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What is good to know about zbar_ros is that it only subscribes to the image topic when you start listening on its output topic (relevant function in zbar_ros source). As soon as you run rostopic echo /barcode, you will see a notification that zbar_ros subscribes to the image topic.

As a sidenote: in my setup I did the remap on the zbar_ros side, instead of the camera side. Not sure if that is relevant.