/// <summary>
/// Update the motion history with the specific image and the specific timestamp
/// </summary>
/// <param name="foregroundMask">The foreground of the image to be added to history</param>
/// <param name="timestamp">The time when the image is captured</param>
public void Update(Mat foregroundMask, DateTime timestamp)
{
_lastTime = timestamp;
TimeSpan ts = _lastTime.Subtract(_initTime);
if (_mhi == null)
{
_mhi = new Mat(foregroundMask.Rows, foregroundMask.Cols, DepthType.Cv32F, 1);
}
CvInvoke.UpdateMotionHistory(foregroundMask, _mhi, ts.TotalSeconds, _mhiDuration);
double scale = 255.0 / _mhiDuration;
_mhi.ConvertTo(_mask, DepthType.Cv8U, scale, (_mhiDuration - ts.TotalSeconds) * scale);
CvInvoke.CalcMotionGradient(_mhi, _mask, _orientation, _maxTimeDelta, _minTimeDelta);
}
