Is it possible to make the class GCGraph available outside GrabCut?

[romanc]

This is a feature request, not a bug.

System information (version)

• OpenCV =>3.3.1
• Operating System / Platform => Windows
• Compiler => MSVC 1914

Detailed description

I'd like to use the max-flow/min-cut algorithm, which is used in GrabCut. It would be nice, if we could move gcgraph.hpp from the source directory to the header files. This would make the class GCGraph and its function maxflow() available outside GrabCut.

Steps to reproduce

(not applicable)

[alalek]

In general, public interfaces should be:

• reliable for changes (including optimizations)
• minimal
• not expose internal details

"As is" GCGraph doesn't satisfy these requirements.
Also it is template-based class, that make things slightly worse ("TWeight" can be restricted to double, float, int types).
So some extra design work is required here.

Also public functionality requires tests.

[romanc]

I see. This make a lot of sense to me. Let me propose something different then. How about adding a new function

cv::maxFlow(InputArray img, InputOutputArray mask, Point source, Point sink)

which would create a GCGraph , run maxFlow() on it and write the output again to the given mask?