[Insight-users] ITK-VTK pipeline progress bar help

[somi]

Hi Luis,
Thanks for your reply. It was very helpful.
My application has the following flow:

a)User specifies ROI interactively
b) Do segmentation in the specified region to get region A and B
c) Based on user specified thickness, label the boundary of the A and B  as
a new label C (of thickness specified by user)
d) Visualize the segmentation

Currently I have set this up as a series of ITK and VTK filters. Note that
due to size of dataset I release data on all filters, so the whole pipeline
is re-executed every time.

Currently I use neighborhood iterators for (c) . Should I wrap the
functionality into a filter ?
As the whole pipeline is re-executed everytime, what would be the
disadvantage of using iterators instead of a filter ?

Thanks,
Somi


On Thu, Apr 22, 2010 at 10:52 AM, Luis Ibanez <luis.ibanez at kitware.com>wrote:

>
> Hi Somi,
>
> You may want to look at the example:
>
> InsightApplications/QtITK/
> CMakeLists.txt
> itkQtAdaptor.h
> itkQtLightIndicator.h
> itkQtProgressBar.cxx
> itkQtProgressBar.h
> qtITK.cxx
>
> http://www.itk.org/cgi-bin/viewcvs.cgi/QtITK/?root=InsightApplications
>
> It show how to update a Qt progress bar by
> capturing progress events sent from an ITK
> filter.
>
> More specifically about your questions:
>
>
> a) In order to integrate a single progress value
>     by composing the progress reported by each
>     individual filter in a pipeline, you can use the
>     helper class:
>
>          Insight/Code/Common/
>               itkProgressAccumulator.h
>               itkProgressAccumulator.cxx
>
>     you need to register all the ITK filters with it
>     and you must come up with a percentage of
>     how much each filter contributes to the total
>     progress of the pipeline.
>
>     For examples of use, look at any of the following
>     filters:
>
>               Insight/Code/BasicFilters/
> itkOpeningByReconstructionImageFilter.txx
> itkOrientImageFilter.txx
> itkSignedDanielssonDistanceMapImageFilter.txx
> itkSignedMaurerDistanceMapImageFilter.txx
> itkSmoothingRecursiveGaussianImageFilter.txx
> itkZeroCrossingBasedEdgeDetectionImageFilter.txx
>
>
> b) Since ITK and VTK are independent toolkits you
>     will have to write specific command observers for
>     each family of filters.
>
>     and you may have to write a customized Progress
>     Accumulator that can take contributions from both
>     ITK and VTK.  Strictly speaking the progress
>     accumulator doesn't even need to know that filters
>     are involved in the process. It just needs to know
>     about relative contributions of every stage of
>     processing.
>
>
> c)  Why would you use iterators in the pipeline ?
>
>      Iterators are usually hidden from the
>      view of mortals inside the protective
>      enclosure of filters    :-)
>
>
>    Regards,
>
>
>        Luis
>
>
> -------------------------------------------------------------------
> On Tue, Apr 20, 2010 at 3:39 PM, somi <seesomi at gmail.com> wrote:
>
>> Hi,
>> I have a Qt based application where I load some image using ITK, do
>> segmentation, extract subsurface and display using vtk.
>> I need some help displaying the progress events.
>>
>> I have connected the ITK and VTK pipelines .  I want to show progress of
>> individual as well as total progress in separate Qt progress bars.
>>
>> a) How can I get the progress of the whole pipeline ? Do I have to use
>> QProgressDialog progress +  progress.setValue(n) + qApp->processEvents();
>> manually setting value of n after every filter ?
>>
>> b) For individual filter progress update do I use two different classes
>> one overriding  itk::Command and other  vtk::Command ? Do I have to use
>> separate progress bar for ITK/VTK
>>
>> c) What changes do I have to do if I use iterators in my pipeline ?
>>
>>
>> Thanks,
>> Somi
>>
>>
>>
>>
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