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Have you try the cv::findContours method directly on the getLabelContourMask() from SEEDS? You can also increase the size of the boundaries to help the detection.

If it does not work, I think the only solution is to do it by hand: iterate through the getLabelContourMask (on vertical, the on horizontal) and add the positive pixel to a line. You have to first find the beginning on the line (let say scanning horizontal pixel until you find a positive one, and then iterate through a vertical neighborhood. Quite old school, but I don't see any other solution...