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What does this constructor does?

Suppose you feed it rectangles in a loop like done here, will it create Matrix that will span all the rectangles?

Thanks

What does this constructor does?

Suppose you feed it rectangles in a loop like done here, will it create Matrix that will span all the rectangles?

If I am right, and that loop and constructor are sort of concatenating the different rectangles into one matrix called mask, then how can I do the same in a better way? Surely there must be a function for that in OpenCV.

Thanks