Display image in second thread, OpenCV?

Question

I have a loop to take in images from a high speed framegrabbger at 250fps.

/** Loop processes 250 video frames per second **/
while(1){
  AcquireFrame();
  DoPr         


        

Answer 1

Since the frame grabbing doesn't need to use the UI, I'd set up a secondary thread to handle the frame grabbing, and have the original thread that handles the UI display the sample frames. If you tried to display the frame currently be grabbed, you'd have to lock the data (which is generally fairly slow). To avoid that, I'd display a frame one (or possibly two) "behind" the one currently being grabbed, so there's no contention between grabbing and displaying the data. You'll still have to ensure that incrementing the current frame number is thread-safe, but that's pretty simple -- use InterlockedIncrement in the capture thread.