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 opencv_apps
{
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_;
  int queue_size_;
  bool debug_view_;
 
public:
  ImageConverter()
  {
    // Subscrive to input video feed and publish output video feed
    image_sub_ = nh_.subscribe("image/compressed", queue_size_, &ImageConverter::imageCb, this);
    image_pub_ = nh_.advertise<sensor_msgs::CompressedImage>("/image_converter/output_video/compressed", 1);
 
    ros::NodeHandle pnh("~");
    pnh.param("queue_size", queue_size_, 3);
    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
};
 
}  // namespace simple_compressed_example
 
class SimpleCompressedExampleNodelet : public nodelet::Nodelet
{
public:
  virtual void onInit()  // NOLINT(modernize-use-override)
  {
    simple_compressed_example::ImageConverter ic;
    ros::spin();
  }
};
 
}  // namespace opencv_apps
 
namespace simple_compressed_example
{
class SimpleCompressedExampleNodelet : public opencv_apps::SimpleCompressedExampleNodelet
{
public:
  virtual void onInit()  // NOLINT(modernize-use-override)
  {
    ROS_WARN("DeprecationWarning: Nodelet simple_compressed_example/simple_compressed_example is deprecated, "
             "and renamed to opencv_apps/simple_compressed_example.");
    opencv_apps::SimpleCompressedExampleNodelet::onInit();
  }
};
}  // namespace simple_compressed_example
 
#ifdef USE_PLUGINLIB_CLASS_LIST_MACROS_H
#include <pluginlib/class_list_macros.h>
#else
#include <pluginlib/class_list_macros.hpp>
#endif
PLUGINLIB_EXPORT_CLASS(opencv_apps::SimpleCompressedExampleNodelet, nodelet::Nodelet);
PLUGINLIB_EXPORT_CLASS(simple_compressed_example::SimpleCompressedExampleNodelet, nodelet::Nodelet);