private void rGBToolStripMenuItem_Click(object sender, EventArgs e)
{
if (tracker != null)
{
tracking = false;
tracker.Mode = CamshiftMode.RGB;
tracker.Reset();
marker = null;
}
rGBToolStripMenuItem.Checked = true;
hSLToolStripMenuItem.Checked = false;
mixedToolStripMenuItem.Checked = false;
}