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these lines are the key

        Mat dilatedMask = new Mat();
        Imgproc.dilate(mask, dilatedMask, new Mat());
        Imgproc.dilate(dilatedMask, dilatedMask, new Mat());

you could try changing like

        Mat dilatedMask = new Mat();
        Imgproc.erode(mask, dilatedMask, new Mat());
        Imgproc.erode(dilatedMask, dilatedMask, new Mat());

or to draw exact contour of blob

        Mat dilatedMask = mask.clone();