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you can use nodelet to load two edge detector into one process.

<launch>
  <node pkg="nodelet" type="nodelet" name="manager" args="manager"/>

  <node pkg="nodelet" type="nodelet" name="left_edge_detector"
        args="load edge_detection/edge_detection manager">
    <remap from="image" to="left/image_raw" />
    <param name="debug_view" value="false" />
  </node>
  <node pkg="nodelet" type="nodelet" name="right_edge_detector"
        args="load edge_detection/edge_detection manager">
    <remap from="image" to="right/image_raw" />
    <param name="debug_view" value="false" />
  </node> 

  <node pkg="image_view" type="image_view" name="left_edge_viewer">
    <remap from="image" to="left_edge_detector/image" />
  </node>
  <node pkg="image_view" type="image_view" name="right_edge_viewer">
    <remap from="image" to="right_edge_detector/image" />
  </node>
</launch>