Niels Dekker
Scientific Programmer at Leiden University Medical Center
Amsterdam, North Holland, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolNiels Dekker is a scientific programmer based in Amsterdam with nine years of focused experience delivering high-performance image processing software for medical research. He combines deep C++ expertise and modern memory-safe practices with hands-on optimization work, notably improving performance and exception safety in the widely used Insight Toolkit (ITK) and enhancing Elastix integration in SimpleITK. At Leiden University Medical Center he applies this toolkit-level knowledge to real radiology imaging problems, bridging research needs and production-quality code. His background spans embedded Windows and Unix systems, desktop viewers, and clinical acquisition software, reflecting a pragmatic approach to heterogeneous environments. Colleagues appreciate that he not only accelerates algorithms but also systematically hardens code (e.g., fixing critical assignment bugs and replacing raw pointers with unique_ptr). He brings a steady, research-oriented engineering mindset that scales from low-level performance tweaks to maintainable scientific libraries.
9 years of coding experience
10 years of employment as a software developer
MSc, Computer Science, MSc, Computer Science at Vrije Universiteit Amsterdam (VU Amsterdam)
Stackoverflow
51reputation
3kreached
4answers
0questions
Github Skills (22)
algorithm10
code-optimization10
algorithms10
c-language10
image-processing10
performance-optimization10
optimisation10
cplus10
itk10
numerical-optimization10
cpp10
cprogramming-language10
optimization10
testing9
refactor9
Programming languages (15)
Github contributions (5)
InsightSoftwareConsortium/ITK
Jun 2017 - Jan 2023
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.
Role in this project:
Back-end Developer & Performance Engineer
Back-end Developer & Performance EngineerContributions:1410 reviews, 595 commits, 886 PRs in 5 years 8 months
Contributions summary:Niels primarily focused on optimizing the performance of the library's core image processing functionalities. Their contributions include refactoring and improving the performance of `GaussianDerivativeImageFunction` by using `ShapedImageNeighborhoodRange`, which in turn, improved the performance of the `HoughTransform2DCirclesImageFilter`. They also refactored code to improve exception safety and memory management by using modern C++ features. Further optimizations were made to other filters as well, by calling `ImageAlgorithm::Copy` and utilizing the faster `TransformPhysicalPointToIndex` overload.
itksegmentationinsight-toolkitimage-analysismedical-imaging
SimpleITK/SimpleITK
Feb 2022 - Oct 2022
SimpleITK: a layer built on top of the Insight Toolkit (ITK), intended to simplify and facilitate ITK's use in rapid prototyping, education and interpreted languages.
Role in this project:Backend Developer
Backend DeveloperContributions:39 reviews, 9 commits, 6 PRs in 7 months
Contributions summary:Niels primarily focused on enhancing the `ElastixImageFilter` and `TransformixImageFilter` within the SimpleITK library. Their contributions include implementing features to integrate Elastix components, refactoring code to use `unique_ptr` for improved memory management, and fixing a critical bug related to the `GenericException` class's assignment operator, preventing potential crashes. Additionally, the user improved code maintainability by removing include guards and adding doxygen comments.
interpreted-languageitkrapid-prototypingsimpleitkc-plus-plus
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