WlzSeqPar.c File Reference

Performs sequential or local transformation of an object. Jim Piper derived the original seqpar.c from Fortran code by Marshall Presser. More...

Functions
WlzObject *	WlzSeqPar (WlzObject *srcObj, int newObjFlag, int sequentialFlag, WlzRasterDir rasterDir, int bdrSz, int bkgVal, void *transformData, int(*transformFn)(WlzSeqParWSpace *, void *), WlzErrorNum *dstErr)
	WlzSeqPar performs a sequential or parallel local transform. A distance transform is an example of a sequential transform and a laplacian is an example of a parallel transform. Only WLZ_2D_DOMAINOBJ objects with values may be passed to WlzSeqPar(). More...

Detailed Description

Performs sequential or local transformation of an object. Jim Piper derived the original seqpar.c from Fortran code by Marshall Presser.

Author

Jim Piper, Bill Hill

Date

March 1999

Version

Id

55eb8508c6b7e79757173c650bff93281938a0c2

Address: MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Edinburgh, EH4 2XU, UK.

Copyright (C), [2012], The University Court of the University of Edinburgh, Old College, Edinburgh, UK.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Function Documentation

WlzSeqPar()

WlzObject* WlzSeqPar	(	WlzObject *	srcObj,
		int	newObjFlag,
		int	sequentialFlag,
		WlzRasterDir	rasterDir,
		int	bdrSz,
		int	bkgVal,
		void *	transformData,
		int(*)(WlzSeqParWSpace *, void *)	transformFn,
		WlzErrorNum *	dstErr
	)

WlzSeqPar performs a sequential or parallel local transform. A distance transform is an example of a sequential transform and a laplacian is an example of a parallel transform. Only WLZ_2D_DOMAINOBJ objects with values may be passed to WlzSeqPar().

Returns

The filtered object, maybe NULL on error.

Note

If the point to be transformed is at line l and col k, there is an array of pointers spWSpace->adrptr[-7:7], whose i'th entry gives the address of the point (l + (i * spWSpace->ldelta), k), but which is only meaningful for lines within bdrSz of the point. For example: spWSpace->adrptr[-3] and spWSpace->adrptr[3] are undefined if bdrSz < 3.

Parameters

srcObj	The given WLZ_2D_DOMAINOBJ object.
newObjFlag	If zero then the given object is overwritten otherwise a new object is created.
sequentialFlag	If non zero the transform is seqential and transformed values are used in calculating the neighbouring values. If zero the transform always works on the original grey values.
rasterDir	Direction of raster scan.
bdrSz	Local transform kernel half-size, must be in range 0 - 7. The usual 8 immediate neighbors correspond to bdrSz == 1.
bkgVal	Background grey value.
transformData	Data supplied to the transform function.
transformFn	Supplied transform function.
dstErr	Destination error pointer, may be NULL.

References _WlzSeqParWSpace::adrptr, AlcCalloc(), _WlzSeqParWSpace::brdrsz, _WlzValues::core, _WlzDomain::core, _WlzObject::domain, _WlzGreyWSpace::gvio, _WlzDomain::i, _WlzSeqParWSpace::kdelta, _WlzIntervalDomain::kol1, _WlzIntervalDomain::lastkl, _WlzIntervalDomain::lastln, _WlzSeqParWSpace::ldelta, _WlzIntervalWSpace::lftpos, _WlzIntervalDomain::line1, _WlzIntervalWSpace::linpos, _WlzIntervalWSpace::rgtpos, _WlzObject::type, _WlzCoreValues::type, _WlzObject::values, WLZ_2D_DOMAINOBJ, WLZ_DBG, WLZ_DBG_LVL_1, WLZ_DBG_LVL_3, WLZ_DBG_LVL_FN, WLZ_ERR_DOMAIN_DATA, WLZ_ERR_DOMAIN_NULL, WLZ_ERR_NONE, WLZ_ERR_OBJECT_NULL, WLZ_ERR_OBJECT_TYPE, WLZ_ERR_VALUES_NULL, WLZ_ERR_VALUES_TYPE, WLZ_RASTERDIR_DLDC, WLZ_RASTERDIR_DLIC, WLZ_RASTERDIR_ILDC, WLZ_RASTERDIR_ILIC, WlzGreyTableIsTiled(), WlzInitGreyRasterScan(), WlzNewGrey(), WlzNextGreyInterval(), and WlzNextInterval().

Referenced by WlzConvolveObj(), WlzGreyCrossing(), and WlzGreyVariance().