[Insight-users] Problem with CannyEdgeDetectionImageFilter and ExtractImageFilter

[Bradley Lowekamp]

Hello,

Please submit a bug report to the bug tracker:
	
	http://public.kitware.com/Bug

My guess would be that some filter along the way miss handles a region  
or a iterator (setting it to the wrong region).

Brad
	
On Mar 11, 2009, at 4:19 AM, cyrille Valladeau wrote:

> Hi,
>
> Thanks for your answer.
> I place the try/catch block around each writer, with different error
> message. It doesn't change anything but it should be normal since the
> error is a segmentation fault not an Exception.
> I run a gdb (you have the log in attachenment), it seems that the  
> canny
> filter try to reach a pixel which index doesn't exist. I continue my
> investigation but your help is welcome.
>
> Thanks,
> Cyrille
>
> cyrille Valladeau a écrit :
>> Hi all,
>>
>> I'm making a class that uses a itkCannyEdgeDetectionImageFilter.
>> Unfortunatly my class generates a segmentation fault!!!
>> I've tried to fix the problem but it seems to be hard to find. First
>> I've thought it was a streming/threading problem in my own source  
>> code
>> but not.
>> I managed to identify the problem using basic itk classes. Applying a
>> canny edge detection over a full image works without any problem,
>> applying the same filter over an extract of an image which start  
>> index
>> is the same as the origin index of the full image works fine too, but
>> if you try to apply the filter ovec an extract of the image which
>> start index is not the image origin it give you the segfault.
>>
>> Well in attachment, you'll find an example that shows it. It  
>> applies a
>> canny over an image and then over an extract of the image (which  
>> start
>> index of the extract is given as argument).
>> The argument list is : input image, output full image, output
>> extracted image, extraction index.
>>
>> Is that a bug? Or am I doing something wrong?
>> If anybody has an idea it will be helpfull...
>> Thanks,
>> Cyrille
>>
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> -- 
> ************************************************************
>
> Cyrille VALLADEAU - Ingénieur d'études et développement - Traitement  
> d'images
> CS Systèmes d'Information - Division ESPACE
> Département Information Géographique & Image
> Téléphones : +33 5 61 17 65 72
> Email : cyrille.valladeau at c-s.fr
>
> ************************************************************
>
> <log.txt><ATT00001.txt>