private void MenuHistogram_Click(object sender, EventArgs e)
{
FrmHistogram frmHistogram = new FrmHistogram(mCurrentImage);
frmHistogram.ShowDialog();
}
/// <summary>
/// 显示直方图
/// </summary>
private void BtnHistogram_Click(object sender, EventArgs e)
{
FrmHistogram frmHistogram = new FrmHistogram(mImgSource);
frmHistogram.ShowDialog();
}