[Insight-users] filter to create a subgraph of an image

[Roman Grothausmann]

Dear mailing list members,


Now I figured out that what I want is called a subgraph of an image. (As 
described on p. 19,20 by P. Soille in Morphological Image Analysis)

Is there a filter in itk that creates a subgraph of a grey input image?
(The only thing I could find for itk+subgraph is a bug-report: 
http://www.itk.org/Bug/bug_relationship_graph.php?bug_id=8005&graph=dependency)

Any help is very much appreciated
Roman

Roman Grothausmann wrote:
> Dear mailing list members,
> 
> 
> Is there a filter in ITK that converts a grey image into a profile plot 
> binary image? Eg a 2D grey image into a 3D binary image where the hight 
> of each voxel column corresponds to the grey value of the corresponding 
> pixel in the 2D image?
> Or how can I apply a morphological closing/opening on the profile of an 
> image as described below?
> 
> Any help is very much appreciated
> Roman
> 
> Roman Grothausmann wrote:
>> Dear Richard,
>>
>> Richard Beare wrote:
>>> I've submitted a suite of parabolic morphology tools to the insight 
>>> journal :
>>>
>>> http://hdl.handle.net/1926/1370
>>
>> I get redirected to http://ij.itk.org/midas/item/view/2280 and then it 
>> says:
>> You cannot access this item!
>>
>> But I found it over the Insight Journal search:
>> http://www.insight-journal.org/browse/publication/228
>>
>> It seems to be exactly what I'm looking for but reading Your 
>> contribution article I started to wonder:
>> How do You get from a 1D image (as in figure 1) to a 2D binary image 
>> (which consists of foreground pixel columns whose heights correspond 
>> to the intensity values of the 1D image pixels) so that You can 
>> perform the (2D) parabolic dilation?
>>
>> Or asked differently:
>> For smoothing a 2D image a 3D-ball (or paraboloid) is rolled over the 
>> intensity profile which is a uneven 2D surface in 3D space. But if I 
>> look at GrayscaleDilateImageFilter it expects a structuring element in 
>> 2D if the input is a 2D image. (And I'd say it's not the same result 
>> as rolling a 3D-ball over the intensity profile.)
>> So is there a pre-filter that would crate a 3D binary image (from my 
>> 2D grey image) on which I could apply the BinaryDilateImageFilter with 
>> a ball structuring element? (And then a filter to convert this 3D 
>> binary image back to a 2D grey image?)
>>
>> Many thanks again.
>> Roman
>>
>>
>>
>>> be sure to fetch the latest version from the repository referenced in 
>>> the paper.
>>>
>>> On 4/22/10, Roman Grothausmann 
>>> <roman.grothausmann at helmholtz-berlin.de> wrote:
>>>> Dear mailing list members,
>>>>
>>>>
>>>> To prevent a gradient decent filter from stopping at an insignificant
>>>> local minimum I'd like a ball of some radius to roll over the intensity
>>>> profile of an image. The result I'm interested in is the trace of the
>>>> ball (or paraboloid) centre while the ball is rolling.
>>>> I think this is equivalent to smoothing the image with such a rolling
>>>> ball filter as this ImageJ filter:
>>>>
>>>> http://rsbweb.nih.gov/ij/docs/menus/process.html#background
>>>>
>>>> And then tracing the gradient decent as is done in the Random access
>>>> iteration example in the user guide.
>>>>
>>>> So I wonder now is there a filter in ITK for image smoothing that works
>>>> by simulating a sliding ball or paraboloid like the imageJ filter?
>>>>
>>>> Any help is very much appreciated
>>>> Roman
>>>>
>>
> 

-- 
Roman Grothausmann

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