octree_change_publisher_nodelet.cpp

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 * Software License Agreement (BSD License)
 *
 *  Copyright (c) 2013, Yuto Inagaki and JSK Lab
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#include "jsk_pcl_ros/octree_change_publisher.h"
#include <pluginlib/class_list_macros.h>

namespace jsk_pcl_ros
{
  void OctreeChangePublisher::onInit(void)
  {
    ConnectionBasedNodelet::onInit();
    counter_ = 0;

    pnh_->param("resolution", resolution_, 0.02);
    pnh_->param("noise_filter", noise_filter_, 2);

    octree_ = new pcl::octree::OctreePointCloudChangeDetector<pcl::PointXYZRGB>(resolution_);

    filtered_cloud.reset(new pcl::PointCloud<pcl::PointXYZRGB>);

    diff_pub_ = advertise<sensor_msgs::PointCloud2>(*pnh_, "octree_change_result", 1);
  }

  void OctreeChangePublisher::subscribe()
  {
    sub_ = pnh_->subscribe("input", 1, &OctreeChangePublisher::cloud_cb,this);
  }

  void OctreeChangePublisher::unsubscribe()
  {
    sub_.shutdown();
  }

  void OctreeChangePublisher::cloud_cb(const sensor_msgs::PointCloud2 &pc)
  {
    if(pc.fields.size() <= 0){
      return;
    }

    pcl::PointCloud<pcl::PointXYZRGB>::Ptr cloud(new pcl::PointCloud<pcl::PointXYZRGB>());
    std::vector<int> indices;
    pcl::fromROSMsg(pc, *cloud);
    octree_->setInputCloud (cloud);
    octree_->addPointsFromInputCloud ();

    if (counter_ != 0){
      boost::shared_ptr<std::vector<int> > newPointIdxVector (new std::vector<int>);

      octree_->getPointIndicesFromNewVoxels (*newPointIdxVector, noise_filter_);

      filtered_cloud.reset (new pcl::PointCloud<pcl::PointXYZRGB>);
      filtered_cloud->points.reserve(newPointIdxVector->size());

      for (std::vector<int>::iterator it = newPointIdxVector->begin (); it != newPointIdxVector->end (); it++)
        filtered_cloud->points.push_back(cloud->points[*it]);

      sensor_msgs::PointCloud2 octree_change_pointcloud2;
      pcl::toROSMsg(*filtered_cloud, octree_change_pointcloud2);
      octree_change_pointcloud2.header = pc.header;
      octree_change_pointcloud2.is_dense = false;
      diff_pub_.publish(octree_change_pointcloud2);
    }

    octree_->switchBuffers ();
    counter_++;
  }
}

PLUGINLIB_EXPORT_CLASS (jsk_pcl_ros::OctreeChangePublisher, nodelet::Nodelet);