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Once you have a large set of rectangles, you can use the groupRectangles() functionality which combines overlapping rectangles into a single positive detection.

Take a look here.

Once you have a large set of rectangles, you can use the groupRectangles() functionality which combines overlapping rectangles into a single positive detection.

Take a look here.

However, to use this, you will either have to

Transform your project to the C++ interface
Transform your data locally to a C++ data structure, to apply the function

The C-API doesn't provide this interface, nor will it provide newer functionality....