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  1. If you use OpenCV or newer you can enable built-in fps-meter in application layout. See tutorial-1 for more detailes.
  2. If you want to get precise processing time you can use cv::getTickCount function in C++ and Core.getTickCount() in Java.
  3. In most cases the best solution is to measure processing time only. Camera performance may differ from frame to frame and depends on a lot of parameters, i.e. lightning.