[ITK-users] strange filter behavior in Progressevent callback in itkwrap

[Soren Christensen]

Hi Dzenan,
 Thanks!
It does seem that the level sets filter mtime is changing though (top
number)?
I managed to get it working by initializing the threshold filter inside the
progress callback. The output now changes with each callback.


Thanks!
Soren


On Sun, May 6, 2018, 08:52 Dženan Zukić <dzenanz at gmail.com> wrote:

> Hi Soren,
>
> progress events do no modify the filter, hence the MTime does not change.
> MTime changes when filter's parameters are changed - and only the ones
> which require re-computation of the output.
>
> Regards,
> Dženan
>
> On Sat, May 5, 2018 at 6:08 PM Soren Christensen <sorench at gmail.com>
> wrote:
>
>> Hi,
>>  I am trying to monitor the progress of a levelset filter using
>> a Progressevent callback.
>> I am thresholding the level set output with a thresholding filter and
>> this works as expected in terms of the end results.
>> However,  I am trying to monitor the progress of a levelset filter using
>> a Progressevent callback and it is not working inside the progressevent
>> callback.
>>
>> Here's the code:
>> ....
>> Set up level and threshold filter
>> ...
>> #define call back function
>>
>> def myCommand():
>>
>> global k
>>
>> if k % 10==0:
>>
>> thresholder.Update()
>>
>> print(levelsetfilter.GetMTime()) #print mtime for levelset filter and
>> then thresholdfilter
>>
>> print(thresholder.GetMTime())
>>
>> print("----")
>>
>> save_rgb(levelsetfilter.GetOutput(),'mont' + str(k)+ '.png')
>>
>> k=k+1
>>
>>
>> k=0
>>
>> levelsetfilter.AddObserver(itk.ProgressEvent(), myCommand )
>>
>> levelsetfilter.Update()
>>
>>
>>
>> The output from the print statements are:
>>
>> 18702 *18145* ---- 18738 *18145* ---- 18765 *18145* ---- 18792 *18145*
>> ---- 18819 *18145* ...
>>
>> ...
>>
>> ...
>>
>>
>> So the mtime for the threshold filter never gets modified when inside the
>> call back.
>>
>>
>> What is the reason for this? Is there something particular about the
>> execution pipeline when inside a callback like this?
>>
>>
>> Thanks!
>>
>> Soren
>>
>>
>>
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