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

[steve harris]

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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