No subject

introduces  water  sheds  as soon as the pools would flood another. I want the
watershed filter to stop flooding those pools at that point and just keep  the
so far labeld ragion in which only one definit minimum exists.

Is  it  possible  to  introduce  this flood-stop-condition into the water shed
filter?
Or can the same result be achieved with the fill holes filter as  I  discribed
in my previous mail?

Many thanks for any help or hints about this.
Lynx



> 
> It sounds like you are trying to label darker regions. A standard
> morphological watershed (in review section of ITK, otherwise on IJ)
> will do this. Watershed labels don't overlap, due to the method of
> construction. However if you simply apply the watershed to the raw
> image then you'll get a label for each minima, including all the
> noise. Usually you'll want to do some preprocessing to reduce the
> number of minima or find markers somewhere in the basins that you're
> actually interested in. If you can reliably find such markers then you
> can use a marker based watershed, which will only produce as many
> labels as you have markers.
> 
> On Wed, Feb 17, 2010 at 12:45 AM,  <lynx.abraxas at freenet.de> wrote:
> > Hello!
> >
> >
> > I'm  looking  for  a  filter  who's result is that of a water shed filter that
> > would stop filling basins as soon as a water shed  would  be  introduced.  The
> > result  would  be  a  label  for each marker (eg. local minimum) but the label
> > would only be as big as the "natural" basin. So the  labels  would  only  just
> > touch each other.
> > From  the  description  of the fill-holes-filter I'm not sure if that is doing
> > what I'm looking for. I tried:
> > HMinimaImageFilter(float-image)
> > GrayscaleFillholeImageFilterr(Hminima-result)
> > SubtractImageFilter(Hminima-result,fillholes-result)
> > BinaryThresholdImageFilter(Substract-result) #bg==0 fg everything except 0
> > ConnectedComponentImageFilter(threshold-result)
> >
> > But the result is not as expected.
> > For one I wonder how I can achieve a threshold as fg is everything except 0.
> > Second the subtraction does not yield 0 any where. Why that? Is this a rouding
> > error problem?
> >
> > Is there a better way to achieve this goal?
> >
> > Many thanks for any help or hints
> > Lynx
> >