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If you just run with rosrun, you'll need to remap the topics. Check the wiki page for the actual names that the node subscribes/publishes: http://wiki.ros.org/depthimage_to_laserscan

If your topic is /camera/depth/image_raw, then you'd want to run:

  rosrun depthimage_to_laserscan depthimage_to_laserscan image:=camera/depth/image_raw

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