[Insight-users] Apply filter only on a specific region ?
steve harris
steve.harris18 at hotmail.com
Fri Feb 5 06:48:54 EST 2010
Hello again,
I open again this subject because of what Louis suggested.
> or even use the SetRequrestedRegion()
> of the Median filter directly.
I was also interested in this methods so I quickly tried it but without success..
I didn't manage to find how to set the SetRequrestedRegion of the median filter directly ?
That's what I tried:
start3[0] = 0;
start3[1] = 0;
start3[2] = 0;
size3[0] = 20;
size3[1] = 20;
size3[2] = 20;
wantedRegion3.SetIndex(start3);
wantedRegion3.SetSize(size3);
mySimpleImage->SetRequestedRegion(wantedRegion3)
neighRadius2[0] = 1;
neighRadius2[1] = 1;
neighRadius2[2] = 1;
median->SetRadius(neighRadius2);
median->SetInput(mySimpleImage);
median->Update();
But when I display median->GetOutput() all the image has been filtred and not only my requested region...
Do I'm missing something ?
Regards,
Steve
From: steve.harris18 at hotmail.com
To: imacia at vicomtech.org; luis.ibanez at kitware.com
Date: Tue, 26 Jan 2010 10:48:22 +0000
CC: insight-users at itk.org
Subject: Re: [Insight-users] Apply filter only on a specific region ?
Hello,
Just a word to say that using this pipeline
RegionOfInterestImageFilter
MedianImageFilter
PasteImageFilter
it works, I mean I quickly tried and I got a good visual result (only the part I chossed has been filtred)
Thanks,
Steve
> From: imacia at vicomtech.org
> To: luis.ibanez at kitware.com; steve.harris18 at hotmail.com
> CC: insight-users at itk.org
> Subject: RE: [Insight-users] Apply filter only on a specific region ?
> Date: Mon, 25 Jan 2010 18:15:20 +0100
>
> Hi Luis,
>
> Just a question. We were discussing here at work the meaning of the
> different regions (Largest vs Requested vs Buffered). One question we had is
> if you can process a part of the image only by setting the Requested Region
> on the output, which seems quite straightforward and compatible with the ITK
> pipeline definition. What would you get here? An image whose Largest
> Possible Region is the same as the one you requested?
>
> The idea I have is that the Requested Region is an important part of the ITK
> pipeline and is used by the filters, at least internally, so why is its use
> discouraged in this case?
>
> Thanks in advance
>
> Iván
>
> PD: it is common the case in which we have to process only a certain part of
> the image in medical applications, for example when we have to calculate
> statistics in a region of interest from a 3D image, as defined by the
> radiologist. It may be inconsistent from the point of view image processing
> but it works :) This is just an example but we have find many cases in which
> we have had to restrict ourselves only to a certain part of the image as
> defined by the user, due to memory limitations or for a faster processing
> among other reasons.
>
>
> -----Mensaje original-----
> De: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] En
> nombre de Luis Ibanez
> Enviado el: domingo, 24 de enero de 2010 16:11
> Para: dsdfdff sfdsf
> CC: insight-users at itk.org
> Asunto: Re: [Insight-users] Apply filter only on a specific region ?
>
> 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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