> Hi,
>
> On Jun 23, 2013, at 3:11 PM, Sidnei Paciornik wrote:
>
> > Hi Jan,
> >
> > Thanks again for the hints, which I did test.
> >
> > I guess the main drawaback is that these approaches tend to increase high
> > frequency and contrast everywhere, not only at edges. They give me part
> of
> > the improvemente I wanted, but also increasing noise within objects.
> >
> > Let us see if some other colleague can add to the discussion.
>
>
> Can you post a small example in a public place so we can see what you are
> describing?
>
> Thanks,
> Ben
>
> >
> > Thank you!
> >
> > Sidnei
> >
> >
> > On Sun, Jun 23, 2013 at 5:25 AM, BioVoxxel <
[hidden email]>
> wrote:
> >
> >> Hi Sidnei,
> >>
> >> I am not sure if this will be a solution you are looking for, but have
> you
> >> considered unsharp masking (>Process > Filters > Unsharp Mask...).
> >> Another possibility might be the "Contrast Detection from the BioVoxxel
> >> Toolbox if you tick the option "enhance edges in original". This method
> >> applied grayscale erosion and dilation to enhance edges and thereny
> might
> >> lead to stronger edge enhancement than the unsharp mask but can also
> induce
> >> artifacts if overdone.
> >>
> >> kind regards,
> >> Jan
> >>
> >>
> >> 2013/6/22 Sidnei Paciornik <
[hidden email]>
> >>
> >>> Hi Jan
> >>> I guess this is not quite the answer. I don't need edge detection, but
> >>> edge enhancement. I couldn't figure how either of your hints would do
> it.
> >>> The algorithm should be simple. Take a neighborhood, calculate min,
> max,
> >>> and range R.
> >>> Pick a threshold T.
> >>> If T>R it is not an edge, keep input pixel.
> >>> Else exchange pixel with max or min.
> >>>
> >>> I just don't know how to program it.
> >>> Any other hints?
> >>> Thank you.
> >>> Em 22/06/2013 04:24, "Jan Brocher - BioVoxxel" <
>
[hidden email]>
> >>> escreveu:
> >>>
> >>>> Hi Sidnei,
> >>>>
> >>>> There is a plugin called Image Edges from Thomas Boudier (I think it
> is
> >>>> not included in Fiji by default but available on the following site:
> >>>>
>
http://imagejdocu.tudor.lu/doku.php?id=plugin:filter:edge_detection:start> >>>> ).
> >>>> Another possibility would be the "Edges" in FeatureJ from Eric
> Meijering
> >>>> which enables you to suppress "halo" effects. To my knowledge both
> plugins
> >>>> apply Canny edge detection based algorithms.
> >>>>
> >>>> regards,
> >>>> Jan
> >>>>
> >>>>
> >>
> >>
> >> --
> >>
> >> CEO: Dr. rer. nat. Jan Brocher
> >> phone: +49 (0)6234 917 03 39
> >> mobile: +49 (0)176 705 746 81
> >> e-mail:
[hidden email]
> >> info:
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> >> inquiries:
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> >> web: www.biovoxxel.de
> >>
> >
> > --
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