range_sensor_error_visualization.cpp

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// -*- mode: c++ -*-
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#define BOOST_PARAMETER_MAX_ARITY 7

#include <ros/ros.h>

#include <sensor_msgs/LaserScan.h>
#include <sensor_msgs/Image.h>
#include <cv_bridge/cv_bridge.h>
#include <sensor_msgs/image_encodings.h>
#include <jsk_recognition_msgs/PlotData.h>
#include "one_data_stat.h"

using namespace jsk_pcl_ros;

void generateImage(const std::vector<OneDataStat::Ptr>& stats,
                   cv::Mat& image,
                   boost::function<double(OneDataStat&)> accessor)
{
  // Scan values in order to compute min and max
  typedef boost::accumulators::accumulator_set<
    double,
    boost::accumulators::stats<boost::accumulators::tag::min,
                               boost::accumulators::tag::max> > MinMaxAccumulator;
  MinMaxAccumulator acc;
  for (size_t i = 0; i < stats.size(); i++) {
    acc(accessor(*stats[i]));
  }
  
  double min = boost::accumulators::min(acc);
  double max = boost::accumulators::max(acc);

  for (size_t i = 0; i < stats.size(); i++) {
    double v = accessor(*stats[i]);
    double relative_value = (v - min) / (max - min);
    image.at<float>(0, i) = relative_value;
  }
}

std::vector<OneDataStat::Ptr> g_data;

ros::Publisher pub_mean, pub_variance, pub_stddev;

ros::Publisher pub_variance_plot, pub_stddev_plot;

void publishImage(const cv::Mat& image, ros::Publisher& pub)
{
  std_msgs::Header header;
  header.stamp = ros::Time::now();
  pub.publish(cv_bridge::CvImage(
                header, sensor_msgs::image_encodings::TYPE_32FC1, image).toImageMsg());
}

void callback(const sensor_msgs::LaserScan::ConstPtr& msg)
{
  if (g_data.size() == 0) {
    // first time, g_data is not initialized
    for (size_t i = 0; i < msg->ranges.size(); i++) {
      g_data.push_back(OneDataStat::Ptr(new OneDataStat()));
    }
  }
  if (g_data.size() != msg->ranges.size()) {
    ROS_ERROR("Size of g_data and ~input/ranges are not same");
    return;
  }

  for (size_t i = 0; i < msg->ranges.size(); i++) {
    g_data[i]->addData(msg->ranges[i]);
  }

  // Visualize current error and so on
  if (g_data[0]->count() > 2) {
    // compute only if it receives two more images.
    // because no stats can be computed with one message.
    cv::Mat mean_image(1, msg->ranges.size(), CV_32FC1);
    cv::Mat variance_image(1, msg->ranges.size(), CV_32FC1);
    cv::Mat stddev_image(1, msg->ranges.size(), CV_32FC1);
    generateImage(g_data, mean_image, &mean);
    generateImage(g_data, variance_image, &variance);
    generateImage(g_data, stddev_image, &stddev);
    publishImage(mean_image, pub_mean);
    publishImage(variance_image, pub_variance);
    publishImage(stddev_image, pub_stddev);

    jsk_recognition_msgs::PlotData plot_data;
    jsk_recognition_msgs::PlotData plot_stddev_data;
    for (size_t i = 0; i < g_data.size(); i++) {
      double x = g_data[i]->mean();
      double y = g_data[i]->variance();
      double stddev = g_data[i]->stddev();
      if (x > 1.0 && x < 40 && stddev < 0.100) {            // 10cm
        plot_data.xs.push_back(x);
        plot_data.ys.push_back(y);
        plot_stddev_data.xs.push_back(x);
        plot_stddev_data.ys.push_back(stddev);
      }
    }
    pub_variance_plot.publish(plot_data);
    pub_stddev_plot.publish(plot_stddev_data);
  }
}

int main(int argc, char** argv)
{
  ros::init(argc, argv, "range_sensor_error_visualization");
  ros::NodeHandle pnh("~");

  // Setup publishers before subscribe topic
  pub_mean = pnh.advertise<sensor_msgs::Image>("output/mean", 1);
  pub_variance = pnh.advertise<sensor_msgs::Image>("output/variance", 1);
  pub_stddev = pnh.advertise<sensor_msgs::Image>("output/stddev", 1);
  pub_variance_plot = pnh.advertise<jsk_recognition_msgs::PlotData>("output/variance_plot", 1);
  pub_stddev_plot = pnh.advertise<jsk_recognition_msgs::PlotData>("output/stddev_plot", 1);
  ros::Subscriber sub = pnh.subscribe("input", 1, &callback);
  ros::spin();

}