[Insight-developers] How to get the input requested region of a filter?

[Miller, James V (Research)]

Julien, 

You could manually perform the steps that DataObject::Update() does:

filter->GetOutput()->UpdateOutputInformation();
filter->GetOutput()->PropagateRequestedRegion();

After making these calls, all the meta data and pipeline information should 
be available (LargestPossibleRegion, RequestedRegion, pipeline modified
times).

You can then call

filter->GetInput()->GetRequestedRegion()

to see what RequestedRegion is being requested for the input to your filter.

Note that the first two calls are on the OUTPUT of the filter.  Everything
is driven from the filter output.  After calling these methods on the 
OUTPUT of the filter, the meta data on the INPUTS will be valid.

Jim



-----Original Message-----
From: Julien Jomier [mailto:jjomier at cs.unc.edu]
Sent: Monday, October 11, 2004 12:49 PM
To: insight-developers at itk.org
Subject: [Insight-developers] How to get the input requested region of a
filter?


Hi,

I'm tying to get the input requested region of a filter, before running it.
I know that GenerateInputRequestionRegion() is computing the requested
region, but for most of the ITK filters this function is protected.

Is there another way to get the input requested region of a filter?

Thanks,

Julien

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