[ITK] Canny edge detection filter results

[Joao Ascenso]

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
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