private void medianFiltering_Click(object sender, EventArgs e)
        {
            MedianFilteringForm mff = new MedianFilteringForm(this);

            mff.ShowDialog();
        }
 private void medianFiltering_Click(object sender, EventArgs e)
 {
     MedianFilteringForm mff = new MedianFilteringForm(this);
     mff.ShowDialog();
 }