range_filter.h

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#ifndef LASER_SCAN_RANGE_FILTER_H
#define LASER_SCAN_RANGE_FILTER_H

#include "filters/filter_base.h"
#include "sensor_msgs/LaserScan.h"

namespace laser_filters
{

class LaserScanRangeFilter : public filters::FilterBase<sensor_msgs::LaserScan>
{
public:

  double lower_threshold_ ;
  double upper_threshold_ ;
  bool use_message_range_limits_ ;
  float lower_replacement_value_ ;
  float upper_replacement_value_ ;

  bool configure()
  {
    use_message_range_limits_ = false;
    getParam("use_message_range_limits", use_message_range_limits_);

    // work around the not implemented getParam(std::string name, float& value) method
    double temp_replacement_value = std::numeric_limits<double>::quiet_NaN();
    getParam("lower_replacement_value", temp_replacement_value);
    lower_replacement_value_ = static_cast<float>(temp_replacement_value);

    // work around the not implemented getParam(std::string name, float& value) method
    temp_replacement_value = std::numeric_limits<double>::quiet_NaN();
    getParam("upper_replacement_value", temp_replacement_value);
    upper_replacement_value_ = static_cast<float>(temp_replacement_value);


    lower_threshold_ = 0.0;
    upper_threshold_ = 100000.0;
    getParam("lower_threshold", lower_threshold_);
    getParam("upper_threshold", upper_threshold_) ;
    return true;
  }

  virtual ~LaserScanRangeFilter()
  {

  }

  bool update(const sensor_msgs::LaserScan& input_scan, sensor_msgs::LaserScan& filtered_scan)
  {
    if (use_message_range_limits_)
    {
      lower_threshold_ = input_scan.range_min;
      upper_threshold_ = input_scan.range_max;
    }
    filtered_scan = input_scan;
    for (unsigned int i=0;
         i < input_scan.ranges.size();
         i++) // Need to check ever reading in the current scan
    {

      if (filtered_scan.ranges[i] <= lower_threshold_)
      {
        filtered_scan.ranges[i] = lower_replacement_value_;

      }
      else if (filtered_scan.ranges[i] >= upper_threshold_)
      {
        filtered_scan.ranges[i] = upper_replacement_value_;
      }
    }

    return true;
  }
} ;

}

#endif // LASER_SCAN_RANGE_FILTER_H