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

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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 D=C5=BEenan Zuki=C4=87 <[email protected]> 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,
> D=C5=BEenan
>
> On Sat, May 5, 2018 at 6:08 PM Soren Christensen <[email protected]>
> 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=3D=3D0:
>>
>> 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=3Dk+1
>>
>>
>> k=3D0
>>
>> 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 th=
e
>> 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
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>>
>> Kitware offers ITK Training Courses, for more information visit:
>> http://www.kitware.com/products/protraining.php
>>
>> Please keep messages on-topic and check the ITK FAQ at:
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>

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<div dir=3D"auto"><div>Hi Dzenan,</div><div dir=3D"auto">=C2=A0Thanks!</div=
><div dir=3D"auto">It does seem that the level sets filter mtime is changin=
g though (top number)?</div><div dir=3D"auto">I managed to get it working b=
y initializing the threshold filter inside the progress callback. The outpu=
t now changes with each callback.</div><div dir=3D"auto"><br><br>Thanks!</d=
iv><div dir=3D"auto">Soren<br><br><br><div class=3D"gmail_quote" dir=3D"aut=
o"><div dir=3D"ltr">On Sun, May 6, 2018, 08:52 D=C5=BEenan Zuki=C4=87 &lt;<=
a href=3D"mailto:[email protected]" target=3D"_blank" rel=3D"noreferrer">dz=
[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:verdana,sans=
-serif;font-size:small">Hi Soren,</div><div class=3D"gmail_default" style=
=3D"font-family:verdana,sans-serif;font-size:small"><br></div><div class=3D=
"gmail_default" style=3D"font-family:verdana,sans-serif;font-size:small">pr=
ogress events do no modify the filter, hence the MTime does not change. MTi=
me changes when filter&#39;s parameters are changed - and only the ones whi=
ch require re-computation of the output.</div><div class=3D"gmail_default" =
style=3D"font-family:verdana,sans-serif;font-size:small"><br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:verdana,sans-serif;font-size:smal=
l">Regards,</div><div class=3D"gmail_default" style=3D"font-family:verdana,=
sans-serif;font-size:small">D=C5=BEenan</div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr">On Sat, May 5, 2018 at 6:08 PM Soren Christensen &l=
t;<a href=3D"mailto:[email protected]" rel=3D"noreferrer noreferrer" target=
=3D"_blank">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex"><div dir=3D"ltr">Hi,<div>=C2=A0I am trying to monitor the progres=
s of a levelset filter using a=C2=A0Progressevent=C2=A0callback.</div><div>=
I am thresholding the level set output with a thresholding filter and this =
works as expected in terms of the end results.</div><div>However,=C2=A0<spa=
n style=3D"color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small=
;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;f=
ont-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-=
transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255=
,255,255);text-decoration-style:initial;text-decoration-color:initial;float=
:none;display:inline">=C2=A0I am trying to monitor the progress of a levels=
et filter using a=C2=A0Progressevent=C2=A0callback and</span>=C2=A0it is no=
t working inside the progressevent callback.</div><div><br></div><div>Here&=
#39;s the code:</div><div>....</div><div>Set up level and threshold filter<=
/div><div>...</div><div>#define call back function</div><div>

<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">def myCommand(=
):</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">    global k</=
p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">    if k % 10=
=3D=3D0:</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        thresh=
older.Update()</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        print(=
levelsetfilter.GetMTime())    #print mtime for levelset filter and then thr=
esholdfilter</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        print(=
thresholder.GetMTime())</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        print(=
&quot;----&quot;)</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        save_r=
gb(levelsetfilter.GetOutput(),&#39;mont&#39; + str(k)+ &#39;.png&#39;)</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">        </p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">    k=3Dk+1</p=
><br></div><div>

<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap"><br></p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">k=3D0</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">levelsetfilter=
.AddObserver(itk.ProgressEvent(), myCommand )</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap">levelsetfilter=
.Update()</p>
<p style=3D"margin:0px;text-indent:0px;white-space:pre-wrap"><br></p><p sty=
le=3D"margin:0px;text-indent:0px;white-space:pre-wrap"><br></p><p style=3D"=
margin:0px;text-indent:0px;white-space:pre-wrap">The output from the print =
statements are:</p><p style=3D"margin:0px;text-indent:0px"><span style=3D"w=
hite-space:pre-wrap">18702
<b>18145</b>
----
18738
<b>18145</b>
----
18765
<b>18145</b>
----
18792
<b>18145</b>
----
18819
<b>18145</b>
</span>...</p><p style=3D"margin:0px;text-indent:0px">...</p><p style=3D"ma=
rgin:0px;text-indent:0px">...</p><p style=3D"margin:0px;text-indent:0px"><b=
r></p><p style=3D"margin:0px;text-indent:0px">So the mtime for the threshol=
d filter never gets modified when inside the call back.</p><p style=3D"marg=
in:0px;text-indent:0px"><br></p><p style=3D"margin:0px;text-indent:0px">Wha=
t is the reason for this? Is there something particular about the execution=
 pipeline when inside a callback like this?</p><p style=3D"margin:0px;text-=
indent:0px"><br></p><p style=3D"margin:0px;text-indent:0px">Thanks!</p><p s=
tyle=3D"margin:0px;text-indent:0px">Soren</p><br></div><div><br></div><div>=
<br></div></div>
The ITK community is transitioning from this mailing list to <a href=3D"htt=
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</blockquote></div>
</blockquote></div></div></div>

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