Woolz Image Processing  Version 1.8.3
WlzGreyCrossing.c File Reference

Computes a domain object with grey values in which the values encode the direction at each pixel of a grey value transition. If the given grey value is zero then this is the zero crossing direction. More...

Functions

int WlzGreyCrossingSeqParFn (WlzSeqParWSpace *spWSpace, void *spData)
 Tests for a grey value crossing using a 3x3 kernel. This function is called by WlzSeqPar(). Given an integer kernel about a given pixel (E): More...
 
WlzObjectWlzGreyCrossing (WlzObject *inObj, int newObjFlag, int cVal, WlzErrorNum *dstErr)
 Uses a 3X3 kernel to examine the given object for transitions (grey value crossings) about the given grey value. Only objects with WLZ_EMPTY_OBJ and WLZ_2D_DOMAINOBJ types are valid. WLZ_2D_DOMAINOBJ objects must have a valid domain and integral (ie WLZ_GREY_INT, WLZ_GREY_SHORT or WLZ_GREY_UBYTE) values. More...
 

Detailed Description

Computes a domain object with grey values in which the values encode the direction at each pixel of a grey value transition. If the given grey value is zero then this is the zero crossing direction.

Author
Bill Hill
Date
March 1999
Version
Id
3fea1b20961ed0dfd520332c679d148bf245bc1f
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.

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