[Insight-users] Using itkDiscreteGaussianImageFilter while wr iting multiple outputs

[Miller, James V (Research)]

Typically what we do is

typedef itk::ImageFileWriter<ImageType> WriterType;
WriterType::Pointer writer = WriterType::New();

gausian->SetVariance( var1 );
WriterType::Pointer writer = WriterType::New();
writer->SetInput(gaussian->GetOutput());
writer->SetFilename( std::string( fileprefix
)+std::string("var1")+std::string(".mhd") );
writer->Update();

gaussian->SetVariance( var2 );
WriterType::Pointer writer2 = WriterType::New();
writer2->SetInput(gaussian->GetOutput());
writer2->SetFilename( std::string( fileprefix
)+std::string("var2")+std::string(".mhd") );
writer2->Update();

...

Note that normally, we do not bother creating an ImageIO object for the
particular
format we want to use. In many cases, you can rely on the factory mechanism
to
instantiate the proper ImageIO object required to write a file with a
particular
extension.




-----Original Message-----
From: Robert Maroon [mailto:robertmaroon@yahoo.com]
Sent: Friday, May 07, 2004 3:02 PM
To: Miller, James V (Research); ITK
Subject: RE: [Insight-users] Using itkDiscreteGaussianImageFilter while
wr iting multiple outputs


Hi James,

I'm using version 1.6.

I'm not 100% sure what you mean when you say
instantiate a new writer - are you talking about a new
MetaImageIO writer or the regular image writer?

Thanks!

--- "Miller, James V (Research)" <millerjv@crd.ge.com>
wrote:
> What version of ITK are you using? 1.4, 1.6, CVS?
> 
> There was a bug in the MetaIO that did not allow
> writer to be re-used for a
> different file.  I think that has been fixed.
> 
> You might try instantiating a new writer for each
> file every time you call
> SetVariance on the gaussian, connect the gaussian to
> a new writer.
> 
> Jim
> 
> -----Original Message-----
> From: Robert Maroon [mailto:robertmaroon@yahoo.com]
> Sent: Friday, May 07, 2004 12:04 PM
> To: ITK
> Subject: [Insight-users] Using
> itkDiscreteGaussianImageFilter while
> writing multiple outputs
> 
> 
> Hi all,
> 
> I am having a problem using the
> itkDiscreteGaussianImageFilter in a progam where I
> am
> inputting a volume using a metaheader, and then
> using
> a while loop to:
> 
> 1) Apply a Gaussian of sigma_i to the volume.
> 2) Write it to a file where I add i to the end      
>  
>  of the file name (before the extension).
> 3) Change the sigma to sigma_i+1 using
> gaussianFilter->SetVariance(newSigma)
> 4) Repeat.
> 
> The problem is that while the raw files are being
> written out, they all have only the first sigma
> applied to them. Is there a way to update a filter
> in
> the middle of a program like I describe and make it
> update it's parameters? Thus applying the updated
> sigma to each new volume?
> 
> Also, when I write out the files, I get all the
> numbered .raw files but I only get one metaheader
> file
> pertaining to the last one written out. Is there
> anyway of making it write multiple metaheader files?
> 
> 
> For the metaheader files I am using:
> itk::MetaImageIO for the image types, and I do a 
> 
> writer->SetImageIO( metaWriter );
> 
> after I set the input of the writer.
> 
> Thanks!
> 
> 
> 
> 	
> 		
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