Dear all,
Let me revive this old thread. After a few long session with watershed
grain analysis in last few days i have more or less the same set of
questions and doubts as Daria had. Unfortunately information on watershed
options in user giude is still brief and kind of enigmatic as it has been
for a long time. Probably Petr didn't find time to update the manual. Sorry
about this, but i would like to kindly ask you to explain used algorithm
and watershed parameters in Gwyddion.
Thank you and best regards,
Kostia
On Tue, May 14, 2013 at 10:10 PM, Petr Klapetek <[email protected]> wrote:
>
> Dear all,
>
> tomorrow I will try to explain the algorithm parameters more in detail
> in the user guide,
> sorry that I hadn't time for that up to now.
>
> Best regards,
> Petr
>
>
> On Mon, May 13, 2013 at 9:50 PM, D.Yu.Khanukaeva <[email protected]> wrote:
>
> Dear colleagues,
>
> my questions are rather simple and I hope, someone will answer. I looked
> through the forum archive and found analogous post about the meaning of the
> watershed options. There David recommended reading manual in reply. I've
> read manual several times, but misunderstanding remains.
> The only option which is clear for me is the Threshold - it cuts the noise
> on the chosen level.
> More or less Drop size parameter understandable - the higher its value,
> the larger lakes on the image. But it is measured in percents. What are
> these percents of?
> Variations of Number of steps in Segmentation section also result in the
> sizes of the lakes. So I've concluded, that it is the amount of drops put
> in each chosen grain.
> At last, Number of steps in Grain location section gives the most
> unexpected results for me, that indicates my absolute misunderstanding of
> its meaning. If the initial drops are located at every point of the image,
> why do large unmasked regions appear, when this parameter is high? If this
> is the length of each drop path, the result again is very strange: the
> drops not always concentrate in the regions which are obvious extremums of
> the image, so, some grains remain unmasked...
>
> I specially wrote my reasoning in hope somebody at least comments my
> words, if nobody has time for detailed explanations.
> Thank you!
>
> Daria Khanukaeva,
> Gubkin Russian State University of Oil and Gas,
> Department of Higher Mathematics.
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