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There is some redundancy in your launch file. How about that?

<launch>
 <group ns="camera">
  <node name="left" pkg="usb_cam" type="usb_cam_node" output="screen" >
    <param name="video_device" value="/dev/video1" />
    <param name="image_width" value="640" />
    <param name="image_height" value="480" />
    <param name="pixel_format" value="yuyv" />
    <param name="camera_frame_id" value="yuyv" />
    <param name="io_method" value="mmap"/>
  </node>
  <node name="image_view_left" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/camera/left/image_raw"/>
    <param name="autosize" value="true" />
  </node>
  <node name="right" pkg="usb_cam" type="usb_cam_node" output="screen" >
    <param name="video_device" value="/dev/video2" />
    <param name="image_width" value="640" />
    <param name="image_height" value="480" />
    <param name="pixel_format" value="yuyv" />
    <param name="camera_frame_id" value="yuyv" />
    <param name="io_method" value="mmap"/>
  </node>
  <node name="image_view_right" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/camera/right/image_raw"/>
    <param name="autosize" value="true" />
  </node>  
 </group>
</launch>