extract_images.cpp

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#include <opencv2/highgui/highgui.hpp>

#include <ros/ros.h>
#include <sensor_msgs/Image.h>
#include <cv_bridge/cv_bridge.h>
#include <image_transport/image_transport.h>

#include <boost/thread.hpp>
#include <boost/format.hpp>

class ExtractImages
{
private:
  image_transport::Subscriber sub_;

  sensor_msgs::ImageConstPtr last_msg_;
  boost::mutex image_mutex_;

  std::string window_name_;
  boost::format filename_format_;
  int count_;
  double _time;
  double sec_per_frame_;

#if defined(_VIDEO)
  CvVideoWriter* video_writer;
#endif //_VIDEO

public:
  ExtractImages(const ros::NodeHandle& nh, const std::string& transport)
    : filename_format_(""), count_(0), _time(ros::Time::now().toSec())
  {
    std::string topic = nh.resolveName("image");
    ros::NodeHandle local_nh("~");

    std::string format_string;
    local_nh.param("filename_format", format_string, std::string("frame%04i.jpg"));
    filename_format_.parse(format_string);

    local_nh.param("sec_per_frame", sec_per_frame_, 0.1);

    image_transport::ImageTransport it(nh);
    sub_ = it.subscribe(topic, 1, &ExtractImages::image_cb, this, transport);

#if defined(_VIDEO)
    video_writer = 0;
#endif

    ROS_INFO("Initialized sec per frame to %f", sec_per_frame_);
  }

  ~ExtractImages()
  {
  }

  void image_cb(const sensor_msgs::ImageConstPtr& msg)
  {
    boost::lock_guard<boost::mutex> guard(image_mutex_);

    // Hang on to message pointer for sake of mouse_cb
    last_msg_ = msg;

    // May want to view raw bayer data
    // NB: This is hacky, but should be OK since we have only one image CB.
    if (msg->encoding.find("bayer") != std::string::npos)
      boost::const_pointer_cast<sensor_msgs::Image>(msg)->encoding = "mono8";

    cv::Mat image;
    try
    {
      image = cv_bridge::toCvShare(msg, "bgr8")->image;
    } catch(cv_bridge::Exception)
    {
      ROS_ERROR("Unable to convert %s image to bgr8", msg->encoding.c_str());
    }

    double delay = ros::Time::now().toSec()-_time;
    if(delay >= sec_per_frame_)
    {
      _time = ros::Time::now().toSec();

      if (!image.empty()) {
        std::string filename = (filename_format_ % count_).str();

#if !defined(_VIDEO)
        cv::imwrite(filename, image);
#else
        if(!video_writer)
        {
            video_writer = cvCreateVideoWriter("video.avi", CV_FOURCC('M','J','P','G'),
                int(1.0/sec_per_frame_), cvSize(image->width, image->height));
        }

        cvWriteFrame(video_writer, image);
#endif // _VIDEO

        ROS_INFO("Saved image %s", filename.c_str());
        count_++;
      } else {
        ROS_WARN("Couldn't save image, no data!");
      }
    }
  }
};

int main(int argc, char **argv)
{
  ros::init(argc, argv, "extract_images", ros::init_options::AnonymousName);
  ros::NodeHandle n;
  if (n.resolveName("image") == "/image") {
    ROS_WARN("extract_images: image has not been remapped! Typical command-line usage:\n"
             "\t$ ./extract_images image:=<image topic> [transport]");
  }

  ExtractImages view(n, (argc > 1) ? argv[1] : "raw");

  ros::spin();

  return 0;
}