simple_example_nodelet.cpp

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//http://wiki.ros.org/cv_bridge/Tutorials/UsingCvBridgeToConvertBetweenROSImagesAndOpenCVImages
#include <ros/ros.h>
#include <sensor_msgs/image_encodings.h>
#include <nodelet/nodelet.h>
#include <image_transport/image_transport.h>
#include <cv_bridge/cv_bridge.h>

#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>


#include <dynamic_reconfigure/server.h>


namespace simple_example {

static const std::string OPENCV_WINDOW = "Image window";

class ImageConverter
{
  ros::NodeHandle nh_;
  image_transport::ImageTransport it_;
  image_transport::Subscriber image_sub_;
  image_transport::Publisher image_pub_;
  bool debug_view_;

public:
  ImageConverter()
    : it_(nh_)
  {
    // Subscrive to input video feed and publish output video feed
    image_sub_ = it_.subscribe("image", 1,
      &ImageConverter::imageCb, this);
    image_pub_ = it_.advertise("/image_converter/output_video/raw", 1);

    ros::NodeHandle pnh_("~");
    pnh_.param("debug_view", debug_view_, false);
    if( debug_view_) {
      cv::namedWindow(OPENCV_WINDOW);
    }
  }

  ~ImageConverter()
  {
    if( debug_view_) {
      cv::destroyWindow(OPENCV_WINDOW);
    }
  }

  void imageCb(const sensor_msgs::ImageConstPtr& msg)
  {
    cv_bridge::CvImagePtr cv_ptr;
    try
    {
      cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::BGR8);
    }
    catch (cv_bridge::Exception& e)
    {
      ROS_ERROR("cv_bridge exception: %s", e.what());
      return;
    }

    // Draw an example circle on the video stream
    if (cv_ptr->image.rows > 110 && cv_ptr->image.cols > 110)
      cv::circle(cv_ptr->image, cv::Point(cv_ptr->image.cols/2, cv_ptr->image.rows/2), 100, CV_RGB(255,0,0));

    if( debug_view_) {
      // Update GUI Window
      cv::imshow(OPENCV_WINDOW, cv_ptr->image);
      cv::waitKey(3);
    }

    // Output modified video stream
    image_pub_.publish(cv_ptr->toImageMsg());
  }
};


class SimpleExampleNodelet : public nodelet::Nodelet
{


public:
  virtual void onInit()
  {
      simple_example::ImageConverter ic;
      ros::spin();
  }
};

}

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