[ITK-users] [ITK] adding a global hierarchical watershed segmentation mode to itksnap

[Dr. Roman Grothausmann]

Hi Andras,


Many thanks for Your hints. We'll test them on our data. However, our data is 
not as standardized in quality as CT or MRT data and from our experience many of 
the "magic" segmentations demonstrated on CT or MRT data does not work on our data.
However, of all the segmentation modules I could find in Slicer or elsewhere 
none was based on a hierarchical watershed algorithm like the SegmentationEditor 
of the InsightApplications. Is there any other that I've missed?
Concerning my idea to implement this if no tool currently already exists:
Would such an extension be of more use in Slicer or itksnap?
For which of the both would it likely be easier to integrate the extension?

Best wishes
Roman

On 11/08/14 16:20, Andras Lasso wrote:
> Have you tried segmentation tools in 3D Slicer? There is a multi-label watershed
> segmentation tool that works in 3d
> (http://www.slicer.org/slicerWiki/index.php/Documentation/Nightly/Modules/Editor#WatershedFromMarkers),
> there are also a number of other generic semi-automatic segmentation tools (such
> as GrowCut) and a few fully-automatic specialized tools (for brain,
> airways, etc). Download the nightly build and also checkout the Segmentation
> category in the Extension Manager.
>
> Andras
>
> *From:* Dr. Roman Grothausmann <mailto:grothausmann.roman at mh-hannover.de>
> *Sent:* ‎Monday‎, ‎August‎ ‎11‎, ‎2014 ‎1‎:‎15‎ ‎AM
> *To:* itksnap-users at googlegroups.com <mailto:itksnap-users at googlegroups.com>
> *Cc:* ITK Mailing List <mailto:insight-users at itk.org>
>
> Dear mailing list members,
>
>
> For a long time now I've been searching for a replacement of the old
> SegmentationEditor (part of the InsightApplications) which I could not get to
> work even with older ITK-3.x. Somewhere I was told that it was integrated and
> maintained within itksnap. However the only tool in itksnap based on watershed
> segmentation seems to be the adaptive brush. It is very handy, but
> time-consuming in 3D and only for local segmentations. In contrast the
> SegmentationEditor used a global hierarchical watershed segmentation to pick
> labels from, see e.g. the video linked here:
> http://www.insight-journal.org/browse/publication/70
> Quite often now I've stumbled over data, that would likely have profited a lot
> of such a tool for segmentation.
>
> If such a tool working with ITK-4.x does not exist any more, I thought of
> implementing it as a global WS segmentation mode in itksnap. That way making the
> tool easier to find, to use and to ensure maintenance (should it be integrated
> into the itksnap code base in the end) and also avoiding recoding a GUI with
> mouse interaction and such.
>
> My current idea is to start, similar to the snake-tool, with pre-filtering like
> smoothing and optional edge-detection.
> Then the main edit mode to consist of the usual 4 subwindows showing an overlay
> of the grey-image and the watershed segmentation of the hierarchical WS-filter
> (hWS), side-by-side to another label-dataset (loaded like a tiled overlay) which
> consist of the actually chosen labels from the hWS as the final data (FD).
> The interaction I'm considering would be to LMB click on a label in the hWS
> which is then added to the FD as the current fg label, or removed with a RMB.
> The hierachrchy level of the hWS could be controlled by a slider or the mouse
> wheel + Shift in nearly real time if some region demands higher or lower
> detailed segmentation. When the fg label is changed, the segmentation added or
> removed with further mouse interactions would modify the new fg label.
> When all is done and the global WS mode is left, the FD label-dataset is added
> to the main segmentation of itksnap.
>
> Would that be possible to implement in itksnap 3.x?
> What source files of the itksnap code base should I look at for:
> - the pre-filtering mode of the snake (for the smoothing and edge detection)
> - the mouse interactions (for e.g. adding the whell + Shift interaction)
> - possible examples for the dual layout
>
> Thanks for any comments, help or hints.
> Roman
>
> --
> Dr. Roman Grothausmann
>
> Tomographie und Digitale Bildverarbeitung
> Tomography and Digital Image Analysis
>
> Institut für Funktionelle und Angewandte Anatomie, OE 4120
> Medizinische Hochschule Hannover
> Carl-Neuberg-Str. 1
> D-30625 Hannover
>
> Tel. +49 511 532-9574
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-- 
Dr. Roman Grothausmann

Tomographie und Digitale Bildverarbeitung
Tomography and Digital Image Analysis

Institut für Funktionelle und Angewandte Anatomie, OE 4120
Medizinische Hochschule Hannover
Carl-Neuberg-Str. 1
D-30625 Hannover

Tel. +49 511 532-9574