I am kind new with emgucv and optical flow. I am trying to recognize object in motion on video and draw around them circle or rectangle or some other shape. I must use opticalflow.HS and opticalflow.LK. That is the first thing I want to do. I am using emgu cv 2.4.9.I have some code, but it is just some thinking. I red previous frame and current frame and sent it to opticalflow.HS but I don't know what to do after that and I can't find any example using HS, so I would really appreciate same example what to do next after opticalflow.HS and also some advice.
private void ProcessFrame(object sender, EventArgs e)
{
bool firstFrame = true;
bool keepProcessing = true;
Image<Gray, Byte> nextFrame = new Image<Gray, byte>(160, 640);
Image<Gray, Byte> previousFrame = null;
while (keepProcessing)
{
// ****** Change - Save previous frame before getting next one
// Only do this if the first frame has passed
if (!firstFrame)
previousFrame = nextFrame.Clone();
// grab the next frame from video source
// _capture.Grab();
// decode and return the grabbed video frame
nextFrame = _capture.RetrieveGrayFrame();
// if the frame is valid (not end of video for example)
if (!(nextFrame==null))
{
// **** Change - If we are on the first frame, only show that and
// set the flag to false
if (firstFrame)
{
firstFrame = false;
}
else
{
Image<Gray, float> velx = new Image<Gray, float>(previousFrame.Size);
Image<Gray, float> vely = new Image<Gray, float>(nextFrame.Size);
OpticalFlow.HS(previousFrame, nextFrame, true, velx, vely, 0.1d, new MCvTermCriteria(100));
//capturedImageBox.Image = nextFrame;
}
}
else
{
keepProcessing = false;
}
}
