[Insight-users] Filter plans

Wed Oct 18 01:30:44 EDT 2006

Hey Robert
That sounds really interresting. What approach are you using in your filter?
I would very much like to hear more.

Best of regards

2006/10/18, Robert Tamburo <robert.tamburo at gmail.com>:
>
>  Hi guys,
>
>
> I'm actually working on a similar filter and should have it finished in a
> couple of days (depending on how my cold progresses). Basically the image
> takes as input a vector of input images and produces a single image with the
> "interesting" voxels from the input images labeled. I can post the filter
> when finished.
>
>
> -Robert
>
>  On Oct 17, 2006, at 6:15 PM, Prename Surname wrote:
>
>  Aha, that would of course also be an idea to do like that. I dont know
> any of these filters.
> So your interresting suggestion is to subclass the
> itk::NaryFunctorImageFilter< TInputImage, TOutputImage, TFunction >
> so that it accepts 3 input images in the constructor, and then internally
> does what?
>
>
> 2006/10/17, Gaëtan Lehmann <gaetan.lehmann at jouy.inra.fr>:
> >
> > Le Tue, 17 Oct 2006 21:18:16 +0200, Prename Surname
> > <bsd.diverse at gmail.com > a écrit:
> >
> > > aha i see...
> > > Yes, of course i know this is simple, but starting simple is always
> > the
> > > way
> > > to go :)
> >
> > sure
> >
> > >
> > > I think maybe you have misunderstood what i want to do. I dont want to
> >
> > > make
> > > a RGB image, i just want to combine 3 different binary mask images
> > into a
> > > single grayscale mask image with values 0,1,2,3 (0=background, 1=gm,
> > > 2=wm,3=wm)
> > > If i just manage this i can port it to vtk no problem.
> > > So i just wanted to create a composite filter to do this for me.
> > > Do you see what i mean?
> >
> > Yes, I think :-)
> > This mean you are sure that the object in an image is never overlapping
> > with the objects in the other images. Is it the case ?
> > If yes, you can use ChangeLabelImageFilter to change the value of your
> > background pixels to 0 (if it's not already the case), and the values of
> > the foreground pixel to 1 in the first image, 2 in the second one, and 3
> >
> > in the last one. Finally, you can add your 3 images with
> > NaryAddImageFilter to produce the image you want.
> > It can be quite boring to instantiate 4 filters to do that - perhaps
> > that's the right time to implement a custom filter based on
> > NaryFunctorImageFilter :-)
> >
> > Gaetan
> >
> > >
> > > Many regards :)
> > >
> > >
> > > 2006/10/17, Gaëtan Lehmann <gaetan.lehmann at jouy.inra.fr>:
> > >>
> > >>
> > >> Hi,
> > >>
> > >> Most of the time, the simple manipulation like this one can already
> > be
> > >> done in ITK or VTK, so you shouldn't have to create a new filter to
> > do
> > >> that :-)
> > >> However, we are always pleased to see someone motivated to develop
> > some
> > >> new features for the toolkit, especially if he/she want to contribute
> > >> that
> > >> code to the community. I'm pretty sure you'll find something useful
> > to
> > >> code soon :-)
> > >>
> > >> To combine your 3 images, you can use ComposeRGBImageFilter (1),
> > which
> > >> takes 3 input images and give you a RGB image.
> > >> However, I'm not sure you can pass the rgb image directly to vtk
> > >> (perhaps
> > >> something to code :-)). You'll have to pass the 3 binary images in
> > vtk
> > >> with ImageToVTKImageFilter, and compose the color image in vtk.
> > >>
> > >> Gaetan
> > >>
> > >> (1)
> > >>
> > http://www.itk.org/Doxygen/html/classitk_1_1ComposeRGBImageFilter.html
> > >>
> > >>
> > >>
> > >> Le Tue, 17 Oct 2006 19:56:04 +0200, Prename Surname
> > >> <bsd.diverse at gmail.com> a écrit:
> > >>
> > >> > Hello.
> > >> > I am beginning to feel a bit more at home in itk/vtk now. There are
> >
> > >> > still a
> > >> > zillion things to learn about it, but its getting a bit better. So
> > >> now i
> > >> > have decided that i want to try and make my own filter to get more
> > >> > acquainted with the whole pipeline approach.
> > >> >
> > >> > I have read chapter 13 in the itksoftwareguide, and i have thought
> > >> about
> > >> > a
> > >> > approach to make my filter. I was hoping some of you experts would
> > >> tell
> > >> > me
> > >> > if i am completely off, or if my idea is okay.
> > >> > My situation is this:
> > >> > I have a greyscale volume consisting of 182 slices that are 182x218
> >
> > >> > pixels
> > >> > of a brain.
> > >> > I have a mask of corresponding size with values 0 and 255 for the
> > >> > positions
> > >> > of greymatter
> > >> > I have a mask of corresponding size with values 0 and 255 for the
> > >> > positions
> > >> > of whitematter
> > >> > I have a mask of corresponding size with values 0 and 255 for the
> > >> > positions
> > >> > of CSF(brainfluid)
> > >> >
> > >> > Basically i want my filter to combine the 3 masks to a single
> > image,
> > >> so
> > >> > that
> > >> > i can visualize this image in vtk with different colors for
> > >> greymatter,
> > >> > whitematter and CSF.
> > >> >
> > >> >
> > >> > Making a filter (lets call it masking)that subclasses
> > >> ImageToImageFilter,
> > >> > and then takes 2 input images and somehow combining them to a
> > single
> > >> > image
> > >> > by just adding them together.
> > >> >
> > >> > I then want to make a compositefilter that actually makes a
> > pipeline
> > >> of
> > >> 2
> > >> > masking filters, taking first 2 masks, combining them in the
> > masking
> > >> > filter,
> > >> > takes the output of this and combine it with the third mask using
> > >> again
> > >> > the
> > >> > masking filter, and then outputting the final masked image.
> > >> >
> > >> > Does this sound  feasible, and more important is this a good
> > approach?
> > >> > I hope for some feedback.
> > >> >
> > >> > Many regards and thank you
> > >>
> > >>
> > >>
> > >> --
> > >> Gaëtan Lehmann
> > >> Biologie du Développement et de la Reproduction
> > >> INRA de Jouy-en-Josas (France)
> > >> tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
> > >> http://voxel.jouy.inra.fr
> > >>
> >
> >
> >
> > --
> > Gaëtan Lehmann
> > Biologie du Développement et de la Reproduction
> > INRA de Jouy-en-Josas (France)
> > tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
> > http://voxel.jouy.inra.fr
> >
>
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