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I usually use opencv waitKey (Which requires imshow to have run, could be blank mat, and then the keys pressed with the imshow window in focus can be caught or it can time out after so many milliseconds.

I usually use opencv waitKey (Which requires imshow to have run, could be blank mat, and then the keys pressed with the imshow window in focus can be caught or it can time out after so many milliseconds.

http://docs.opencv.org/modules/highgui/doc/user_interface.html#waitkey

I usually use opencv waitKey (Which requires imshow to have run, run), could be blank mat, cv::Mat that is displayed, and then the keys pressed with the imshow window in focus can be caught or it can time out after so many milliseconds.

http://docs.opencv.org/modules/highgui/doc/user_interface.html#waitkey