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I got it working fine when I did it with C++, it was like:

 Mat floodFilled = cv::Mat::zeros(src.rows + 2, src.cols + 2, CV_8U);

floodFill(src, floodFilled, cv::Point(0, 0), 0, 0, cv::Scalar(), cv::Scalar(), 4 + (255 << 8) + cv::FLOODFILL_MASK_ONLY);
floodFilled = cv::Scalar::all(255) - floodFilled;

Mat temp;
floodFilled(Rect(1, 1, src.cols - 2, src.rows - 2)).copyTo(temp);
floodFilled = temp;
imshow("5. Floodfill", floodFilled);

But I can't reproduce this in java because some features does not exist there, like these lines:

floodFilled = cv::Scalar::all(255) - floodFilled;

I can't subtract a matrix from a scalar this way.

floodFilled(Rect(1, 1, src.cols - 2, src.rows - 2)).copyTo(temp);

this constructor does not exist either.

The output image was exactly the same as the input one.

So, I want to be able to do the same thing that I did in C++, with java instead. Thanks in advance.