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Normally, camera nodes publish their topics (image_raw, camera_info etc.) to a sub namespace (/camera/image_raw, /camera/camera_info etc.) as opposed directly to the root namespace. Note also that the example launch file uses nodelets, and loads the qr detection nodelets into already pre-existing camera nodelet managers. It would help if you can edit your original question and post the output of the following commands:

rostopic info /image_raw

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 rostopic list | grep image