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Nodes within openni_camera and openni_launch probably need to subscribe to those nodes to do the different processes it takes to produce a registered depth image. However, you could start reducing topics and see if it has any negative effects on the various images which openni_camera can produce.

If you really wanted to suppress openni_camera from publishing to certain topics, you could go through openni_camera/src/nodelets/driver.cpp, here, and start looking at line 172.

I am relatively new at this, so I am happy to leave it publishing to all these topics.