[ITK-users] Watershed filter: vary level parameter without running update

[Dženan Zukić]

Hi Bipul,

the way I understood that is this:

watershed->SetInput(inImage);
watershed->SetLevel(0.8);
watershed->Update(); //the initial segmentation, slow
seg8=watershed->GetOutput();
seg8->DisconnectPipeline(); //might not be needed

watershed->SetLevel(0.6);
watershed->Update(); //simple relabeling, quick
seg6=watershed->GetOutput();
seg6->DisconnectPipeline(); //might not be needed

watershed->SetLevel(0.55);
watershed->Update(); //simple relabeling, quick
seg55=watershed->GetOutput();
seg55->DisconnectPipeline(); //might not be needed

Give it a try, and if you run into issues ask for help on the new forum
<https://discourse.itk.org/>, to which we are transitioning.

Regards,
Dženan

On Fri, Nov 10, 2017 at 2:05 AM, bipul <bxt161230 at utdallas.edu> wrote:

> Hi,
>
> The documentation for the watershed filter says that
>
> /"The Level parameter can be used to create a hierarchy of output images in
> constant time once an initial segmentation is done. A typical scenario
> might
> go like this: For the initial execution of the filter, set the Level to the
> maximum saliency value that you anticipate might be of interest. Once the
> initial Update() of this process object has finished, the Level can be
> manipulated anywhere below the initial setting without triggering a full
> update of the segmentation mini-pipeline. All that is now be required to
> produce the new output is a simple relabeling of the output image."/
>
> I was interested in knowing how to access these hierarchy of output images,
> once the update has been performed.
>
> Thank you.
>
> Best,
> Bipul Tarafdar
>
>
>
> --
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