL.

References WLZ_ERR_NONE, and WLZ_SPEC_STRUCT_ELM_H4.

WlzMakeSinglePixelObject()

WlzObject* WlzMakeSinglePixelObject	(	WlzObjectType	oType,
		int	k,
		int	l,
		int	p,
		WlzErrorNum *	dstErr
	)

Make a single pixel/voxel object at the specified coordinate position.

Returns

Single pixel object with coordinates (k,l,p).

Parameters

oType	Object type - WLZ_2D_DOMAINOBJ or WLZ_3D_DOMAINOBJ.
k	Column (x) coordinate.
l	Line (y) coordinate.
p	Plane (z) coordinate.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, and WLZ_ERR_NONE.

Referenced by WlzDomainNearby(), WlzLineSkeleton(), WlzLineSkeletonSegment(), WlzMakeCircleObject(), WlzMakeMarkers(), WlzMakeQuadrilateral(), WlzMakeRectangleObject(), WlzMakeStdStructElement(), and WlzPointsToDomObj().

WlzMakeCircleObject()

WlzObject* WlzMakeCircleObject	(	double	radius,
		double	x,
		double	y,
		WlzErrorNum *	dstErr
	)

Generate a discretised circle domain centered at (x,y).

Returns

Object with circular domain.

Parameters

radius	Circle radius.
x	Column/x coordinate of the circle centre.
y	Row/y coordinate of the circle centre.
dstErr	Destination error pointer, may be NULL.

References AlcCalloc(), AlcFreeStackPush(), _WlzValues::core, _WlzIntervalDomain::freeptr, _WlzDomain::i, WLZ_2D_DOMAINOBJ, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_INTERVALDOMAIN_INTVL, WLZ_NINT, WlzFreeIntervalDomain(), WlzMakeInterval(), WlzMakeIntervalDomain(), WlzMakeMain(), WlzMakeSinglePixelObject(), and WlzStandardIntervalDomain().

Referenced by WlzCMeshFromObj2D(), and WlzMakeSphereObject().

WlzMakeRectangleObject()

WlzObject* WlzMakeRectangleObject	(	double	radiusX,
		double	radiusY,
		double	x,
		double	y,
		WlzErrorNum *	dstErr
	)

Generate a rectangular object centered at (x,y) with half-width radiusX and half-height radius Y.

Returns

Rectangular object

Parameters

radiusX	Column half-width of rectangle
radiusY	Line (y) half-width of rectangle
x	Column (x) rectangle centre.
y	Line (y) rectangle centre.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzDomain::i, WLZ_2D_DOMAINOBJ, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_INTERVALDOMAIN_RECT, WLZ_NINT, WlzMakeIntervalDomain(), WlzMakeMain(), and WlzMakeSinglePixelObject().

Referenced by WlzCMeshFromObj2D(), WlzMakeCuboidObject(), WlzMakeTiledValuesObj2D(), and WlzPointsFromDomObj().

WlzMakeSphereObject()

WlzObject* WlzMakeSphereObject	(	WlzObjectType	oType,
		double	radius,
		double	x,
		double	y,
		double	z,
		WlzErrorNum *	dstErr
	)

Make a spherical domain object.

Returns

Sphere object

Parameters

oType	Object type - make a circle if 2D.
radius	Sphere radius
x	Column (x) centre.
y	Line (y) centre.
z	Plane (x) centre.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzObject::domain, _WlzPlaneDomain::domains, _WlzDomain::p, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_ERR_NONE, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_NINT, WLZ_PLANEDOMAIN_DOMAIN, WlzAssignDomain(), WlzFreeObj(), WlzFreePlaneDomain(), WlzMakeCircleObject(), WlzMakeMain(), WlzMakePlaneDomain(), and WlzStandardPlaneDomain().

Referenced by WlzConComThreshold(), WlzContourRBFBndObj3D(), WlzDistanceTransform(), WlzMakeMarkers(), WlzMakeStdStructElement(), WlzOffsetDist(), and WlzPointsToDomObj().

WlzMakeCuboidObject()

WlzObject* WlzMakeCuboidObject	(	WlzObjectType	oType,
		double	radiusX,
		double	radiusY,
		double	radiusZ,
		double	x,
		double	y,
		double	z,
		WlzErrorNum *	dstErr
	)

Generate a cuboid object centered at (x,y,z).

Returns

Cuboid domain object

Parameters

oType	Object type use WlzMakerectangleObject() if 2D.
radiusX	Cuboid half-width (x)
radiusY	Cuboid half-height (y).
radiusZ	Cuboid half-depth (z).
x	Column (x) centre.
y	Line (y) centre.
z	Plane (z) centre.
dstErr	Destination error pointer, may be NULL.

References _WlzValues::core, _WlzObject::domain, _WlzPlaneDomain::domains, _WlzDomain::p, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_ERR_NONE, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_PARAM_DATA, WLZ_NINT, WLZ_PLANEDOMAIN_DOMAIN, WlzAssignDomain(), WlzFreeObj(), WlzFreePlaneDomain(), WlzMakeMain(), WlzMakePlaneDomain(), WlzMakeRectangleObject(), and WlzStandardPlaneDomain().

Referenced by WlzCMeshFromObj3D(), WlzMakeTiledValuesObj3D(), and WlzPointsFromDomObj().

WlzMakeQuadrilateral()

WlzObject* WlzMakeQuadrilateral	(	double	x0,
		double	y0,
		double	x1,
		double	y1,
		double	x2,
		double	y2,
		double	x3,
		double	y3,
		WlzErrorNum *	dstErr
	)

Generate 2D interval domain object corresponding to the arbitrarily oriented quadrilateral with the given ordered vertex coordinates. The ordering is such that the vertices allow the rectangle to be drawn by line segments conecting v[i] to v[(i + 1)%4], with i \(\in\) [0-3].

Returns

Object with quadrilateral domain.

Parameters

x0	Column coordinate of the first vertex.
y0	Row coordinate of the first vertex.
x1	Column coordinate of the second vertex.
y1	Row coordinate of the second vertex.
x2	Column coordinate of the third vertex.
y2	Row coordinate of the third vertex.
x3	Column coordinate of the forth vertex.
y3	Row coordinate of the forth vertex.
dstErr	Destination error pointer, may be NULL.

References AlcCalloc(), AlcFreeStackPush(), _WlzValues::core, _WlzIntervalDomain::freeptr, _WlzDomain::i, _WlzInterval::ileft, _WlzInterval::iright, _WlzIVertex2::vtX, _WlzIVertex2::vtY, WLZ_2D_DOMAINOBJ, WLZ_ERR_MEM_ALLOC, WLZ_ERR_NONE, WLZ_INTERVALDOMAIN_INTVL, WlzFreeDomain(), WlzMakeInterval(), WlzMakeIntervalDomain(), WlzMakeMain(), WlzMakeSinglePixelObject(), WlzRasterLineSetItv2D(), _WlzIBox2::xMax, _WlzIBox2::xMin, _WlzIBox2::yMax, and _WlzIBox2::yMin.

WlzMakeStdStructElement()

WlzObject* WlzMakeStdStructElement	(	WlzObjectType	oType,
		WlzDistanceType	dType,
		double	radius,
		WlzErrorNum *	dstErr
	)

Makes a standard structure element - basicaly a sphere but with the appropriate connectivity or distance metric.

Returns

Parameters

oType	Object type - WLZ_2D_DOMAINOBJ or WLZ_3D_DOMAINOBJ.
dType	Distance metric.
radius	Sphere radius.
dstErr	Destination error pointer, may be NULL.

References WLZ_18_DISTANCE, WLZ_26_DISTANCE, WLZ_4_CONNECTED, WLZ_4_DISTANCE, WLZ_6_DISTANCE, WLZ_8_CONNECTED, WLZ_8_DISTANCE, WLZ_ERR_NONE, WLZ_ERR_PARAM_DATA, WLZ_ERR_PARAM_TYPE, WLZ_EUCLIDEAN_DISTANCE, WLZ_NINT, WLZ_OCTAGONAL_DISTANCE, WlzDilation(), WlzFreeObj(), WlzMakeEmpty(), WlzMakeSinglePixelObject(), and WlzMakeSphereObject().

WlzStructDilation()

WlzObject* WlzStructDilation	(	WlzObject *	obj,
		WlzObject *	structElm,
		WlzErrorNum *	dstErr
	)

Dilate an object with respect to the given structuring element. This is defined as the domain obtained as the union of the SE placed at every pixel of the input domain.

Returns

Dilated domain object.

Parameters

obj	Input object to be dilated
structElm	Structuring element.
dstErr	Error return.

Source:

WlzStructDilation.c

References _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzDomain::i, _WlzObject::type, _WlzIntervalDomain::type, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_EMPTY_DOMAIN, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, and WlzMakeEmpty().

Referenced by WlzCMeshFromObj2D(), WlzCMeshFromObj3D(), WlzContourRBFBndObj3D(), WlzDistanceTransform(), WlzMakeTiledValuesObj2D(), WlzMakeTiledValuesObj3D(), and WlzOffsetDist().

WlzStructErosion()

WlzObject* WlzStructErosion	(	WlzObject *	obj,
		WlzObject *	structElm,
		WlzErrorNum *	dstErr
	)

Performs erosion using a structuring element.

Returns

New object or NULL on error.

Parameters

obj	Given object to be eroded.
structElm	Structuring element.
dstErr	Destination error pointer, may be NULL.

References _WlzDomain::core, _WlzObject::domain, _WlzDomain::i, _WlzObject::type, _WlzIntervalDomain::type, WLZ_2D_DOMAINOBJ, WLZ_3D_DOMAINOBJ, WLZ_EMPTY_DOMAIN, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, and WlzMakeEmpty().

Referenced by WlzContourRBFBndObj3D(), and WlzPointsFromDomObj().