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HxWatershed.h File Reference

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#include "HxImageRep.h"

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Functions
HxImageRep L_HXIMAGEREP	HxWatershed (HxImageRep input, int conn)
	Watershed function creates the result image by detecting the domain of the catchment basins of "im" using the "flooding definition", according to the connectivity defined by "sf". More...

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Detailed Description

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Function Documentation

HxImageRep L_HXIMAGEREP HxWatershed (  HxImageRep    input, int    conn )

Watershed function creates the result image by detecting the domain of the catchment basins of "im" using the "flooding definition", according to the connectivity defined by "sf". According to the flag "linereg" the result image will be a labeled image of the catchment basins domain or just a binary image that presents the watershed lines. Implementation based on Vincent algorithm (PAMI) Evaluation using SDC Matlab toolbox (www.morph.com) im is the input image (HxImageRep) mark is the marker image (HxImageRep) sf is the structuring function; default type is crossSF (HxSF) linereg HxString. Possible values 'LINES' or ' REGIONS'. Default: "LINES". Returns: the watershed Image, ImageRep * references: L. Vincent and P. Soille, Watersheds in digital spaces: an efficient algorithm based on immersion simulations, IEEE Transactions on Pattern Analysis and Machine Intelligence. 13:583-598, 1991. Remarks: this queue based implementation is based on sorted lists of pixels for color images there is no partial ordering therefore we cannot use this for color { HxTagList tags; HxAddTag(tags, "connectivity", conn); HxImageRep mask=input; //to speedup compute here the min and max gray values int hmin,hmax; hmin = HxPixMin(input).HxScalarIntValue().x(); hmax = HxPixMax(input).HxScalarIntValue().x(); HxAddTag(tags,"hmin",hmin); HxAddTag(tags,"hmax",hmax); //for more speedup, use a histogram to indicate the existing gray levels HxImageRep out = input.queueBasedOp(mask, "qWaterShedLV", tags); //because the LucVincent algorithm doesn't get all the watershed points //this neigborhoud operator replaces the smallest label with wshed value HxAddTag(tags, "conn", conn); HxAddTag(tags, "wshedval", WSHEDVAL); out = out.neighbourhoodOp("lwshed", tags); return out; }

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