AW: [Insight-users] Which segmentation algorithm can fulfill this task?

[Luis Ibanez]

Hi Chuyan,

The ThresholdSegmentationLevelSet method is capable
of manging contours that are partially inside and
partially outside the object to be segmented.

You should try the application:

    ThresholdSegmentationLevelSetFltkGui.

available in

    InsightApplications

You can intentionaly draw a shape that is partially inside
and partially outside the object to be segmented, then let
evolve the level set. You will see how the contour propagates
in the direction of the edges.

There are several other LevelSet methods that will be capable
of propagating the level set front both outward and inward.

You may want to take a look at the book:

   "Level Set Methods and Fast Marching Methods"
   by J.A. Sethian
   Cambridge University Press.

for a description of the characteristics of Level Set
methods. Most of ITK level set methods are based on
this book.



Regards,


    Luis


---------------
jiang wrote:
> Hi Luis,
> Thank you very much for your information. I had a look at the
> ItkSoftwareGuide and reference paper Level Set Methods and Fast Marching
> Methods. I find that this method only allows the initial input contour
> inside the desired object. I didn't try the application you showed me. I
> don't know if the input contour is partial inside the object, partial
> outside it, then what will happen?
> In the ITK, is there one method, which can propagate the front both outward
> and inward?
> 
> Thank you again!
> 
> Chunyan
> 
> -----Ursprungliche Nachricht-----
> Von: Luis Ibanez [mailto:luis . ibanez at kitware . com]
> Gesendet: Montag, 22. Dezember 2003 19:35
> An: jiang
> Cc: ITK
> Betreff: Re: [Insight-users] Which segmentation algorithm can fulfill
> this task?
> 
> 
> 
> Hi Chuyan,
> 
> You can perform this task with the LevelSetSegmentation filters.
> 
> In particular, the ThresholdLevelSet segmentation filter
> http://www . itk . org/Insight/Doxygen/html/classitk_1_1ThresholdSegmentationLev
> elSetImageFilter.html
> is pretty robust for refining an initial contour.
> 
> This filter is described in the SoftwareGuide
> 
>         http://www . itk . org/ItkSoftwareGuide . pdf
> 
> under Section 9.3.4, pdf-page 386.
> 
> You will find examples in
> 
>   Insight/Examples/Segmentation
>                 ThresholdSegmentationLevelSetImageFilter.cxx
> 
> and a demo application with GUI in
> 
>   InsightApplications/ThresholdSegmentationLevelSetFltkGui
> 
> This application does pretty much what you are asking,
> the user manually draws an initial shape, and the filter
> refines this shape for fitting the edges of structures in
> the image.  Note that the user draws the solid inside of the
> object, not a delineated contour around the object, but
> for the purpose of user interaction this is about the same.
> 
> You will also find this level set filter  implemented as an
> ITK Plugin for VolView. You can download the free version
> of VolView from
> 
>       http://www . kitware . com/products/volview . html
> 
> 
> 
> Please let us know if you have further questions,
> 
> 
> Thanks
> 
> 
>    Luis
> 
> ------------------------
> jiang wrote:
> 
> 
>>Hi,
>>I want to segment one area from an image. Let user to draw a coarse contour
>>around this area firstly. Is there an algorithm which has been implemented
>>in ITK can refine the coarse contour in order to get the precise
>>segmentation result?
>>
>>Thank you very much!
>>
>>
>>Chunyan
>>
>>_______________________________________________
>>Insight-users mailing list
>>Insight-users at itk . org
>>http://www . itk . org/mailman/listinfo/insight-users
>>
>>
>>
> 
> 
> 
> 
> 
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