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Launch your nodelet then launch rqt and and add a Configuration | Dynamic Reconfigure plugin. Then click on psx and you will see the parameters you can change (radius_search and min_neighbors). You can tune them live to find good values, then replace the params in your launch file with these parameters and values (mean_k and stddev look like they are valid for StatisticalOutlierRemoval but not RadiusOutlierRemoval, so get rid of them).

Launch your nodelet then launch rqt and and add a Configuration | Dynamic Reconfigure plugin. Then click on psx and you will see the parameters you can change (radius_search and min_neighbors). You can tune them live to find good values, then replace the params in your launch file with these parameters and values (mean_k and stddev look like they are valid for StatisticalOutlierRemoval but not RadiusOutlierRemoval, so get rid of them).

 <node pkg="nodelet" type="nodelet" name="psx" args="load pcl/RadiusOutlierRemoval box_filter_pcl_manager" output="screen">
  <rosparam>
      radius_search: 0.2
      min_neighbors: 4
  </rosparam>
</node>