[Insight-users] Apply filter only on a specific region ?

[steve harris]

Hi Louis,

Thank you for your answer. I'm currently working on some 3D tools. In this case this one:

- I use the mouse to create a square (by clicking 4 times on the 3D view)
- I create A frustrum (from the 2d square) and get the polydata of it
- voxalize this polydata
-
Apply a AND filter between the voxelized polydata and my STL (3D obect
in the 3D view) that whay I get the intersected cells...
- Apply filters on the freshly selected region (selected cells..)

in other words.. I would like to be able to select a part of my 3D objects and apply a filter only on this part...

So yes, as output I would like the full input input with the subregion modified.
I will try follow your steps and see if it can work

Regards,
Steve 

> Date: Sun, 24 Jan 2010 10:10:44 -0500
> Subject: Re: [Insight-users] Apply filter only on a specific region ?
> From: luis.ibanez at kitware.com
> To: steve.harris18 at hotmail.com
> CC: insight-users at itk.org
> 
> Hi Steve,
> 
> It depends....
> 
> What exactly do you want at the output ?
> 
> A) The full input input with the subregion modified ?
> 
> or
> 
> B) only the modified subregion ?
> 
> ---
> 
> If you want (A) you will have to use a pipeline
> such as:
> 
> RegionOfInterestImageFilter
> MedianImageFilter
> PasteImageFilter
> 
> If you want (B) you could use simply
> 
> 
> RegionOfInterestImageFilter
> MedianImageFilter
> 
> or even use the SetRequrestedRegion()
> of the Median filter directly.  Although
> this last option is not a recommended
> practice, unless you are very familiar
> with the inner-workings of the ITK pipeline.
> 
> 
> --
> 
> On a side note:
> 
> Why do you want to do such thing ?    :-)
> 
> From the pure image processing point of view,
> it doesn't seem to be a good operation. You
> will end up with an inconsistent image...
> 
> 
> 
>      Regards,
> 
> 
>             Luis
> 
> 
> --------------------------------------
> On Fri, Jan 22, 2010 at 5:51 AM, dsdfdff sfdsf
> <steve.harris18 at hotmail.com> wrote:
> > Hello itk user,
> >
> > I was wondering if it was possible to apply a filter only on a specific
> > region of an image (like setting a bundary region)?
> >
> > for example if I have a simple 3D image (let say 30x30x30) is it possible
> > for example to apply the mean filter
> > only on the region (15x15x15)?
> >
> > regards,
> > Steve
> >
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