OpenCV小屏幕显示延迟？

Question

I am using OpenCV to write an app (in C++ on Windows 7) that uses the cv.camshift() function to track an object on the screen. I noticed that the my camera window (my application window showing what the camera sees) has a little delay with respect to very rapid motions. The delay seems to be about 0.1 seconds - very small, but noticable. I am developing an application that is very sensitive to these delays. In order to rule out my coding error, I tried to use one of the OpenCV sample video apps that shows what the camera sees on the screen and it also had this tiny delay. Interestingly, when I look at what my camera sees through Skype, there seems to be virtually no delay at all. Is there anything I can do to make OpenCV operate faster to get rid of this tiny delay?

Answer 1

CamShift detects motion using meanShift - the mean motion of the object center. This has to be calculated over more than one frame. For a frame rate of 30 Hz, a depth of 3 frames would be 0.1 seconds.