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The ~ character in the documentation on the wiki isn't part of the param name. It just indicates that the parameter is private. In roslaunch, you specify a private parameter by putting the <param> tag inside of the <node>

The ~ character in the documentation on the wiki isn't part of the param parameter name. It just indicates that the parameter is private. In roslaunch, you specify a private parameter by putting the <param> tag inside of the <node> tag.

<launch>
     .
     .
     .
  <node name="image_proc" pkg="image_proc" type="image_proc" ns="camera_pi"  output="screen" >
     <param name="queue_size" value="1" />
  </node>
</launch>

The ~ character in the parameter in the documentation on the wiki isn't part of the parameter name. It just indicates that the parameter is private. In roslaunch, you specify a private parameter by putting the <param> tag inside of the <node> tag.

Your launch should look like this:

<launch>
     .
     .
     .
  <node name="image_proc" pkg="image_proc" type="image_proc" ns="camera_pi"  output="screen" >
     <param name="queue_size" value="1" />
  </node>
</launch>

For more information on parameter namespaces, see the wiki page on Names.