[Insight-users] pipeline doesn't flush

[Karthik Krishnan]

Aditya Chandramouli wrote:

>Hi,
>
>I have the following (pseudo-)code:
>
>---------------------------------
>myFilter::New();
>myFilter->SetInput(myImage);
>
>for ( n iterations )
>{
>	perform operations on myImage;
>
>	myFilter->Update();
>}
>---------------------------------
>
>My problem is that the Update only seems to take place on the first iteration 
>of the loop. 
>
>On subsequent iterations, the update doesn't seem to take place although 
>myImage undergoes changes on each iteration and I need to re-run the filter 
>on it.
>  
>
Did you check the modified time of myImage to see if its MTime is 
changing ? If it is, the myFilter should update at each iteration..

I suspect in the "perform operations on myImage",  you are modifying 
your image using iterators etc.. Generally, most ITK inplace filters 
will change the modified time of their images. However if you used an 
image iterator to change the values manually or if you made SetPixel 
calls etc, for reasons of efficiency, the MTime is not changed.

Hope this helps.

>I've tried to reinsert the myFilter->SetInput(myImage) line within the loop, 
>with no effect.
>
>Any help or suggestions would be most appreciated.
>
>thanks.
>
>aditya
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>  
>