[Insight-developers] How simple is SimpleITK

[Blezek, Daniel J.]

Hi Bill,

  For some reason everyone thinks that SimpleITK is going to look like
Matlab...  The plan has been to _enable_ Matlab-like syntax, not demand
it.  We will continue the object oriented pattern, but augment with a
set of procedural calls.  So your example code would end up looking
something like this:


using namespace itk::simple;
Image::Pointer image;
image = ImageFileReader ( "Foo" );
image = RecursiveGaussian ( image, 2.0 )
ImageFileWriter ( image, "Bar" );

Or, if you like, this can be all done on one line...

ImageFileWriter ( RecursiveGaussian ( ImageFileReader ( "Foo" ), 2.0 ),
"Bar" );

In the OO pattern:

image = ImageFileReader().SetFilename ( "Foo" ).Execute()
image = RecursiveGaussion().SetSigma ( 2.0 ).Execute ( image )
ImageFileWriter().SetFilename ( "Bar" ).Execute ( image )

We are investigating making Execute a static method, so the code would
look like:

image = ImageFileReader::Execute ( "Foo" )
image = RecursiveGaussian::Execute ( image, 2.0 )
ImageFileWriter::Execute ( image, "Bar" )

This has not been checked in, because SWIG does not wrap it properly.  I
am working on this.

At the Iowa meeting, we decided to take the OO approach, as it was more
broadly approachable to Python and Java developers.

-dan

-----Original Message-----
From: insight-developers-bounces at itk.org
[mailto:insight-developers-bounces at itk.org] On Behalf Of Bill Lorensen
Sent: Tuesday, January 25, 2011 11:28 AM
To: Insight Developers
Subject: [Insight-developers] How simple is SimpleITK

Folks,

I just took a look at the current SimpleITK repo.

To me it looks like itk without templates and without pipelines.
Simpler indeed. And probably simpler to wrap.

However, it still is object-oriented, has namespaces, has Pointer's,
still uses set/get methods and still has an Execute method. It is still
quite ITK-like.

I thought it would be a bit more procedural and more acceptable to
non-itk(e.g. Matlab) users.

itksImage image  = itksReadImage(inputfilename);
image=itksRecursiveGaussian(image, sigma);
itksWriteImage(outputfilename);

versus

  itk::simple::Image::Pointer image;
  itk::simple::ImageFileReader reader;
  reader.SetFileName ( inputFilename);
  image = reader.Execute();

  itk::simple::RecursiveGaussianImageFilter gaussian;
  gaussian.SetSigma ( gaussian );
  image = gaussian.Execute ( image );

  itk::simple::ImageFileWriter writer;
  writer.SetFileName ( outputFilename );
  writer.Execute ( image );

Bill
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