Launch two camera nodes for stereo calibration

edit

Hello, I am attempting to launch two camera nodes via a launch file in order to calibrate them via stereo. Below is my launch file:

<launch> 

  <node name="leftCam" 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="usb_cam" />
    <param name="io_method" value="mmap"/>
  </node>

  <node name="left_image_view0" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/leftCam/image_raw"/>
    <param name="autosize" value="true" />
  </node>

  <node name="rightCam" 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="usb_cam" />
    <param name="io_method" value="mmap"/>
  </node>

  <node name="right_image_view0" pkg="image_view" type="image_view" respawn="false" output="screen">
    <remap from="image" to="/rightCam/image_raw"/>
    <param name="autosize" value="true" />
  </node>

</launch>

I am pretty new to ROS and need some help getting this to output two separate image to my monitor, each from separate cameras.

Right now I run roscore in one terminal followed by roslaunch (launch_file_name).launch in another terminal. I get two little grey boxes on my screen but no camera output. I have verified that the cameras are connected as they can be accessed via other software.

Any help would be appreciated.

Thanks.