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the node tag in roslaunch xml format allows a ns, i.e. namespace, attribute:

wiki.ros.org/roslaunch/XML/node#Attributes

i think

ROS_NAMESPACE=usb_cam rosrun image_proc image_proc

would be something like

  <node name="image_proc" pkg="image_proc" type="image_proc" ns="usb_cam"/>

in a launch file.