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[..] install zbar_ros on Ubantu 14.04
Assuming you are running Indigo, this should be a simple matter of:
sudo apt-get install ros-indigo-zbar-ros
as that package has been released for both Hydro and Indigo. There is no need to build it from source.
As to its usage: the barcode_reader_node node subscribes to a sensor_msgs/Image topic. Anything that can produce such messages would be suitable as input.
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[..] install zbar_ros on Ubantu 14.04
Assuming you are running Indigo, this should be a simple matter of:
sudo apt-get install ros-indigo-zbar-ros
as that package has been released for both Hydro and Indigo. Indigo (has the released badge on the wiki page you linked, and according to debbuild/indigo - zbar). There is no need to build it from source.
As to its usage: the barcode_reader_node node subscribes to a sensor_msgs/Image topic. Anything that can produce such messages would be suitable as input.
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