simple_compressed_example_nodelet.cpp

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

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


#include <dynamic_reconfigure/server.h>


namespace simple_compressed_example {

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

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

public:
  ImageConverter()
  {
      // Subscrive to input video feed and publish output video feed
    image_sub_ = nh_.subscribe("image/compressed", 1,
            &ImageConverter::imageCb,this);
    image_pub_ = nh_.advertise<sensor_msgs::CompressedImage>("/image_converter/output_video/compressed", 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::CompressedImageConstPtr& msg)
  {
    cv_bridge::CvImagePtr cv_ptr;
    try
    {
      /*
        Supporting CompressedImage in cv_bridge has been started from 1.11.9 (2015-11-29)
        note : hydro 1.10.18, indigo : 1.11.13 ...
        https://github.com/ros-perception/vision_opencv/pull/70
       */
#ifndef CV_BRIDGE_COMPRESSED_IMAGE_IS_NOT_SUPPORTED
      cv_ptr = cv_bridge::toCvCopy(msg, sensor_msgs::image_encodings::BGR8);
#else
      //cv_ptr = cv_bridge::toCvCopyImpl(matFromImage(msg), msg.header, sensor_msgs::image_encodings::BGR8, sensor_msgs::image_encodings::BGR8);
          //cv::Mat matFromImage(const sensor_msgs::CompressedImage& source)
          cv::Mat jpegData(1,msg->data.size(),CV_8UC1);
          jpegData.data     = const_cast<uchar*>(&msg->data[0]);
          cv::InputArray data(jpegData);
          cv::Mat image     = cv::imdecode(data,cv::IMREAD_COLOR);

        //cv_ptr = cv_bridge::toCvCopyImpl(bgrMat, msg->header, sensor_msgs::image_encodings::BGR8, sensor_msgs::image_encodings::BGR8);
        sensor_msgs::Image ros_image;
        ros_image.header = msg->header;
        ros_image.height = image.rows;
        ros_image.width = image.cols;
        ros_image.encoding = sensor_msgs::image_encodings::BGR8;
        ros_image.is_bigendian = false;
        ros_image.step = image.cols * image.elemSize();
        size_t size = ros_image.step * image.rows;
        ros_image.data.resize(size);

        if (image.isContinuous())
          {
            memcpy((char*)(&ros_image.data[0]), image.data, size);
          }
        else
          {
            // Copy by row by row
            uchar* ros_data_ptr = (uchar*)(&ros_image.data[0]);
            uchar* cv_data_ptr = image.data;
            for (int i = 0; i < image.rows; ++i)
              {
                memcpy(ros_data_ptr, cv_data_ptr, ros_image.step);
                ros_data_ptr += ros_image.step;
                cv_data_ptr += image.step;
              }
          }
        cv_ptr = cv_bridge::toCvCopy(ros_image, sensor_msgs::image_encodings::BGR8);
#endif
    }
    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
#ifndef CV_BRIDGE_COMPRESSED_IMAGE_IS_NOT_SUPPORTED
    image_pub_.publish(cv_ptr->toCompressedImageMsg());
#else
    image_pub_.publish(toCompressedImageMsg(cv_ptr));
#endif
  }
#ifdef CV_BRIDGE_COMPRESSED_IMAGE_IS_NOT_SUPPORTED
  sensor_msgs::CompressedImage toCompressedImageMsg(cv_bridge::CvImagePtr cv_ptr) const
  {
    sensor_msgs::CompressedImage ros_image;
    const std::string dst_format = std::string();
    ros_image.header = cv_ptr->header;
    cv::Mat image;
    if(cv_ptr->encoding != sensor_msgs::image_encodings::BGR8)
      {
        cv_bridge::CvImagePtr tempThis = boost::make_shared<cv_bridge::CvImage>(*cv_ptr);
        cv_bridge::CvImagePtr temp = cv_bridge::cvtColor(tempThis,sensor_msgs::image_encodings::BGR8);
        cv_ptr->image = temp->image;
      }
    else
      {
        image = cv_ptr->image;
      }
    std::vector<uchar> buf;
    if (dst_format.empty() || dst_format == "jpg")
      {
        ros_image.format = "jpg";
        cv::imencode(".jpg", image, buf);
      }

    if (dst_format == "png")
      {
        ros_image.format = "png";
        cv::imencode(".png", image, buf);
      }

    //TODO: check this formats (on rviz) and add more formats
    //from http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html#Mat imread(const string& filename, int flags)
    if (dst_format == "jp2")
      {
        ros_image.format = "jp2";
        cv::imencode(".jp2", image, buf);
      }

    if (dst_format == "bmp")
      {
        ros_image.format = "bmp";
        cv::imencode(".bmp", image, buf);
      }

    if (dst_format == "tif")
      {
        ros_image.format = "tif";
        cv::imencode(".tif", image, buf);
      }

    ros_image.data = buf;
    return ros_image;
  }
#endif
};


class SimpleCompressedExampleNodelet : public nodelet::Nodelet
{


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

}

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