hough_lines_nodelet.cpp

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// https://github.com/Itseez/opencv/blob/2.4/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp
#include <ros/ros.h>
#include "opencv_apps/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>
#include "opencv_apps/HoughLinesConfig.h"
#include "opencv_apps/Line.h"
#include "opencv_apps/LineArray.h"
#include "opencv_apps/LineArrayStamped.h"

namespace opencv_apps
{
class HoughLinesNodelet : 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::HoughLinesConfig 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_;

  std::string window_name_;
  static bool need_config_update_;

  int min_threshold_;
  int max_threshold_;
  int threshold_;
  double rho_;
  double theta_;
  double minLineLength_;
  double maxLineGap_;

  void reconfigureCallback(Config& new_config, uint32_t level)
  {
    config_ = new_config;
    rho_ = config_.rho;
    theta_ = config_.theta;
    threshold_ = config_.threshold;
    minLineLength_ = config_.minLineLength;
    maxLineGap_ = config_.maxLineGap;
  }

  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 in_image = cv_bridge::toCvShare(msg, sensor_msgs::image_encodings::BGR8)->image;
      cv::Mat src_gray;

      if (in_image.channels() > 1)
      {
        cv::cvtColor(in_image, src_gray, cv::COLOR_BGR2GRAY);
        Canny(src_gray, in_image, 50, 200, 3);
      }
      else
      {
        bool is_filtered = true;
        for (int y = 0; y < in_image.rows; ++y)
        {
          for (int x = 0; x < in_image.cols; ++x)
          {
            if (!(in_image.at<unsigned char>(y, x) == 0 || in_image.at<unsigned char>(y, x) == 255))
            {
              is_filtered = false;
              break;
            }
            if (!is_filtered)
            {
              break;
            }
          }
        }

        if (!is_filtered)
        {
          Canny(in_image, in_image, 50, 200, 3);
        }
      }

      cv::Mat out_image;
      cv::cvtColor(in_image, out_image, CV_GRAY2BGR);

      // Messages
      opencv_apps::LineArrayStamped lines_msg;
      lines_msg.header = msg->header;

      // Do the work
      std::vector<cv::Rect> faces;

      if (debug_view_)
      {
        char thresh_label[50];
        sprintf(thresh_label, "Thres: %d + input", min_threshold_);

        cv::namedWindow(window_name_, cv::WINDOW_AUTOSIZE);
        cv::createTrackbar(thresh_label, window_name_, &threshold_, max_threshold_, trackbarCallback);
        if (need_config_update_)
        {
          config_.threshold = threshold_;
          reconfigure_server_->updateConfig(config_);
          need_config_update_ = false;
        }
      }

      switch (config_.hough_type)
      {
        case opencv_apps::HoughLines_Standard_Hough_Transform:
        {
          std::vector<cv::Vec2f> s_lines;

          cv::HoughLines(in_image, s_lines, rho_, theta_ * CV_PI / 180, threshold_, minLineLength_, maxLineGap_);

          for (const cv::Vec2f& s_line : s_lines)
          {
            float r = s_line[0], t = s_line[1];
            double cos_t = cos(t), sin_t = sin(t);
            double x0 = r * cos_t, y0 = r * sin_t;
            double alpha = 1000;

            cv::Point pt1(cvRound(x0 + alpha * (-sin_t)), cvRound(y0 + alpha * cos_t));
            cv::Point pt2(cvRound(x0 - alpha * (-sin_t)), cvRound(y0 - alpha * cos_t));
#ifndef CV_VERSION_EPOCH
            cv::line(out_image, pt1, pt2, cv::Scalar(255, 0, 0), 3, cv::LINE_AA);
#else
            cv::line(out_image, pt1, pt2, cv::Scalar(255, 0, 0), 3, CV_AA);
#endif
            opencv_apps::Line line_msg;
            line_msg.pt1.x = pt1.x;
            line_msg.pt1.y = pt1.y;
            line_msg.pt2.x = pt2.x;
            line_msg.pt2.y = pt2.y;
            lines_msg.lines.push_back(line_msg);
          }

          break;
        }
        case opencv_apps::HoughLines_Probabilistic_Hough_Transform:
        default:
        {
          std::vector<cv::Vec4i> p_lines;

          cv::HoughLinesP(in_image, p_lines, rho_, theta_ * CV_PI / 180, threshold_, minLineLength_, maxLineGap_);

          for (const cv::Vec4i& l : p_lines)
          {
#ifndef CV_VERSION_EPOCH
            cv::line(out_image, cv::Point(l[0], l[1]), cv::Point(l[2], l[3]), cv::Scalar(255, 0, 0), 3, cv::LINE_AA);
#else
            cv::line(out_image, cv::Point(l[0], l[1]), cv::Point(l[2], l[3]), cv::Scalar(255, 0, 0), 3, CV_AA);
#endif
            opencv_apps::Line line_msg;
            line_msg.pt1.x = l[0];
            line_msg.pt1.y = l[1];
            line_msg.pt2.x = l[2];
            line_msg.pt2.y = l[3];
            lines_msg.lines.push_back(line_msg);
          }

          break;
        }
      }

      //-- Show what you got
      if (debug_view_)
      {
        cv::imshow(window_name_, out_image);
        int c = cv::waitKey(1);
      }

      // Publish the image.
      sensor_msgs::Image::Ptr out_img = cv_bridge::CvImage(msg->header, "bgr8", out_image).toImageMsg();
      img_pub_.publish(out_img);
      msg_pub_.publish(lines_msg);
    }
    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_, &HoughLinesNodelet::imageCallbackWithInfo, this);
    else
      img_sub_ = it_->subscribe("image", queue_size_, &HoughLinesNodelet::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_ = "Hough Lines Demo";
    min_threshold_ = 50;
    max_threshold_ = 150;
    threshold_ = max_threshold_;

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

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

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

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

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