Proposal to implement Python support for custom stream sources in G-API

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Hi OpenCV team,

I came across the GSoC 2023 idea nr 15 titled “G-API: Implement custom stream sources in Python”, and I found it very interesting and still relevant. I searched through the repository and it seems that this feature hasn’t been implemented yet.

I’m a Bachelor’s student in Computer Science and I’d like to contribute this feature to OpenCV as an external contributor (outside of GSoC). I believe it’s a valuable addition, especially for Python developers using G-API with their own custom data sources.

From what I understand, the main steps would be:

  • Implementing a C++ proxy class that delegates to a Python-defined source,
  • Exposing this to Python using pybind11,
  • Writing tests and (ideally) a short example or tutorial.

The key point, of course, would be to discuss and agree on the Python API: how should the user define and register their custom source? I’d be happy to propose something and iterate on your feedback.

Could I go ahead and work on this feature? Would someone from the G-API team be willing to help validate the design?

Thanks in advance!
Rita Melo

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recently I learned that the G-API is going to get exiled to contrib.

maybe you can still spin a GSoC out of it. IDK. I’m not one of the core devs.

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I recommend you to create an issue in the opencv repo. If it attracts the attention of OpenCV core developers, they will get back to you.

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