edge_detection_nodelet.cpp

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// https://github.com/Itseez/opencv/blob/2.4/samples/cpp/tutorial_code/ImgTrans/
#include <ros/ros.h>
#include "opencv_apps/nodelet.h"
#include <image_transport/image_transport.h>
#include <sensor_msgs/image_encodings.h>
#include <cv_bridge/cv_bridge.h>

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

#include <dynamic_reconfigure/server.h>
#include "opencv_apps/EdgeDetectionConfig.h"

namespace opencv_apps
{
class EdgeDetectionNodelet : public opencv_apps::Nodelet
{
  image_transport::Publisher img_pub_;
  image_transport::Subscriber img_sub_;
  image_transport::CameraSubscriber cam_sub_;
  ros::Publisher msg_pub_;

  boost::shared_ptr<image_transport::ImageTransport> it_;

  typedef opencv_apps::EdgeDetectionConfig Config;
  typedef dynamic_reconfigure::Server<Config> ReconfigureServer;
  Config config_;
  boost::shared_ptr<ReconfigureServer> reconfigure_server_;

  int queue_size_;
  bool debug_view_;
  ros::Time prev_stamp_;

  int canny_threshold1_;
  int canny_threshold2_;
  int apertureSize_;
  bool L2gradient_;
  bool apply_blur_pre_;
  bool apply_blur_post_;
  int postBlurSize_;
  double postBlurSigma_;

  std::string window_name_;
  static bool need_config_update_;

  void reconfigureCallback(Config& new_config, uint32_t level)
  {
    config_ = new_config;
    canny_threshold1_ = config_.canny_threshold1;
    canny_threshold2_ = config_.canny_threshold2;
    apertureSize_ = 2 * ((config_.apertureSize / 2)) + 1;
    L2gradient_ = config_.L2gradient;

    apply_blur_pre_ = config_.apply_blur_pre;
    apply_blur_post_ = config_.apply_blur_post;
    postBlurSize_ = 2 * ((config_.postBlurSize) / 2) + 1;
    postBlurSigma_ = config_.postBlurSigma;
  }

  const std::string& frameWithDefault(const std::string& frame, const std::string& image_frame)
  {
    if (frame.empty())
      return image_frame;
    return frame;
  }

  void imageCallbackWithInfo(const sensor_msgs::ImageConstPtr& msg, const sensor_msgs::CameraInfoConstPtr& cam_info)
  {
    doWork(msg, cam_info->header.frame_id);
  }

  void imageCallback(const sensor_msgs::ImageConstPtr& msg)
  {
    doWork(msg, msg->header.frame_id);
  }

  static void trackbarCallback(int /*unused*/, void* /*unused*/)
  {
    need_config_update_ = true;
  }

  void doWork(const sensor_msgs::ImageConstPtr& msg, const std::string& input_frame_from_msg)
  {
    // Work on the image.
    try
    {
      // Convert the image into something opencv can handle.
      cv::Mat frame = cv_bridge::toCvShare(msg, sensor_msgs::image_encodings::BGR8)->image;

      // Do the work
      cv::Mat src_gray;
      cv::GaussianBlur(frame, frame, cv::Size(3, 3), 0, 0, cv::BORDER_DEFAULT);

      if (frame.channels() > 1)
      {
        cv::cvtColor(frame, src_gray, cv::COLOR_RGB2GRAY);
      }
      else
      {
        src_gray = frame;
      }

      if (debug_view_)
      {
        cv::namedWindow(window_name_, cv::WINDOW_AUTOSIZE);
      }

      std::string new_window_name;
      cv::Mat grad;
      switch (config_.edge_type)
      {
        case opencv_apps::EdgeDetection_Sobel:
        {
          cv::Mat grad_x, grad_y;
          cv::Mat abs_grad_x, abs_grad_y;

          int scale = 1;
          int delta = 0;
          int ddepth = CV_16S;

          // Scharr( src_gray, grad_x, ddepth, 1, 0, scale, delta, BORDER_DEFAULT );
          cv::Sobel(src_gray, grad_x, ddepth, 1, 0, 3, scale, delta, cv::BORDER_DEFAULT);
          cv::convertScaleAbs(grad_x, abs_grad_x);

          // Scharr( src_gray, grad_y, ddepth, 0, 1, scale, delta, BORDER_DEFAULT );
          cv::Sobel(src_gray, grad_y, ddepth, 0, 1, 3, scale, delta, cv::BORDER_DEFAULT);
          cv::convertScaleAbs(grad_y, abs_grad_y);

          cv::addWeighted(abs_grad_x, 0.5, abs_grad_y, 0.5, 0, grad);

          new_window_name = "Sobel Edge Detection Demo";
          break;
        }
        case opencv_apps::EdgeDetection_Laplace:
        {
          cv::Mat dst;
          int kernel_size = 3;
          int scale = 1;
          int delta = 0;
          int ddepth = CV_16S;

          cv::Laplacian(src_gray, dst, ddepth, kernel_size, scale, delta, cv::BORDER_DEFAULT);
          convertScaleAbs(dst, grad);

          new_window_name = "Laplace Edge Detection Demo";
          break;
        }
        case opencv_apps::EdgeDetection_Canny:
        {
          int edge_thresh = 1;
          int kernel_size = 3;
          int const max_canny_threshold1 = 500;
          int const max_canny_threshold2 = 500;
          cv::Mat detected_edges;

          if (apply_blur_pre_)
          {
            cv::blur(src_gray, src_gray, cv::Size(apertureSize_, apertureSize_));
          }

          cv::Canny(src_gray, grad, canny_threshold1_, canny_threshold2_, kernel_size, L2gradient_);
          if (apply_blur_post_)
          {
            cv::GaussianBlur(grad, grad, cv::Size(postBlurSize_, postBlurSize_), postBlurSigma_,
                             postBlurSigma_);  // 0.3*(ksize/2 - 1) + 0.8
          }

          new_window_name = "Canny Edge Detection Demo";

          if (debug_view_)
          {
            if (need_config_update_)
            {
              config_.canny_threshold1 = canny_threshold1_;
              config_.canny_threshold2 = canny_threshold2_;
              reconfigure_server_->updateConfig(config_);
              need_config_update_ = false;
            }
            if (window_name_ == new_window_name)
            {
              cv::createTrackbar("Min CannyThreshold1:", window_name_, &canny_threshold1_, max_canny_threshold1,
                                 trackbarCallback);
              cv::createTrackbar("Min CannyThreshold2:", window_name_, &canny_threshold2_, max_canny_threshold2,
                                 trackbarCallback);
            }
          }
          break;
        }
      }

      if (debug_view_)
      {
        if (window_name_ != new_window_name)
        {
          cv::destroyWindow(window_name_);
          window_name_ = new_window_name;
        }
        cv::imshow(window_name_, grad);
        int c = cv::waitKey(1);
      }

      // Publish the image.
      sensor_msgs::Image::Ptr out_img =
          cv_bridge::CvImage(msg->header, sensor_msgs::image_encodings::MONO8, grad).toImageMsg();
      img_pub_.publish(out_img);
    }
    catch (cv::Exception& e)
    {
      NODELET_ERROR("Image processing error: %s %s %s %i", e.err.c_str(), e.func.c_str(), e.file.c_str(), e.line);
    }

    prev_stamp_ = msg->header.stamp;
  }

  void subscribe()  // NOLINT(modernize-use-override)
  {
    NODELET_DEBUG("Subscribing to image topic.");
    if (config_.use_camera_info)
      cam_sub_ = it_->subscribeCamera("image", queue_size_, &EdgeDetectionNodelet::imageCallbackWithInfo, this);
    else
      img_sub_ = it_->subscribe("image", queue_size_, &EdgeDetectionNodelet::imageCallback, this);
  }

  void unsubscribe()  // NOLINT(modernize-use-override)
  {
    NODELET_DEBUG("Unsubscribing from image topic.");
    img_sub_.shutdown();
    cam_sub_.shutdown();
  }

public:
  virtual void onInit()  // NOLINT(modernize-use-override)
  {
    Nodelet::onInit();
    it_ = boost::shared_ptr<image_transport::ImageTransport>(new image_transport::ImageTransport(*nh_));

    pnh_->param("queue_size", queue_size_, 3);
    pnh_->param("debug_view", debug_view_, false);

    if (debug_view_)
    {
      always_subscribe_ = true;
    }
    prev_stamp_ = ros::Time(0, 0);

    window_name_ = "Edge Detection Demo";
    canny_threshold1_ = 100;  // only for canny
    canny_threshold2_ = 200;  // only for canny

    reconfigure_server_ = boost::make_shared<dynamic_reconfigure::Server<Config> >(*pnh_);
    dynamic_reconfigure::Server<Config>::CallbackType f =
        boost::bind(&EdgeDetectionNodelet::reconfigureCallback, this, _1, _2);
    reconfigure_server_->setCallback(f);

    img_pub_ = advertiseImage(*pnh_, "image", 1);
    // msg_pub_ = local_nh_.advertise<opencv_apps::LineArrayStamped>("lines", 1, msg_connect_cb, msg_disconnect_cb);

    onInitPostProcess();
  }
};
bool EdgeDetectionNodelet::need_config_update_ = false;
}  // namespace opencv_apps

namespace edge_detection
{
class EdgeDetectionNodelet : public opencv_apps::EdgeDetectionNodelet
{
public:
  virtual void onInit()  // NOLINT(modernize-use-override)
  {
    ROS_WARN("DeprecationWarning: Nodelet edge_detection/edge_detection is deprecated, "
             "and renamed to opencv_apps/edge_detection.");
    opencv_apps::EdgeDetectionNodelet::onInit();
  }
};
}  // namespace edge_detection

#include <pluginlib/class_list_macros.h>
PLUGINLIB_EXPORT_CLASS(opencv_apps::EdgeDetectionNodelet, nodelet::Nodelet);
PLUGINLIB_EXPORT_CLASS(edge_detection::EdgeDetectionNodelet, nodelet::Nodelet);