[ITK] Canny edge detection filter results

[Joao Ascenso]

A simple test I made. Just getting this example
http://docs.mitk.org/nightly/Step01Page.html with no use of the filters

Added  #include <itkCannyEdgeDetectionImageFilter.h>
           #include <itkDerivativeImageFilter.h>


and in the end

void canny(){
typedef itk::Image<float, 3> ImageType;
typedef itk::CannyEdgeDetectionImageFilter<ImageType, ImageType>
CannyFilter;

CannyFilter::Pointer filter = CannyFilter::New();
}

void derivative(){
typedef itk::Image<float, 3> ImageType;
typedef itk::DerivativeImageFilter<ImageType, ImageType> DerivativeFilter;

DerivativeFilter::Pointer filter = DerivativeFilter::New();
}


Only with derivative() builds successful and shows image

added  canny() gets the errors


On 2 February 2016 at 21:25, Dženan Zukić <dzenanz at gmail.com> wrote:

> Can you share the source code of the example which uses the Canny filter?
>
> On Tue, Feb 2, 2016 at 4:24 PM, Joao Ascenso <j.ascenso at campus.fct.unl.pt>
> wrote:
>
>> That's what have done. Started a new project, new directory and just using
>> the canny filter gives me that, but no problems without it.
>> Forget to mention I'm working with MITK.
>>
>>
>> On 2 February 2016 at 21:08, Dženan Zukić <dzenanz at gmail.com> wrote:
>>
>>> The safest cure for such things is to do a clean rebuild (create new
>>> build directory, do cmake and then open .sln file with VS and build). Let
>>> us know if you run into problems.
>>>
>>> HTH
>>>
>>> On Tue, Feb 2, 2016 at 4:01 PM, Joao Ascenso <
>>> j.ascenso at campus.fct.unl.pt> wrote:
>>>
>>>> Hello again,
>>>>
>>>> For some reason this errors appear in itkSparceFieldLayer.hxx
>>>>
>>>> Error C2512 'itk::ListNode<itk::Index<3>>': no appropriate default
>>>> constructor available
>>>> Error C2027 use of undefined type 'itk::ListNode<itk::Index<3>>'
>>>> Error C2227 left of '->Next' must point to class/struct/union/generic
>>>> type
>>>> Error C2027 use of undefined type 'itk::ListNode<itk::Index<3>>'
>>>> Error C2227 left of '->Previous' must point to
>>>> class/struct/union/generic type
>>>>
>>>> They are related with the compilation of
>>>> itk::CannyEdgeDetectionImageFilter. I've been using it so far with no
>>>> problem. It started when I run the cmake file again and it complained about
>>>> Platform Toolset v140 not being installed. I changed back to v120 to run it
>>>> and those errors started.
>>>>
>>>> Generated project again in cmake to make sure it was with Visual Studio
>>>> 12, same result.
>>>> Any clues on this? Thanks
>>>>
>>>> On 19 January 2016 at 17:05, Joao Ascenso <j.ascenso at campus.fct.unl.pt>
>>>> wrote:
>>>>
>>>>> Thank you Dženan.
>>>>>
>>>>> I did some oversampling between slices to solve the problem, with the
>>>>> downside of making it much slower.
>>>>>
>>>>>
>>>>>
>>>>> On 18 January 2016 at 21:26, Dženan Zukić <dzenanz at gmail.com> wrote:
>>>>>
>>>>>> Hi Joao,
>>>>>>
>>>>>> if you are doing Canny filtering in 3D and then looking at 2D slices,
>>>>>> the edges are usually not 1 pixel thick. This is because edge for 3D is a
>>>>>> surface, and when you slice that surface along anatomical axes the surface
>>>>>> will not be orthogonal to the slices in most places. Where surface is
>>>>>> orthogonal, you get nice 1 pixel wide intersections. Where surface is
>>>>>> parallel to the slice, you get a sizable intersection surface.
>>>>>>
>>>>>> Regards,
>>>>>> Dženan
>>>>>>
>>>>>> On Mon, Jan 18, 2016 at 11:47 AM, Joao Ascenso <
>>>>>> j.ascenso at campus.fct.unl.pt> wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>> I'm working on OCT images (DICOM volume) of the retina and trying to
>>>>>>> do the segmentation of some layers.
>>>>>>>
>>>>>>> After doing some noise reduction I'm applying the
>>>>>>> CannyEdgeDetectionImageFilter, but the result give me thicker edges than
>>>>>>> should be expected from Canny.
>>>>>>>
>>>>>>> Changing thresholds influences the amount of edges detected but
>>>>>>> don't improve this issue.
>>>>>>>
>>>>>>> Anyone have came across similar problem? Any suggestion is welcome.
>>>>>>>
>>>>>>> Thank you,
>>>>>>>
>>>>>>> João Ascenso
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Community mailing list
>>>>>>> Community at itk.org
>>>>>>> http://public.kitware.com/mailman/listinfo/community
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> João Ascenso
>>>>> Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologias
>>>>> Mestrado Integrado em Engenharia Electrotécnica e de Computadores
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> João Ascenso
>>>> Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologias
>>>> Mestrado Integrado em Engenharia Electrotécnica e de Computadores
>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> João Ascenso
>> Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologias
>> Mestrado Integrado em Engenharia Electrotécnica e de Computadores
>>
>>
>>
>


-- 
João Ascenso
Universidade Nova de Lisboa - Faculdade de Ciências e Tecnologias
Mestrado Integrado em Engenharia Electrotécnica e de Computadores
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