[Insight-users] Beginners question on loading images of any dimension

[Charanpal Dhanjal]

Hi Luis,

I'm using the gipl file format, although I also have some data in png
format.

I understand what you said about templating a class containing the pipeline
over dimension. I'm not sure about the method you suggested for figuring out
the input dimensionality. How could I determine if the image is a degenerate
volume with a single slice? Could I just pick a point in the image that's
likely to be inside the volume and check if it has a value? Is there a more
generic method?

Thanks,

Charanpal

----- Original Message ----- 
From: "Luis Ibanez" <luis . ibanez at kitware . com>
To: "Charanpal Dhanjal" <csd172 at yahoo . co . uk>
Cc: <insight-users at itk . org>
Sent: Thursday, August 07, 2003 3:22 PM
Subject: Re: [Insight-users] Beginners question on loading images of any
dimension


>
> Hi Charanpal,
>
> You don't want to do that in a medical image
> application. The dimensionality of the data
> is fundamental characteristic of the image.
>
> When you design the processing pipeline for a
> particular medical application, the data
> dimensionality is one of the first requirements
> to be defined.
>
> If your application is performing a processing
> generic enough to be used in any data dimension,
> you can encapsulate the ITK pipeline in a class
> templated over dimension. Then, you instantiate
> this class for both 2D and 3D, so your application
> has internally a full 2D pipeline and a full 3D
> pipeline.
>
> For figuring out the dimensionality of the input
> data you could instantiate a ImageFileReader of
> the maximum dimension expected. Do *not* plug
> this reader to any pipeline, since the crash is
> probably caused by the subsequent filters, not
> the reader itself.
>
> Loading a 2D image with a 3D ImageFileReader should
> work. It should return a degenerate volume with
> a single slice.
>
> What file format are you using for input ?
>
>
>
>    Luis
>
>
>
> --------------------------------------------
> Charanpal Dhanjal wrote:
> > How can I get an ITK ImageFileReader to read both a
> > 3D and 2D image in the same code depending on the input it gets. At the
> > moment, I need to write something like this:
> >
> >   typedef unsigned short      PixelType;
> >   const   unsigned int        Dimension = 2;
> >   typedef itk::Image< PixelType, Dimension >    ImageType;
> >   typedef itk::ImageFileReader< ImageType >  ReaderType;
> >   reader->SetFileName( inputFilename  );
> >
> > But the dimension of the image is defined as part of the template of
> > ImageFileReader. Is there some way to find out the dimension of an image
> > before we create the ImageFileReader? Or is there some alternative way
to
> > get ITK to load an image without specifying the dimension beforehand? At
the
> > moment ITK crashes if I try to, say load a 2D image with a 3D
> > ImageFileReader type.
> >
> > Thanks in advance for your help,
> >
> > Charanpal
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk . org
> > http://www . itk . org/mailman/listinfo/insight-users
> >
>
>
>
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