InsightSoftwareConsortium/ITK

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Insight Toolkit (ITK) -- Official Repository. ITK builds on a proven, spatially-oriented architecture for processing, segmentation, and registration of scientific images in two, three, or more dimensions.

Stars: 1.7k
Forks: 749
Open beginner issues: 0
Indexed issues: 347
Avg merge: 1d 1h
Merged PRs (30d): 64

Dominant language: C++
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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347 open issues indexed

External modules cannot wrap itkPyBuffer.h: Python include dir is not exported Open

Difficulty 4/5 3-5 days Newbie friendliness 65/100

InsightSoftwareConsortium/ITK#6865 · 2 comments · 1 reaction · Opened Sep 16, 2026
typing.get_type_hints() on wrapped filters fails on Python 3.14 (itkTemplate | TypeAliasType) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

InsightSoftwareConsortium/ITK#6863 · Opened Sep 16, 2026
Factory registration include directory collides between targets in one project Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

InsightSoftwareConsortium/ITK#6860 · 6 comments · 1 reaction · Opened Sep 13, 2026
ITK 5.4.8 tag? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6859 · 4 comments · 3 reactions · Opened Sep 11, 2026
Errors in overnight documentation build Open

type:Documentation

Difficulty 4/5 3-5 days Newbie friendliness 30/100

InsightSoftwareConsortium/ITK#6858 · 2 comments · Opened Sep 11, 2026
MetaIO: ten memory-safety defects reachable from a malformed header (Kitware/MetaIO#150) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6853 · Opened Sep 7, 2026
Future consideration: are the ITKVtkGlue Python typemaps still needed, given the numpy bridge? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

InsightSoftwareConsortium/ITK#6847 · 1 comment · Opened Sep 6, 2026
Investigate a Ruff EXE gate for shebangs, and Ruff as consolidation for black/pyupgrade Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6845 · Opened Sep 5, 2026
Cannot detect a transform file's stored parameter precision without fully reading it Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

InsightSoftwareConsortium/ITK#6830 · 1 comment · Opened Sep 2, 2026
NiftiImageIO: streamed region read of a multi-component image corrupts the heap and aborts Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

InsightSoftwareConsortium/ITK#6827 · Opened Sep 2, 2026
SimpleITK conversion silently drops LargestPossibleRegion when the buffered region is smaller Open

Difficulty 3/5 Half a day Newbie friendliness 74/100

InsightSoftwareConsortium/ITK#6826 · 2 comments · 1 reaction · Opened Sep 1, 2026
NarrowBandImageFilterBase reads m_RegionList out of bounds when the band has fewer nodes than work units Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

InsightSoftwareConsortium/ITK#6823 · Opened Aug 31, 2026
Problems with NRRD IO writing ".nhdr" Open

type:Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

InsightSoftwareConsortium/ITK#6820 · Opened Aug 30, 2026
Vendored libraries share a SONAME, so two ITK builds cross-bind on Linux Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6819 · 1 comment · Opened Aug 29, 2026
Fuzz the IO readers: untrusted file parsers have no fuzzing and no sanitizer CI leg Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

InsightSoftwareConsortium/ITK#6818 · 1 comment · Opened Aug 28, 2026
ImageIOBase validates geometry indices but never values, and the image-size multiplication is unchecked Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6817 · 1 comment · Opened Aug 28, 2026
VTK legacy reader: COLOR_SCALARS component count is used unvalidated Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

InsightSoftwareConsortium/ITK#6816 · Opened Aug 28, 2026
Stimulate reader: unbounded numDim causes out-of-bounds stack reads of header arrays Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

InsightSoftwareConsortium/ITK#6815 · Opened Aug 28, 2026
Bruker 2dseq reader does not validate file-controlled sizes before indexing and allocating Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

InsightSoftwareConsortium/ITK#6813 · Opened Aug 28, 2026
Python: GetMetaDataDictionary() on a temporary image segfaults (use-after-free) Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

InsightSoftwareConsortium/ITK#6812 · Opened Aug 27, 2026
NrrdImageIO does not stream: a small region costs a whole volume decode Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

InsightSoftwareConsortium/ITK#6805 · 4 comments · Opened Aug 26, 2026
Consolidate duplicated test-helper macros (`TEST_INITIALIZATION_ERROR` x6, `CHECK_FOR_VALUE` x3, ...) Open

type:Style type:Testing

Difficulty 4/5 3-5 days Newbie friendliness 52/100

InsightSoftwareConsortium/ITK#6790 · Opened Aug 24, 2026
Installed headers leak 44 unprefixed macros into consumer translation units (`COPY`, `RAISE_EXCEPTION`, `NOMINMAX`, ...) Open

area:Core area:IO type:Bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

InsightSoftwareConsortium/ITK#6789 · 1 reaction · Opened Aug 24, 2026
Consolidate stringify macros: 34 duplicate definitions (`_STRING`/`TOSTRING` + `ITK_VERSION_TO_STRING`) Open

area:Core type:Style type:Testing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6788 · 1 comment · Opened Aug 24, 2026
Design: build-configurable ITK namespace — adopt VTK-style ABI inline namespace rather than `#define itk` Open

area:Core area:Python wrapping area:ThirdParty type:Design

Difficulty 5/5 Over a week Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6786 · 8 comments · 1 reaction · Opened Aug 24, 2026
GoogleTest integration is inconsistent between build tree and install tree Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

InsightSoftwareConsortium/ITK#6781 · Opened Aug 21, 2026
Review whether ITK_USE_64BITS_IDS is still needed Open

area:Core area:Python wrapping type:Design

Difficulty 5/5 Over a week Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6774 · 5 comments · 1 reaction · Opened Aug 20, 2026
Roadmap: free-threaded CPython, abi3t, and alternative Python binding generators Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6757 · 1 comment · Opened Aug 5, 2026
Investigate adopting factoryless instance creation for BoundingBox, VectorContainer and ScalableAffineTransform (carried downstream by MITK) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6755 · 1 comment · Opened Jul 31, 2026
COMP: Remove the retired cloudflare-ipfs.com ExternalData mirror Open

type:Infrastructure

Difficulty 1/5 Under an hour Newbie friendliness 90/100

InsightSoftwareConsortium/ITK#6754 · 2 reactions · Opened Jul 30, 2026
COMP: Implement the Phase-3 equivalence check in rewrite-history-merge-preserving.py Open

type:Infrastructure

Difficulty 3/5 1-2 days Newbie friendliness 74/100

InsightSoftwareConsortium/ITK#6753 · Opened Jul 30, 2026
DOC: Document two silent refactoring hazards — declare-then-init construction and const-addition overload changes Open

area:Documentation type:Documentation

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

InsightSoftwareConsortium/ITK#6752 · Opened Jul 30, 2026
STYLE: Complete the declare-then-assign sweep beyond #6014's 42 files Open

type:Style

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6751 · Opened Jul 30, 2026
ENH: Add a NIfTI scl_slope metadata-precision regression test (follow-up to #6003) Open

area:IO type:Testing

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

InsightSoftwareConsortium/ITK#6750 · Opened Jul 30, 2026
COMP: Decide the x86-64 microarchitecture baseline for distributed ITK packages (sibling of #6745) Open

type:Compiler type:Infrastructure

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6749 · Opened Jul 30, 2026
COMP: Drop the DCMTK `offile.h` printf-format overlay once DCMTK/dcmtk#151 merges Open

type:Infrastructure

Difficulty 4/5 3-5 days Newbie friendliness 25/100

InsightSoftwareConsortium/ITK#6748 · Opened Jul 29, 2026
COMP: Mirror CastXML binaries with multi-URL fallback (SWIG/PCRE already done) Open

area:Python wrapping type:Infrastructure

Difficulty 4/5 3-5 days Newbie friendliness 55/100

InsightSoftwareConsortium/ITK#6747 · Opened Jul 29, 2026
PERF: Restructure `BSplineTransform::TransformPoint` inner loop for a SIMD-friendly gather pattern Open

area:Registration type:Performance

Difficulty 5/5 Over a week Newbie friendliness 42/100

InsightSoftwareConsortium/ITK#6746 · 1 reaction · Opened Jul 29, 2026
PERF: Quantify `-mprefer-vector-width=256` as a required companion to `-march=x86-64-v4` Open

type:Infrastructure type:Performance

Difficulty 5/5 Over a week Newbie friendliness 42/100

InsightSoftwareConsortium/ITK#6745 · 1 comment · Opened Jul 29, 2026
DOC: Formalize ITK policy for use of `auto` Open

area:Documentation type:Documentation

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

InsightSoftwareConsortium/ITK#6744 · 1 reaction · Opened Jul 29, 2026
ENH: Migrate two-argument `Transform*Point` call sites to the return-value overloads Open

type:Enhancement type:Style

Difficulty 4/5 3-5 days Newbie friendliness 52/100

InsightSoftwareConsortium/ITK#6743 · Opened Jul 29, 2026
DOC: Audit git history for undocumented API changes; add a ModernizationGuide Open

area:Documentation type:Documentation

Difficulty 5/5 Over a week Newbie friendliness 35/100

InsightSoftwareConsortium/ITK#6742 · 1 reaction · Opened Jul 29, 2026
PERF: Benchmark and tune the hard-coded `itk::Math::SVD` algorithm-selection thresholds Open

area:Numerics type:Enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

InsightSoftwareConsortium/ITK#6741 · Opened Jul 29, 2026
COMP: Audit ITK's compiler warning flags and suppressions for the C++17 era Open

type:Compiler type:Infrastructure

Difficulty 5/5 Over a week Newbie friendliness 38/100

InsightSoftwareConsortium/ITK#6740 · Opened Jul 29, 2026
ENH: Route ImageIO file opens through `itkInternationalizationIOHelpers` for non-ASCII Windows filenames (Tier B) Open

area:IO type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 52/100

InsightSoftwareConsortium/ITK#6739 · 1 comment · Opened Jul 29, 2026
STYLE: Prefer `std::fabs` in float-only test contexts and add a tolerance-parameterized test macro Open

type:Enhancement type:Testing

Difficulty 4/5 3-5 days Newbie friendliness 48/100

InsightSoftwareConsortium/ITK#6738 · 1 reaction · Opened Jul 29, 2026
COMP: Nightly warning backlog — `-Wlifetime-safety-invalidation`, `-Wnrvo`, `-Waggressive-loop-optimizations`, `-Wallocator-wrappers` Open

type:Compiler type:Infrastructure

Difficulty 4/5 3-5 days Newbie friendliness 45/100

InsightSoftwareConsortium/ITK#6737 · Opened Jul 29, 2026
COMP: Right-size CTest timeouts — Debug vs optimized defaults, multi-config Debug legs, and outlier tests Open

type:Infrastructure type:Testing

Difficulty 5/5 Over a week Newbie friendliness 42/100

InsightSoftwareConsortium/ITK#6736 · Opened Jul 29, 2026
ENH: Exercise every enabled FFT precision in the 1D FFT tests (not an either/or single pick) Open

area:Filtering type:Testing

Difficulty 4/5 3-5 days Newbie friendliness 68/100

InsightSoftwareConsortium/ITK#6735 · Opened Jul 29, 2026
ENH: Give `itkCurvatureRegistrationFilter` a single-precision (fftwf_*) r2r/DCT path Open

area:Filtering area:Registration type:Enhancement

Difficulty 4/5 3-5 days Newbie friendliness 66/100

InsightSoftwareConsortium/ITK#6734 · Opened Jul 29, 2026

InsightSoftwareConsortium/ITK

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