[Insight-users] Speeding up the SpatialObjectToImageFilter

[Julien Jomier]

We are looking into the issue. Sorry for the inconvenience.

Julien

Dan Mueller wrote:
> Hi Thx,
> 
> There seems to be a temporary problem with the Insight Journal site. I
> don't have a copy handy, so we'll just have to be patient.
> 
> Regards, Dan Mueller
> 
> 2008/6/17 Heike Moll <Heike.Moll at rwth-aachen.de>:
>> Hi Dan,
>>
>> I have the same problem like Anja (but with a SurfaceSpatialObject).
>>
>> I want to look at your Insight Journal contribution but I can't open it! Please, can you send me a copy?
>>
>> Thx Heike
>>
>> ----- Ursprüngliche Nachricht -----
>> Von: Dan Mueller <dan.muel at gmail.com>
>> Datum: Dienstag, Juni 17, 2008 11:18 am
>> Betreff: Re: [Insight-users] Speeding up the SpatialObjectToImageFilter
>> An: Anja Ende <anja.ende at googlemail.com>
>> Cc: insight-users at itk.org
>>
>>> Hi Anja,
>>>
>>> You may want to look at my Insight Journal contribution "Using a Mask
>>> to Decrease Computation Time for SpatialObject to Image Conversions":
>>> http://www.insight-
>>> journal.org/InsightJournalManager/view_reviews.php?pubid=117
>>> The approach taken is to firstly compute a low resolution mask of the
>>> image, dilate the mask (to ensure it includes all areas), and then
>>> compute the conversion only for pixels under the mask. As I wrote the
>>> paper over 2 years ago, I can't recall if it will work for
>>> BlobSpatialObjects, but you can give it a shot.
>>>
>>> Hope this helps.
>>>
>>> Regards, Dan
>>>
>>> 2008/6/17 Anja Ende <anja.ende at googlemail.com>:
>>>> Hello everyone,
>>>>
>>>> I am using the SpatialObjectToImageFilter as follows:
>>>>
>>>> typedef typename itk::Image<unsigned char, 3> ImageType;
>>>> typedef typename itk::SpatialObjectToImageFilter<PolygonType,
>>>> ImageType> SpatialObjectToImageFilterType;
>>>> typedef typename SpatialObjectToImageFilterType::Pointer
>>>> SpatialObjectToImageFilterTypePointer;
>>>> SpatialObjectToImageFilterTypePointer filter =
>>>> SpatialObjectToImageFilterType::New();
>>>> filter->SetInput(segmentation);
>>>> typename ImageType::SizeType size;
>>>> size[0] = sizeX;
>>>> size[1] = sizeY;
>>>> size[2] = sizeZ;
>>>> filter->SetSize(size);
>>>> filter->Update();
>>>>
>>>> In the above code, "segmentation" object is an
>>> itk::BlobSpatialObject> type pointer and as you can see I am using
>>> it on a 3D volume.
>>>> The problem I am facing is that this is very slow. Even when I
>>> have a
>>>> blob object that defines a segmentation in only one slice and the
>>> rest> of the slices are basically blank, still it is quite slow. The
>>>> Update() call takes about 10 seconds on my machine. I am
>>> wondering if
>>>> there is a way to speed this up with something like preinitializing
>>>> the Filter with the size? Anyone has any ideas on this?
>>>>
>>>> Many thanks,
>>>>
>>>> Anja
>>>> _______________________________________________
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>>>> Insight-users at itk.org
>>>> http://www.itk.org/mailman/listinfo/insight-users
>>>>
>>> _______________________________________________
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>>>
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