Hisao Kumakura
R & D IT Japan & APAC at 3M
Japan
Summary
👤
Senior🎓
Top SchoolHisao Kumakura is an R&D IT leader at 3M Japan & APAC with over 20 years of cross-disciplinary experience bridging product development, analytical chemistry, and IT innovation. Currently pursuing an MBA in Business Strategy & Innovation Management at Waseda, he combines technical depth from an applied physics background with strategic insight to drive lab productivity and regional R&D IT initiatives. A long-term contributor to OpenCV and its contrib modules, he has hands-on experience improving image-processing codepaths, codecs, and text-rendering pipelines—work that supports one of the most widely used computer vision libraries. Known for practical problem-solving, he has a track record of refactoring legacy systems, fixing hard-to-reproduce bugs, and modernizing code to C++20 standards. Colleagues rely on him to translate complex scientific requirements into maintainable engineering solutions across Japan and the APAC region.
9 years of coding experience
MBA, Business Strategy & Innovation Management, MBA, Business Strategy & Innovation Management at Waseda UniversityBachelor, Applied Physics, Bachelor, Applied Physics at Keio University
Github Skills (14)
computer-vision10
opencv10
c-language10
cprogramming-language10
freetype10
harfbuzz10
image-processing10
jpeg9
tiff9
openexr8
c117
wayland7
c177
text-recognition7
Programming languages (1)
Github contributions (5)
opencv/opencv_contrib
Dec 2016 - Jun 2022
Repository for OpenCV's extra modules
Role in this project:
Back-end Developer
Back-end DeveloperContributions:13 reviews, 8 commits, 18 PRs in 5 years 7 months
Contributions summary:Hisao primarily contributed to the `freetype` module within the OpenCV contrib repository. Their work involved fixing issues related to text rendering with FreeType, specifically addressing overflow problems and refining the call sequence for Harfbuzz. The user also modified the handling of character whitelists in the text module and provided fixes for review. Furthermore, there were changes related to supporting C++20 standards.
pythoncmakecppcomputer-vision
opencv/opencv
May 2022 - Oct 2022
Open Source Computer Vision Library
Role in this project:Software Engineer
Software EngineerContributions:140 reviews, 5 commits, 80 PRs in 4 months
Contributions summary:Hisao primarily contributed to the OpenCV library by addressing various issues and improving its functionality. Their work included enhancing the Qt backend for keyboard input, updating documentation for image codecs to support different image formats, and fixing a bug in video input related to FFMPEG. They also worked on fixing compiler warnings, refining EXR tests, and refactoring the JPEG encoder. Additionally, the user made improvements to the persistence module.
pythonvisiondeep-learningc-plus-pluscomputer-vision
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.