private void binarizationToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (_image.OriginalImage != null)
            {
                var form = new ThresholdInputBox(_image.OriginalImage);
                form.ThresholdChanged += (o, threshold) =>
                {
                    form.PictureBox1.Image = _processor.Binarization(_image.OriginalImage, threshold);
                };
                if (form.ShowDialog() == DialogResult.OK)
                {
                    _image.ViewImage = form.PictureBox1.Image as Bitmap;
                    isBinarized      = true;
                }

                form.Dispose();
            }
        }