[ITK] [ITK-users] How to abort execution of ImageRegistrationMethodv4 / Optimizer

[Bradley Lowekamp]

Hello,

I think that the optimizer needs to be stopped or told to abort. Perhaps the registration method should forward the request to the optimizer?

Brad

On Dec 8, 2014, at 12:37 PM, Matt McCormick <matt.mccormick at kitware.com> wrote:

> Hi Bryn,
> 
> Thanks for looking into these issues.
> 
> Could a patches please be created to address them? [1].  I think a
> separate patch could be created for each member.  The check for
> AbortGenerateData should use the method:
> 
>  this->GetAbortGenerateData()
> 
> Thanks,
> Matt
> 
> [1] https://insightsoftwareconsortium.github.io/ITKBarCamp-doc/CommunitySoftwareProcess/SubmitAPatchToGerrit/index.html
> 
> On Thu, Dec 4, 2014 at 5:48 PM, Bryn Lloyd <lloyd at itis.ethz.ch> wrote:
>> At a first glance it seems that ImageRegistrationMethodv4 does not check for
>> the abort flag:
>> 
>> ImageRegistrationMethodv4<TFixedImage, TMovingImage, TTransform,
>> TVirtualImage>
>> ::GenerateData()
>> {
>>  this->AllocateOutputs();
>>  for( this->m_CurrentLevel = 0; this->m_CurrentLevel <
>> this->m_NumberOfLevels; this->m_CurrentLevel++ )
>>    {
>>    this->InitializeRegistrationAtEachLevel( this->m_CurrentLevel );
>> 
>>    this->m_Metric->Initialize();
>> 
>>    this->m_Optimizer->StartOptimization();
>>    }
>> }
>> 
>> If I modify this code to check for m_AbortGenerateData, the registration
>> terminates as expected.
>> 
>> 
>> In addition it seems that the members m_CurrentMetricValue,
>> m_CurrentIteration etc. are never updated during optimization.
>> 
>> Best regards
>> Bryn
>> 
>> 
>> 
>> 
>> On 04.12.2014 23:18, Bryn Lloyd wrote:
>>> 
>>> Hi
>>> 
>>> I recently started using ITK again and am trying out the ITK registration
>>> framework v4.
>>> 
>>> 
>>> I am trying to gracefully abort/stop the ImageRegistrationMethodv4
>>> process, however it just continues.
>>> 
>>> In my Command class, which observes an IterationEvent of the
>>> ImageRegistrationMethodv4 and Optimizer  I call
>>> 1.  registration_method_v4->SetAbortGenerateData( true ); // object of
>>> type ImageRegistrationMethodv4<...>
>>> 
>>> 2. optimizer->StopOptimization();
>>> 
>>> However, the process just continues to execute. Is this supposed to work?
>>> What am I doing wrong?
>>> 
>>> Thanks and best regards
>>> Bryn
>>> 
>>> 
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>> 
>> 
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> 
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