[Insight-users] [ITK Community] Upgrading software from ITK 3.2 to ITK 4.4

[Brian Helba]

Hi Harri,

If you haven't found it yet, the ITK Wiki pages [1] and [2] are also good
resources.

To address your question about patents, as of v4.4 (actually some earlier
release [3]), all patented code *should* be gone. It's the policy of ITK to
no longer include patented code, unless it was properly licenced under the
terms of the Apache 2.0 license (ITK v4's new license), in which case you
as a user would also be granted a license [4].

[1] http://www.itk.org/Wiki/ITK/Release_4/Why_Switch_to_ITKv4
[2] http://www.itk.org/Wiki/ITK/Release_4/Removed_or_renamed_classes
[3]
http://itk.org/gitweb?p=ITK.git;a=commit;h=f7a67a9d775b3fb21aa331cb52cd81808b79e812
[4] http://www.apache.org/licenses/LICENSE-2.0#patent

Enjoy,
Brian


On Fri, Nov 15, 2013 at 3:17 AM, Harri Pölönen <hapapo at gmail.com> wrote:

>
> Hi all!
>
> We have a pretty big medical software which is originally created using
> ITK 3.20. Now we are interested in upgrading it to use the newest ITK
> version. We mainly use functions related to 3D volume processing (affine
> transformation etc) and data input/output. There are some new nice features
> in ITK4 that we want to use, such as MRI bias correction.
>
> I already tried simply replacing the old ITK with the current one (4.4.2)
> and rebuilding everything from the source codes, but that didn't work (not
> that I even expected it to work this way). There seem to be some now
> obsolete functions/methods in ITK 3.2 and other issues I just need go
> through and fix one by one manually.
>
> However, before I start editing our software I would be grateful to hear
> any advice and other experiences about similar job. Our software contains
> about 400 C++ files and 200 000+ lines of code (not including ITK code), so
> there will be a lot of work to do with this upgrade. Specifically I would
> like to hear comments on the following questions:
>
>  x How much work is expected? I mean, are there many functions/methods in
> ITK 3.2 that do not exist anymore in the modern ITK releases or are called
> in a different way? Would it be possible to perform the upgrade in just a
> few days or should I book several weeks for the job (obviously this depends
> heavily on how our software is built internally)?
>
>  x What are the main known differences between those ITK versions that I
> should be aware of? Where will I face the biggest problems?
>
>  x Are there any functions that are protected by patents in ITK 4 but are
> free-for-all in ITK 3.2? Our software is commercial, so we don't and won't
> use any patented components.
>
> I know there's a backward compatibility option in building ITK 4 but we
> don't really want to use it. We prefer to rewrite our code to work directly
> with ITK 4 instead.
>
> Thanks!
>
> / Harri
>
>
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-- 
Brian Helba
Medical Imaging
Kitware, Inc.
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