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

[Soren Christensen]

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

[Dženan Zukić]

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,
DÅŸenan

Post by Soren Christensen
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.
....
Set up level and threshold filter
...
#define call back function
global k
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()
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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[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

Post by Dženan Zukić
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,
DÅŸenan

Post by Soren Christensen
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.
....
Set up level and threshold filter
...
#define call back function
global k
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()
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
The ITK community is transitioning from this mailing list to
discourse.itk.org. Please join us there!
________________________________
Powered by www.kitware.com
Visit other Kitware open-source projects at
http://www.kitware.com/opensource/opensource.html
http://www.kitware.com/products/protraining.php
http://www.itk.org/Wiki/ITK_FAQ
https://itk.org/mailman/listinfo/insight-users