[Insight-users] How to change a grey image into a profile plot binary image

[Roman Grothausmann]

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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