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Hello, I was indeed having your same problem and it was because of the launch file I was using, which was this one. I still don't know why it didn't work, but adding the oppeni_launch include to the example launch file that Miguel Massot linked above fixed my problem, I don't think it should be any different in your case because you use Indigo. My current, working, launch file is this one:

<launch>
   <include file="$(find openni_launch)/launch/openni.launch">
  </include>


  <arg name="camera" default="camera" />
  <node pkg="nodelet" type="nodelet" args="manager" name="nodelet_manager" />
  <node pkg="nodelet" type="nodelet" name="convert_openni_fovis" 
        args="load depth_image_proc/convert_metric nodelet_manager">
    <remap from="image_raw" to="$(arg camera)/depth_registered/sw_registered/image_rect_raw"/>
    <remap from="image" to="$(arg camera)/depth_registered/image_rect"/>
  </node>

  <node pkg="fovis_ros" type="fovis_mono_depth_odometer" name="kinect_odometer" >
    <remap from="/camera/rgb/image_rect" to="$(arg camera)/rgb/image_rect_mono" />
    <remap from="/camera/rgb/camera_info" to="$(arg camera)/rgb/camera_info" />
    <remap from="/camera/depth_registered/camera_info" to="$(arg camera)/depth_registered/sw_registered/camera_info" />
    <remap from="/camera/depth_registered/image_rect" to="$(arg camera)/depth_registered/image_rect" />
    <param name="approximate_sync" type="bool" value="True" />
    <param name="publish_tf" type="bool" value="False" />
  </node>

</launch>

Hope it helps.