get mouse feedback within plug-in?

[haenselmann]

Dear all,

recently, I implemented an alpha-matting algorithm for image
segmentation and I feel that it works pretty well so I wanted to write
a gimp plug-in. Here is a little homepage for the project:

http://www.informatik.uni-mannheim.de/pi4/projects/image_matting/

The current application needs interactive user-input with the
mouse. So far I have not found out how gimp could inform a plug-in
about mouse-movements (like the current cursor position) in a
drawable. Is a plug-in generally suitable for the task or how could I
implement such a tool? (I read the little tutorial on
developer.gimp.org. More how-tos would be welcome as well.)

Thanks in advance,

   Thomas

--
Thomas Haenselmann @ University of Mannheim
phone [phone] (voice -2603) (fax -2601)


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[Torsten Neuer]

Hi,

> The current application needs interactive user-input with the
> mouse. So far I have not found out how gimp could inform a plug-in
> about mouse-movements (like the current cursor position) in a
> drawable. Is a plug-in generally suitable for the task or how could I
> implement such a tool? (I read the little tutorial on
> developer.gimp.org. More how-tos would be welcome as well.)

From what you write and what it looks like on your project page, you should
probably write a tool instead of a plugin (you may find fitting examples
under gimp-2.4.5/app/tools).  Also, you could then use any brush available to
the Gimp.


  Torsten


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On Friday 11 April 2008, Torsten Neuer wrote:

> Hi,
>
> > The current application needs interactive user-input with the
> > mouse. So far I have not found out how gimp could inform a plug-in
> > about mouse-movements (like the current cursor position) in a
> > drawable. Is a plug-in generally suitable for the task or how could I
> > implement such a tool? (I read the little tutorial on
> > developer.gimp.org. More how-tos would be welcome as well.)
>
> From what you write and what it looks like on your project page, you should
> probably write a tool instead of a plugin (you may find fitting examples
> under gimp-2.4.5/app/tools).  Also, you could then use any brush available
> to the Gimp.
>
>
>   Torsten

Just have a look at the current foreground selection tool (since GIMP 2.4),
probably you can use much of its design or at least user interface.  Also
make sure that you don't accidentally use the same algorithm ;-)  Since the
usage seems to be similar, maybe this could even be made an alternative
choosable algorithm there?

Daniel


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[haenselmann]

On Fri, Apr 11, 2008 at 08:36:32PM +0200, Daniel Hornung wrote:

(...)

> > From what you write and what it looks like on your project page, you should
> > probably write a tool instead of a plugin (you may find fitting examples
> > under gimp-2.4.5/app/tools).  Also, you could then use any brush available
> > to the Gimp.
> >
> >   Torsten
>
> Just have a look at the current foreground selection tool (since GIMP 2.4),
> probably you can use much of its design or at least user interface.  Also
> make sure that you don't accidentally use the same algorithm ;-)  Since the
> usage seems to be similar, maybe this could even be made an alternative
> choosable algorithm there?
>
> Daniel

Thanks for your hints. I'll try to understand what a tools is at the
week-end. Concerning the algorithm, I actually wondered why such an
alpha-matting approach was not implemented before. The most recent
thing I've seen on in gimp is a graph-cut approach which I consider to
be among the most advanced approaches available at the moment.

Alpha-matting is kind of orthogonal to segmentation. At least in my
version, it requires the user to define what is to be segmented (a
very rough silhouette) but then, the results are sometimes of very
high quality, especially for fuzzy objects because an individual alpha
values is calculated for every pixel, individually. This is something
that Photoshop does but which I have not yet seem on Gimp.

BTW: I tried to avoid any possible patent issues in that area. Did you
ever get feedback or into trouble with Adobe?

Thomas

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--
Dr. Thomas Haenselmann @ University of Mannheim
phone [phone] (voice -2603) (fax -2601)


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[Sven Neumann]

Hi,

On Fri, 2008-04-11 at 23:43 +0200,
haenselmann@... wrote:

> Alpha-matting is kind of orthogonal to segmentation. At least in my
> version, it requires the user to define what is to be segmented (a
> very rough silhouette) but then, the results are sometimes of very
> high quality, especially for fuzzy objects because an individual alpha
> values is calculated for every pixel, individually. This is something
> that Photoshop does but which I have not yet seem on Gimp.

This sounds like something that would be nice to have as a
post-processing step in the SIOX Foreground Selection tool. Have you had
a look at the refinement brush that the SIOX guys have suggested? Sounds
similar to your approach and still awaits implementation in GIMP. So far
we don't have anyone working on it, even though most of the code is
already in place.


Sven


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