Hello, I have some issue with this package. I change in a launch file

<remap from="image" to="camera/rgb/image_raw" />  

to

<remap from="image" to="/image_raw" /> 

where /image_raw my camera topic. But nodes only starts and in rostopic list i don't see any topics, and of course nothing publishing. Where is a problem? Please help, or you can to advise to me another qr code detection package?