Questions on restart the camera motion estimation

[tcpu]

I met the problem you mentioned in the file——readme.md just as followed：
If everything works, the stdout of the camera_tracker node should show [ WARN] [1355131430.132265592]: RGB image size has changed, resetting tracker! and the camera pose is published on the /rgbd/pose topic. You can restart the camera motion estimation by disabling and enabling the run_dense_tracking option.
So I want to know how to restart the camera motion estimation.Please into describe it with more details.Thanks a lot.