private ContourMapGenerator(PictureBox pictureBox)
        {
            _pictureBox            = pictureBox;
            _insidePoint           = new Marker();
            _insidePoint.Parent    = _pictureBox;
            _insidePoint.BackColor = Color.Yellow;
            _insidePoint.Size      = new Size(4, 4);
            _insidePoint.Hide();

            _maskGenerator = MaskGenerator.GetInstance();
        }