[Insight-users] SignedDanielssonDistanceMapImageFilter and ContourExtractor2DImageFilter

[Juan Cardelino]

Robin,
You answered only to me. I'm forwarding this back to the list. I don't
think it will make sense to do that. It doest, when the algorithm uses
a treshold, but if it works as I am guessing (marching cubes/squares)
I don't think doing that will help. But well, it is just an opinion,
you can always try.

On Wed, Jul 13, 2011 at 6:07 PM, Robin Steel <rsteel19 at yahoo.co.uk> wrote:
> Would it make a difference to SetContourValue(0+a little)??
>
> --- On Wed, 13/7/11, Juan Cardelino <juan.cardelino at gmail.com> wrote:
>
>> From: Juan Cardelino <juan.cardelino at gmail.com>
>> Subject: Re: [Insight-users] SignedDanielssonDistanceMapImageFilter and ContourExtractor2DImageFilter
>> To: "David Doria" <daviddoria at gmail.com>
>> Cc: "ITK" <insight-users at itk.org>
>> Date: Wednesday, 13 July, 2011, 17:53
>> I don't think so, but for me it
>> works. You could try to my program
>> directly with your images and see what happens. If you get
>> more than 1
>> contour with your image and my code, maybe is an issue of
>> your image.
>> Whats the type and bit-depth of your images? Will it be
>> possible that
>> you are running into a quatization issue?
>> In my case, I'm working with float images to represent
>> distance maps
>> and they are computed with the
>> SignedDanielssonDistanceMapImageFilter,
>> so I see no difference there.
>>
>> Another thing you could try to dissect the problem and find
>> its
>> source,  is to compute the contour using another
>> method. See for
>> instance this example:
>> https://iie.fing.edu.uy/avn/misc_projects/examples/itk/shape/ZeroContourLevelSet.cxx
>> where I compute the resulting contour as a binary image. As
>> there I'm
>> not using the ContourExtractor, it could tell you if the
>> problem comes
>> from there or not.
>>
>> If you want I could test your code with my images and see
>> what happens.
>>
>> BTW, if you want to test how I compute the distance maps,
>> you could
>> use: https://iie.fing.edu.uy/avn/misc_projects/examples/itk/shape/SignedDanielssonDistanceMapImageFilter2.cxx
>>
>> I hope this helps.
>> Let me know.
>>
>> On Wed, Jul 13, 2011 at 9:19 AM, David Doria <daviddoria at gmail.com>
>> wrote:
>> > On Wed, Jul 13, 2011 at 8:11 AM, Juan Cardelino
>> > <juan.cardelino at gmail.com>
>> wrote:
>> >> David,
>> >>        Please look at the attached example.
>> This program takes a
>> >> distance map and an image, computes the zero level
>> set of the distance
>> >> map and overlays it over the image. It is used to
>> show segmentation
>> >> results. Look at the part that I extract the
>> contour and it will
>> >> answer your question.
>> >> I will contribute this one later on, because I
>> also ran into trouble
>> >> when trying to use the ContourExtractorFilter.
>> >> I hope this helps.
>> >> Regards,
>> >>             Juan
>> >
>> > Hm, the only difference I see is that you called:
>> >
>> >
>>  extractor->VertexConnectHighPixelsOff();
>> >
>>  extractor->ReverseContourOrientationOff();
>> >
>> > which didn't seem to change anything in my example? Am
>> I missing something else?
>> >
>> > David
>> >
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>