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pass arg to ros node in launch file

How do i properly pass argument to ros node in ros launch file? Here is the ros node which i want to launch from a roslaunch file:

> <launch>   <node name="2d_obj_rec"
> pkg="advanced_vision_pkg"
> type="2d_obj_rec" args="image"
>     output="screen"/> </launch>

Here i want to pass image arugment like " rosrun advanced_vision_pkg 2d_obj_rec image:=/camera/image"
when i launch the file using cmd " roslaunch advanced_vision_pkg 2d_obj_rec.launch image:=/camera/image" it is not working.