blob_detector.cpp

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// -*- mode: c++ -*-
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#include "jsk_perception/blob_detector.h"
#include <opencv2/opencv.hpp>
#include <cv_bridge/cv_bridge.h>
#include <sensor_msgs/image_encodings.h>
#include <jsk_perception/Labeling.h>

namespace jsk_perception
{
  void BlobDetector::onInit()
  {
    DiagnosticNodelet::onInit();
    srv_ = boost::make_shared <dynamic_reconfigure::Server<Config> > (*pnh_);
    dynamic_reconfigure::Server<Config>::CallbackType f =
      boost::bind (
        &BlobDetector::configCallback, this, _1, _2);
    srv_->setCallback (f);

    pub_ = advertise<sensor_msgs::Image>(
      *pnh_, "output", 1);
  }

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

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

  void BlobDetector::detect(
    const sensor_msgs::Image::ConstPtr& image_msg)
  {
    vital_checker_->poke();
    boost::mutex::scoped_lock lock(mutex_);
    cv::Mat image = cv_bridge::toCvShare(image_msg, image_msg->encoding)->image;
    cv::Mat label(image.size(), CV_16SC1);
    LabelingBS labeling;
    labeling.Exec(image.data, (short*)label.data, image.cols, image.rows,
                  true, min_area_);
    
    cv::Mat label_int(image.size(), CV_32SC1);
    for (int j = 0; j < label.rows; j++) {
      for (int i = 0; i < label.cols; i++) {
        label_int.at<int>(j, i) = label.at<short>(j, i);
      }
    }
    pub_.publish(
      cv_bridge::CvImage(image_msg->header,
                         sensor_msgs::image_encodings::TYPE_32SC1,
                         label_int).toImageMsg());
  }

  void BlobDetector::configCallback(Config &config, uint32_t level)
  {
    boost::mutex::scoped_lock lock(mutex_);
    min_area_ = config.min_area;
  }
  
}

#include <pluginlib/class_list_macros.h>
PLUGINLIB_EXPORT_CLASS (jsk_perception::BlobDetector, nodelet::Nodelet);