[Insight-users] Getting overlap region

Tue Feb 17 03:43:30 EST 2009

Hi!

Thanks for the response.

I´ll try to explain yout the issue. 
It is all about a regsitration problem.
I have two images, a fixed and a moving image. Lets consider the fixed image is of dimension [192 130 192] and the moving image is of dimension [192 7 192].
The metric will give you a sample exception error because too many samples are outside the moving image. 
Now, what i want to do is to define a mask, which contains the overlap of the two images and pass it to the metric->SetFixedImageMask() method, which expects a ImageMaskSpatialObject.

So now my problem is how to compute an overlap(image, spatialobject) containing the fixed and the moving images, or the fixed and the moving spatial objects, respectively. 
And i assume, i am capable of creating an ImageMaskSpatialObject with the help of the obtained overlap image or object and pass it to the metric.

thanks and best regards!

> From: andreas.schuh.84 at googlemail.com
> To: luis.ibanez at kitware.com
> Subject: Re: [Insight-users] Getting overlap region
> Date: Mon, 16 Feb 2009 12:11:05 +0100
> CC: erik_tuerke at hotmail.com; insight-users at itk.org
> 
> Hi,
> 
> the difference of determining the overlap region of two single  
> ImageRegions and of getting the overlap of two oriented images or  
> spatial objects is, that in the former case the regions are not  
> oriented (considered having the same orientation) whereas in the  
> latter cases you may have to be corncerned with the orientation of  
> your regions, too. In this case ImageRegion::Crop won't help if you  
> would like to have the oriented overlap region of minimal volume.  
> That's a more difficult task, where you will have to solve some  
> optimization problem probably by some kind of simplex algorithm.
> 
> Otherwise, as you Erik are interested in spatial objects and I assume  
> that the bounding boxes of these (SpatialObjects::GetBoundingBox) are  
> all oriented along the axes of the coordinate system, you have a  
> simpler task which can be solved by using ImageRegion::Crop.
> 
> --
> regards
> Andreas
> 
> Am 15.02.2009 um 22:52 schrieb Luis Ibanez <luis.ibanez at kitware.com>:
> 
> >
> > Hi Erik,
> >
> > The easiest method is among ImageRegions.
> >
> > In that case, simply use:
> >
> >    itk::ImageRegion::Crop()
> >
> > If you have two image regions
> >
> >    itk::ImageRegion regionA;
> >    itk::ImageRegion regionB;
> >
> > Then you can find the overlap by doing
> >
> >    regionA.Crop( regionB )
> >
> > The common region will be stored in the
> > variable regionA.
> >
> >
> >   Regards,
> >
> >
> >      Luis
> >
> > ------------------
> > Erik Türke wrote:
> >> Hi!
> >> Thanks for your response.
> >> Actually it doesnt matter, if i am doing this with an image, an  
> >> image region, or spatial object, since you can convert these types  
> >> amoung themselves. I guess ;-)
> >> I think, i would prefere the easiest method.
> >> But if there is no difference between the effort of these methods,  
> >> i would take the SpatialObject method.
> >> Thanks!
> >> best regards!
> >> > Date: Thu, 12 Feb 2009 11:16:21 -0500
> >> > From: luis.ibanez at kitware.com
> >> > To: erik_tuerke at hotmail.com
> >> > CC: insight-users at itk.org
> >> > Subject: Re: [Insight-users] Getting overlap region
> >> >
> >> >
> >> > Hi Erik,
> >> >
> >> > You question is too general.
> >> >
> >> > Could you elaborate on it please ?
> >> >
> >> > Do you :
> >> >
> >> > a) Have two images and want to create a third
> >> > image containing the overlap of the two images ?
> >> >
> >> > OR
> >> >
> >> > b) Have two itkImageRegions and want to compute
> >> > the itkImageRegion that represents the overlap
> >> > of the two ?
> >> >
> >> > OF
> >> >
> >> > c) Have two itkSpatialObjects and you are trying to
> >> > compute the itkSpatialObject representing their
> >> > overlap ?
> >> >
> >> >
> >> >
> >> > Thanks
> >> >
> >> >
> >> > Luis
> >> >
> >> >
> >> > ------------------
> >> > Erik Türke wrote:
> >> > > Hi!
> >> > >
> >> > > I am asking myself if there is any possibility to get the  
> >> region of an
> >> > > overlap of 2 images or a new object containing the overlap of 2  
> >> other
> >> > > objects, respectively.
> >> > >
> >> > > Thanks fr your help!
> >> > >
> >> > > Best regards!
> >> > >
> >> > >
> >> > >
> >> > >  
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