ITK 5.4.3 Release Notes

We are pleased to announce the release of ITK 5.4.3, the latest maintenance update for this cross-platform, open-source toolkit supporting N-dimensional scientific image analysis with spatially-aware algorithms. 🎉 🍻 🥳 This patch release addresses several key issues identified since ITK 5.4.2 while maintaining API stability.

🔦 Highlights

As a maintenance update following 5.4.2, version 5.4.3 incorporates critical improvements including:

  • Bug Fixes: Resolved issues affecting the default number of threads, particularly in multi-threaded image processing pipelines where thread limits were not respected, and corrected the b-spline size calculation for closed parametric dimensions, ensuring accurate interpolation in applications such as 3D image registration and deformation modeling.

  • License Fixes: Removed unused VNL Netlib rpoly files to ensure compliance with our Apache 2.0 licensing requirements.

  • Software Guide Updates: Spelling corrections for the ITK Software Guide.

  • Doxygen Documentation: Updated Doxygen documentation to reflect the latest changes and improvements in ITK, including links to the ReadTheDocs site.

  • Remote Module Updates: Improvements to the LabelErodeDilate and MeshToPolyData remote modules, including bug fixes and enhancements.

A full list of changes can be found in the changelog below.

🔢 Versioning Note

For comprehensive details on ITK 5.4.0, please review the ITK 5.4.0 Release Notes.

💾 Download

Python Packages

Install ITK Python packages with:

pip install itk

Guide and Textbook

Library Sources

Testing Data

Unpack optional testing data in the same directory where the Library Source is unpacked.

Checksums and Signatures

🙏 Congratulations

Congratulations and thank you to everyone who contributed to this release.

🗣️ What’s Next

ITK 6 Preparation

The development community is currently focused on delivering ITK 6, a major modernization release featuring:

  • Architectural upgrades for contemporary C++ development

  • Enhanced template metaprogramming capabilities

  • Streamlined build system configurations

Early access builds (alpha/beta releases) will become available during ongoing 5.4.x maintenance, enabling parallel evaluation of new features while maintaining production stability.

5.4 Maintenance Commitment

We remain dedicated to supporting current users through:

  • Regular security and regression patches

  • Critical bug resolution

  • Platform compatibility updates

Enjoy ITK!

ITK Changes Since v5.4.2

Bradley Lowekamp (2):

Enhancements

  • Use get_schedaffin to determine number of threads (50ab3e0f6e)

Bug Fixes

  • Update LabelErodeDilate remote module (ea1ee3a961)

Dženan Zukić (1):

Documentation Updates

  • Remove duplicate new author name (Matthieu LAURENDEAU) (6d82d2bd8f)

Matthew McCormick (10):

Enhancements

Documentation Updates

  • Update maintenance branch for 5.4 series (146bc6de06)

  • Point to RTD Doxygen documentation, ITKDoxygen Docker build (8ba1cfc8f2)

  • Update Doxygen class links to use ReadTheDocs (d3189c245e)

  • Update versioned Doxygen links to point to ReadTheDocs (ce4fa184e8)

  • ITK 5.4.0 release notes (f2852f6ee9)

  • Add ITK 5.4.2 release notes (f817e2f775)

Platform Fixes

  • Bump MeshToPolyData Remote Module to 2024-03-14 main (7366509c1c)

Bug Fixes

  • Remove VNL Netlib rpoly files (6894a1715c)

  • Clamp GlobalDefault threads with GlobalMaximum with initialization (7e485eac71)

Simon Rit (1):

Bug Fixes

  • Remove check on WrapITK.pth existence in itk_python_add_test (71d5cce482)

Nick Tustison (1):

Bug Fixes

  • Incorrect size for closed parametric dimension. (0dd02ac9f1)

ITK Software Guide Changes Since v5.4.2

Matthew McCormick (1):

Enhancements

albert-github (1):

Documentation Updates

Remote Module Changes Since v5.4.2

LabelErodeDilate:

Bradley Lowekamp (4):

Bug Fixes

  • Addressed memory leak of progress object (05a0a1c)

  • Address uninitialized value (921aaab)

  • Fix Valgrind defect with uninitialized array in doOneDimensionErode (b9567df)

Miscellaneous Changes

  • Update CI infrastructure to use 5.4.2 infrastructure (c9f9037)

Hans Johnson (4):

Enhancements

  • Update to support the clang-format-linter CI (b25c27e)

  • Update to use local error message. (22d8846)

Style Changes

  • Add itkVirtualGetNameOfClassMacro + itkOverrideGetNameOfClassMacro (6a892cd)

  • Update to match clang-format-19 from ITK (32e7773)

Jon Haitz Legarreta Gorroño (12):

Enhancements

  • Transition project configuration to pyproject.toml (8197f14)

  • Initialize all arrays in LabelSetUtils.h file (108b0ba)

Platform Fixes

  • Bump to minimum CMake 3.16.3 (f247673)

Style Changes

  • Conform to ITK style guidelines in local variable naming (61c7a93)

  • Do no use m_ to start function parameter names (c347f23)

  • Use medial capitals for variable naming in C++ code (518fab1)

  • Use ITK_TRY_EXPECT_NO_EXCEPTION macro in tests (5f37494)

  • Make the input argument checking be the first task in tests (1a5febf)

  • Conform to ITK style guidelines in test arg check (7f9ffc7)

  • Remove unnecessary brackets around EXIT_FAILURE (02de4bd)

  • Remove unreachable break after return statement (0fbfa1c)

  • Remove unnecessary/empty comment statements in tests (276b195)

MeshToPolyData:

Dženan Zukić (1):

Platform Fixes

  • ITK_DISALLOW_COPY_AND_ASSIGN -> ITK_DISALLOW_COPY_AND_MOVE (b866a68)

Hans Johnson (7):

Enhancements

  • Use latest actions, do not pin to latest version (8aed3c7)

  • Use tag v5.4.2 for the build packages tags (9c0209b)

Style Changes

  • Add itkVirtualGetNameOfClassMacro + itkOverrideGetNameOfClassMacro (c3c0006)

  • Replace itkStaticConstMacro with static constexpr (86435bd)

  • CoordRepType -> CoordinateType code readability (d90e542)

  • Update to match clang-format-19 from ITK (6aa2abf)

  • Fix KWStyleError (597c780)

Jon Haitz Legarreta Gorroño (1):

Platform Fixes

  • Bump to minimum CMake 3.16.3 (97c575f)

Matt McCormick (12):

Enhancements

  • Bump itk-wasm to 1.0.0-b.173 (08779a7)

  • Bump itk-wasm version to 1.0.0-b.175 (254a24d)

  • Add VTK C++ conversion example (8153ecc)

  • Update ITK to 5.4.0 (4ce9813)

  • Bump wasm package version to 1.1.1 (a9d1fd7)

  • Bump pnpm to 10.6.2 (bd893e4)

  • Update pyproject.toml for 0.11.1 (8941ee1)

Documentation Updates

  • Lines to Vertices in method description (ff3cc60)

Platform Fixes

  • Provide backwards compatible CoordRepType in itk::PolyData (c9e0aba)

  • Update wasm for ITK 5.4.2 (1c2a0b5)

Bug Fixes

  • Update Python package version to 0.11.0 (5e8de5d)

  • Support Variable-Length-Vector in mesh-to-polydata (e9b30dc)

dependabot[bot] (2):

Miscellaneous Changes

  • Bump vite from 4.5.3 to 4.5.6 (02b88a3)

  • Bump esbuild from 0.19.12 to 0.25.0 (edf43cb)