[Insight-users] Filter plans

Tue Oct 17 20:44:24 EDT 2006

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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