/// <summary>
/// Given a rectangle area of the motion, output the angle of the motion and the number of pixels that are considered to be motion pixel
/// </summary>
/// <param name="motionRectangle">The rectangle area of the motion</param>
/// <param name="angle">The orientation of the motion</param>
/// <param name="motionPixelCount">Number of motion pixels within silhouette ROI</param>
/// <param name="forgroundMask">The foreground mask used to calculate the motion info.</param>
public void MotionInfo(Mat forgroundMask, System.Drawing.Rectangle motionRectangle, out double angle, out double motionPixelCount)
{
TimeSpan ts = _lastTime.Subtract(_initTime);
// select component ROI
using (Mat forgroundMaskRect = new Mat(forgroundMask, motionRectangle))
using (Mat mhiRect = new Mat(_mhi, motionRectangle))
using (Mat orientationRect = new Mat(_orientation, motionRectangle))
using (Mat maskRect = new Mat(_mask, motionRectangle))
{
// calculate orientation
angle = CvInvoke.CalcGlobalOrientation(orientationRect, maskRect, mhiRect, ts.TotalSeconds, _mhiDuration);
angle = 360.0 - angle; // adjust for images with top-left origin
// calculate number of points within silhouette ROI
motionPixelCount = CvInvoke.Norm(forgroundMaskRect, null, CvEnum.NormType.L1);
}
}