scikit-image/scikit-image
Nov 2024 – Apr 2026
17 Months active
Languages Used
CythonPythonShellYAMLTextNumPySciPypytest
Technical Skills
API DesignBuild SystemsCI/CDCode RefactoringCode RevertDocumentation
Lars Grüter
PROFILE
Lars Grüter
Contributed extensively to the scikit-image/scikit-image repository, delivering 38 features and 22 bug fixes over 17 months. Focused on API modernization, CI/CD stability, and migration readiness, this work included deprecating legacy interfaces, unifying parameter naming, and introducing new APIs for image processing and morphology. Leveraged Python, Cython, and YAML to streamline build automation, enhance test reliability, and improve documentation clarity. Addressed cross-platform compatibility and performance by refining workflows and dependency management. The technical approach emphasized maintainability, clear migration pathways, and robust testing, resulting in a more modular, stable, and user-friendly codebase for both developers and downstream projects.
Overall Statistics
Feature vs Bugs
63%Features
Repository Contributions
114Total
Bugs
22
Commits
114
Features
38
Lines of code
174,805
Activity Months17
Your Network
194 peopleWork History
April 2026
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered a major repository restructure for scikit-image by renaming the internal _shared module to _skimage2 and updating imports, signaling a move toward improved modularity and clearer versioning. This foundation enables easier maintenance, smoother releases, and faster onboarding for new contributors.
1 Commits • 1 Features
Apr 1, 2026April 2026: Delivered a major repository restructure for scikit-image by renaming the internal _shared module to _skimage2 and updating imports, signaling a move toward improved modularity and clearer versioning. This foundation enables easier maintenance, smoother releases, and faster onboarding for new contributors.
April 2026
March 2026
8 Commits • 4 Features
Mar 1, 2026March 2026 focused on delivering a modernized skimage2 surface, stabilizing APIs, and tightening CI/CD hygiene to reduce maintenance costs and accelerate adoption. Key features include a new rescaling API and footprint utilities, while a critical bug fix aligned dilation behavior with SciPy and improved test coverage. Packaging and import hygiene improvements reduce warnings and import-time coupling, enhancing long-term maintainability and business value.
March 2026
8 Commits • 4 Features
Mar 1, 2026March 2026 focused on delivering a modernized skimage2 surface, stabilizing APIs, and tightening CI/CD hygiene to reduce maintenance costs and accelerate adoption. Key features include a new rescaling API and footprint utilities, while a critical bug fix aligned dilation behavior with SciPy and improved test coverage. Packaging and import hygiene improvements reduce warnings and import-time coupling, enhancing long-term maintainability and business value.
February 2026
4 Commits • 4 Features
Feb 1, 2026February 2026 performance summary for scikit-image/scikit-image: Delivered major feature work across labeling, blob processing, peak detection, and morphology, with a focus on clarity, usability, and cross-namespace consistency. These changes streamline data labeling, simplify blob-related processing, enhance peak detection flexibility in skimage2, and unify grayscale morphology across namespaces.
4 Commits • 4 Features
Feb 1, 2026February 2026 performance summary for scikit-image/scikit-image: Delivered major feature work across labeling, blob processing, peak detection, and morphology, with a focus on clarity, usability, and cross-namespace consistency. These changes streamline data labeling, simplify blob-related processing, enhance peak detection flexibility in skimage2, and unify grayscale morphology across namespaces.
February 2026
January 2026
11 Commits • 2 Features
Jan 1, 2026January 2026 focused on API stability and migration readiness in scikit-image, delivering two major initiatives through coordinated deprecation work, namespace evolution, and tooling enhancements.
January 2026
11 Commits • 2 Features
Jan 1, 2026January 2026 focused on API stability and migration readiness in scikit-image, delivering two major initiatives through coordinated deprecation work, namespace evolution, and tooling enhancements.
December 2025
12 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for scikit-image/scikit-image highlighting business value and technical achievements. Focused on hardening release processes for 0.26 RC and improving stability of macOS CI and test suites, with emphasis on efficiency, clarity, and cross-team collaboration.
12 Commits • 1 Features
Dec 1, 2025December 2025 monthly summary for scikit-image/scikit-image highlighting business value and technical achievements. Focused on hardening release processes for 0.26 RC and improving stability of macOS CI and test suites, with emphasis on efficiency, clarity, and cross-team collaboration.
December 2025
November 2025
9 Commits • 1 Features
Nov 1, 2025November 2025 (2025-11) Monthly summary for scikit-image/scikit-image focused on CI/CD stability, build environment readiness for Pyodide, and cross‑platform testing. Delivered a cohesive set of CI/CD and workflow improvements that enhanced reliability, reduced log noise, and accelerated feedback for releases. The changes also improved dependency handling, doctest output clarity, and multi-arch macOS coverage, aligning development and release workflows with performance and scalability goals.
November 2025
9 Commits • 1 Features
Nov 1, 2025November 2025 (2025-11) Monthly summary for scikit-image/scikit-image focused on CI/CD stability, build environment readiness for Pyodide, and cross‑platform testing. Delivered a cohesive set of CI/CD and workflow improvements that enhanced reliability, reduced log noise, and accelerated feedback for releases. The changes also improved dependency handling, doctest output clarity, and multi-arch macOS coverage, aligning development and release workflows with performance and scalability goals.
October 2025
7 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 (scikit-image/scikit-image) Key features delivered: - Documentation/navigation performance improvement: disabled smooth scrolling for in-page anchors to speed navigation. Commit: 9e1086fc8c93406797cf99ac72f59f753fe38a2f. Major bugs fixed: - CI stability and dependency management: excluded Cython 3.2.x across configs and dependencies; added 60-minute timeouts to wheels/build jobs to prevent long-running CI tasks; and mitigated flaky tests (e.g., skipping test_max_tree.py for Cython 3.2.0b1). Commits: 42c714cdc87f904eda86bf08d7174f1b2a24c6cc; bdedf749fdcef5ca9a2a673564b952ed5708e9e1; cc6f98c1c42daac61c57f8c017eb74e73b7b516b; 165fba087e8bda82458bf6ec905e86f15811c5e0; a3fa2729125b00e30f02eeeeece972afa92ce70f. - Deterministic eigenvalue computation fix: ensure deterministic eigenvalue computation by passing rng to SciPy's linalg.eigsh when SciPy >= 1.17.0.dev0. Commit: bf6f38c2ef2b20646337916cc11e9c3d072041cf. Overall impact and accomplishments: - Increased CI reliability and speed, reduced flaky failures, and improved numerical reproducibility; smoother doc navigation user experience and faster feedback for developers. Technologies/skills demonstrated: - CI/CD configuration (cibuildwheel), Python packaging, Cython version management, test stabilization, and SciPy/NumPy numerical reproducibility.
7 Commits • 1 Features
Oct 1, 2025Monthly summary for 2025-10 (scikit-image/scikit-image) Key features delivered: - Documentation/navigation performance improvement: disabled smooth scrolling for in-page anchors to speed navigation. Commit: 9e1086fc8c93406797cf99ac72f59f753fe38a2f. Major bugs fixed: - CI stability and dependency management: excluded Cython 3.2.x across configs and dependencies; added 60-minute timeouts to wheels/build jobs to prevent long-running CI tasks; and mitigated flaky tests (e.g., skipping test_max_tree.py for Cython 3.2.0b1). Commits: 42c714cdc87f904eda86bf08d7174f1b2a24c6cc; bdedf749fdcef5ca9a2a673564b952ed5708e9e1; cc6f98c1c42daac61c57f8c017eb74e73b7b516b; 165fba087e8bda82458bf6ec905e86f15811c5e0; a3fa2729125b00e30f02eeeeece972afa92ce70f. - Deterministic eigenvalue computation fix: ensure deterministic eigenvalue computation by passing rng to SciPy's linalg.eigsh when SciPy >= 1.17.0.dev0. Commit: bf6f38c2ef2b20646337916cc11e9c3d072041cf. Overall impact and accomplishments: - Increased CI reliability and speed, reduced flaky failures, and improved numerical reproducibility; smoother doc navigation user experience and faster feedback for developers. Technologies/skills demonstrated: - CI/CD configuration (cibuildwheel), Python packaging, Cython version management, test stabilization, and SciPy/NumPy numerical reproducibility.
October 2025
September 2025
23 Commits • 5 Features
Sep 1, 2025September 2025 (2025-09) focused on stabilizing the test suite, improving packaging compatibility, and delivering docs/navigation quality improvements for scikit-image. Key features delivered included Pytest output improvements for Pyodide packaging, restoration of fast in-page navigation, packaging enhancements for newer manylinux_2_28 images, and debugging enhancements via a readable __repr__ for RegionProperties. Major CI and test stability work reduced flaky tests and improved cross-environment reliability. This work delivered measurable business value through faster, more reliable CI feedback, broader platform support, and clearer debugging information for developers.
September 2025
23 Commits • 5 Features
Sep 1, 2025September 2025 (2025-09) focused on stabilizing the test suite, improving packaging compatibility, and delivering docs/navigation quality improvements for scikit-image. Key features delivered included Pytest output improvements for Pyodide packaging, restoration of fast in-page navigation, packaging enhancements for newer manylinux_2_28 images, and debugging enhancements via a readable __repr__ for RegionProperties. Major CI and test stability work reduced flaky tests and improved cross-environment reliability. This work delivered measurable business value through faster, more reliable CI feedback, broader platform support, and clearer debugging information for developers.
July 2025
8 Commits • 3 Features
Jul 1, 2025July 2025 (scikit-image/scikit-image) delivered concrete improvements to CI, stability, documentation, and developer experience, with a clear focus on maintainability and reliability. Key features delivered and fixes: - CI workflow for docstub type stubs: added a Continuous Integration workflow to generate type stubs with docstub, configure dependencies, and upload generated stubs as artifacts, ensuring alignment with main and test stability. Commits include e3c37269a5432e69e38c5bddc3049e1bf53523dc and 487d3d69561325f09c447077b50705a173e322b7. - Deterministic RANSAC example for reliable plotting: seeded randomness to make RANSAC estimation deterministic in the plot_stitching example, reducing CI flakiness. Commit 380b13cf1ff01159507877230dc6326ef5cfb48a. - PendingSkimage2Change warning for API changes: introduced a new warning to alert users about upcoming skimage2 API changes and updated migration guidance. Commit c5619593125285f824902a8f7c0fc5300f05f32d. - Documentation and test suite improvements: improved docs and tests, refined docstrings and type hints, fixed docstub typos, renamed test helpers for consistency, and corrected items in TODO.txt. Commits include 29c25dac8969eb3d5c761017a1451354228109bd, 84b8f50e152f76b0443fc4ce4e7f7dead587870a, 80b76b0a2643a307764a520b84435ec61dc6da33, f7a9fbba6ab107a88236c9a0036ae2baae36eac2.
8 Commits • 3 Features
Jul 1, 2025July 2025 (scikit-image/scikit-image) delivered concrete improvements to CI, stability, documentation, and developer experience, with a clear focus on maintainability and reliability. Key features delivered and fixes: - CI workflow for docstub type stubs: added a Continuous Integration workflow to generate type stubs with docstub, configure dependencies, and upload generated stubs as artifacts, ensuring alignment with main and test stability. Commits include e3c37269a5432e69e38c5bddc3049e1bf53523dc and 487d3d69561325f09c447077b50705a173e322b7. - Deterministic RANSAC example for reliable plotting: seeded randomness to make RANSAC estimation deterministic in the plot_stitching example, reducing CI flakiness. Commit 380b13cf1ff01159507877230dc6326ef5cfb48a. - PendingSkimage2Change warning for API changes: introduced a new warning to alert users about upcoming skimage2 API changes and updated migration guidance. Commit c5619593125285f824902a8f7c0fc5300f05f32d. - Documentation and test suite improvements: improved docs and tests, refined docstrings and type hints, fixed docstub typos, renamed test helpers for consistency, and corrected items in TODO.txt. Commits include 29c25dac8969eb3d5c761017a1451354228109bd, 84b8f50e152f76b0443fc4ce4e7f7dead587870a, 80b76b0a2643a307764a520b84435ec61dc6da33, f7a9fbba6ab107a88236c9a0036ae2baae36eac2.
July 2025
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for scikit-image/scikit-image: Delivered migration groundwork for skimage2 and completed key maintenance work to reduce technical debt. No user-facing bug fixes this period; focus was on documentation and code cleanup to improve future migration readiness and maintainability.
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 performance summary for scikit-image/scikit-image: Delivered migration groundwork for skimage2 and completed key maintenance work to reduce technical debt. No user-facing bug fixes this period; focus was on documentation and code cleanup to improve future migration readiness and maintainability.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 – scikit-image RegionProperties API: Implemented deprecation pathway and compatibility warnings to minimize disruption while guiding users toward updated names. Updated PROPS dictionary access patterns and __getattr__/__getitem__ to emit FutureWarning for legacy properties. Added tests to verify deprecation warnings and behavior for old property accesses. This work reduces API breakage risk, improves developer experience, and lays groundwork for future API modernization.
1 Commits • 1 Features
May 1, 2025May 2025 – scikit-image RegionProperties API: Implemented deprecation pathway and compatibility warnings to minimize disruption while guiding users toward updated names. Updated PROPS dictionary access patterns and __getattr__/__getitem__ to emit FutureWarning for legacy properties. Added tests to verify deprecation warnings and behavior for old property accesses. This work reduces API breakage risk, improves developer experience, and lays groundwork for future API modernization.
May 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary focusing on API consistency and parallel execution improvements in the scikit-image project.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary focusing on API consistency and parallel execution improvements in the scikit-image project.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for scikit-image/scikit-image: Implemented API parameter naming consistency for remove_small_objects and remove_small_holes by introducing a max_size parameter, added deprecation warnings for old parameters, and updated documentation and tests to reflect the change. This work enhances API predictability, reduces confusion for downstream users, and lays groundwork for long-term API stability.
1 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for scikit-image/scikit-image: Implemented API parameter naming consistency for remove_small_objects and remove_small_holes by introducing a max_size parameter, added deprecation warnings for old parameters, and updated documentation and tests to reflect the change. This work enhances API predictability, reduces confusion for downstream users, and lays groundwork for long-term API stability.
March 2025
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for scikit-image/scikit-image: Delivered two principal items with clear business value: (1) Documentation terminology standardization for isotropic morphology to use 'footprint' instead of 'neighborhood', aligning with standard morphology terminology and reducing user confusion. (2) Watershed marker handling bug fix: corrected handling of marker heights to avoid negative infinity, ensured lower-region markers have priority, with tests updated to cover edge cases for improved segmentation fairness. Impact: improved documentation clarity and consistency, more reliable marker-based segmentation, and strengthened test coverage. Technologies/skills demonstrated: documentation discipline, algorithm correctness in watershed implementation, and open-source collaboration.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for scikit-image/scikit-image: Delivered two principal items with clear business value: (1) Documentation terminology standardization for isotropic morphology to use 'footprint' instead of 'neighborhood', aligning with standard morphology terminology and reducing user confusion. (2) Watershed marker handling bug fix: corrected handling of marker heights to avoid negative infinity, ensured lower-region markers have priority, with tests updated to cover edge cases for improved segmentation fairness. Impact: improved documentation clarity and consistency, more reliable marker-based segmentation, and strengthened test coverage. Technologies/skills demonstrated: documentation discipline, algorithm correctness in watershed implementation, and open-source collaboration.
January 2025
14 Commits • 5 Features
Jan 1, 2025January 2025 monthly summary for scikit-image: Focused on API discoverability, morphology API modernization, and infrastructure enhancements that improve developer velocity, reliability, and business value. Key deliverables include exposing the centroid API in the measure module to make it visible to type-checkers, deprecating binary_morphology functions in favor of generic morphology APIs, and comprehensive documentation improvements for isotropic morphology. Additional improvements covered documentation tooling and build robustness, CI/dependency management updates, and test-suite tuning to speed feedback. A core stability fix upcasted float16 to float32 in random_walker to ensure compatibility with SciPy sparse matrices, reducing edge-case failures. The month also included maintenance work on tests and benchmarks to trim run times and improve maintainability, along with pre-commit and documentation quality fixes.
14 Commits • 5 Features
Jan 1, 2025January 2025 monthly summary for scikit-image: Focused on API discoverability, morphology API modernization, and infrastructure enhancements that improve developer velocity, reliability, and business value. Key deliverables include exposing the centroid API in the measure module to make it visible to type-checkers, deprecating binary_morphology functions in favor of generic morphology APIs, and comprehensive documentation improvements for isotropic morphology. Additional improvements covered documentation tooling and build robustness, CI/dependency management updates, and test-suite tuning to speed feedback. A core stability fix upcasted float16 to float32 in random_walker to ensure compatibility with SciPy sparse matrices, reducing edge-case failures. The month also included maintenance work on tests and benchmarks to trim run times and improve maintainability, along with pre-commit and documentation quality fixes.
January 2025
December 2024
4 Commits • 2 Features
Dec 1, 2024December 2024: Delivered a unified footprint generation API (footprint_rectangle) with a deprecation plan, improved startup performance via lazy loading of legacy imports in skimage/__init__, and fixed gallery compatibility with newer Matplotlib versions. These changes streamline API usage, reduce startup latency, and enhance cross-version robustness, delivering tangible business value to users and downstream projects.
December 2024
4 Commits • 2 Features
Dec 1, 2024December 2024: Delivered a unified footprint generation API (footprint_rectangle) with a deprecation plan, improved startup performance via lazy loading of legacy imports in skimage/__init__, and fixed gallery compatibility with newer Matplotlib versions. These changes streamline API usage, reduce startup latency, and enhance cross-version robustness, delivering tangible business value to users and downstream projects.
November 2024
6 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for scikit-image development. Focused on stabilizing build pipelines, expanding sparse-matrix API coverage, and improving performance and compatibility across modules. Delivered concrete improvements with measurable impact on CI reliability, API flexibility, and maintainability.
6 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for scikit-image development. Focused on stabilizing build pipelines, expanding sparse-matrix API coverage, and improving performance and compatibility across modules. Delivered concrete improvements with measurable impact on CI reliability, API flexibility, and maintainability.
November 2024
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Quality Metrics
Correctness91.4%
Maintainability91.8%
Architecture87.6%
Performance86.0%
AI Usage21.4%
Skills & Technologies
Programming Languages
BashCSSCythonMarkdownNumPyPythonSciPyShellTOMLText
Technical Skills
API DesignAPI RefactoringAPI StandardizationAPI designAlgorithm DevelopmentAlgorithm ImplementationBenchmarkingBuild AutomationBuild ConfigurationBuild SystemBuild System ConfigurationBuild SystemsCI/CDCSSCode Consolidation
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline