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I fixed it with the help of my friends. in /home/michael/catkin_ws/src/procrob_functional/src --face_recognition.cpp

change image_sub_ = it_.subscribe("/camera/image_raw", 1, &FaceRecognition::imageCB, this); to image_sub_ = it_.subscribe("/usb_cam/image_raw", 1, &FaceRecognition::imageCB, this);
that is because I use "usb_cam" node not "camera" node

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