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

Luis Ibanez luis.ibanez at kitware.com
Fri Feb 5 12:50:23 EST 2010 

Hi Steve,

Since what you want to get as output is an image that
has the same size as the input image, with only a subregion
being modified, you should use a pipeline such as:

      1) RegionOfInterestImageFilter
      2) MedianFilter
      3) PastImageFilter

Where the PasteImageFilter will combine the output
of the Median, with the original input image.

   Regards,


         Luis


---------------------------------------------
On Fri, Feb 5, 2010 at 9:04 AM, steve harris <steve.harris18 at hotmail.com> wrote:
> hello,
>
> Still filtering all the image.
>
> Steve
>
>
> ________________________________
> Date: Fri, 5 Feb 2010 13:01:59 +0100
> Subject: Re: [Insight-users] Apply filter only on a specific region ?
> From: imacia at vicomtech.org
> To: steve.harris18 at hotmail.com
> CC: luis.ibanez at kitware.com; insight-users at itk.org
>
> Hi,
>
> Try
>
> medianFilter->GetOutput()->SetRequestedRegion( wantedRegion3 )
>
> before updating. The request must be done on the output, not in the input.
> The pipeline calculates which is the required input to generate the output,
> which in turn will be the output of the previous filter, and so on.
>
> Best regards
>
> Ivan
>
> 2010/2/5 steve harris <steve.harris18 at hotmail.com>
>
> 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
>> >
>> > ________________________________
>> > Faites une bonne action avec Bing Solidaire ! C'est ici !
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>> >
>> _____________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
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>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.html
>>
>> Please keep messages on-topic and check the ITK FAQ at:
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>>
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>
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