Launch file parameters

[jian-li]

In the kinect launch file, the camera_rgb_optical_frame to camera_link frame transform is set to 0.045, but I find the https://github.com/rarrais/aruco_hand_eye parameter is 0.022, is this parameter right? I checked the openni_launch and openni2_launch file, the parameter is 0.045 for default. And I am a little confused about the camera frame of openni_launch file, the image should be publishe with the frame id set to camera_link, why camera_rgb_optical_frame is needed?