drawFPS            25 samples/cpp/tutorial_code/calib3d/real_time_pose_estimation/src/Utils.h void drawFPS(cv::Mat image, double fps, cv::Scalar color);
drawFPS           312 samples/cpp/tutorial_code/calib3d/real_time_pose_estimation/src/main_detection.cpp     drawFPS(frame_vis, fps, yellow); // frame ratio