face_detection.cpp

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/******************************************************************************
Copyright 2015 RAPP

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

******************************************************************************/

#include <face_detection/face_detection.h>


FaceDetection::FaceDetection(void)
{
  // Fetching the service topic URI parameter
  if(!nh_.getParam("/rapp_face_detection_detect_faces_topic", faceDetectionTopic_))
  {
    ROS_ERROR("Face detection topic param does not exist");
  }
  // Creating the service server concerning the face detection functionality
  faceDetectionService_ = nh_.advertiseService(faceDetectionTopic_,
    &FaceDetection::faceDetectionCallback, this);
}

bool FaceDetection::faceDetectionCallback(
  rapp_platform_ros_communications::FaceDetectionRosSrv::Request& req,
  rapp_platform_ros_communications::FaceDetectionRosSrv::Response& res)
{
  std::vector<unsigned int [4]> history;
  std::vector<cv::Rect> faces = face_detector_.findFaces(req.imageFilename,
    req.fast);

  for(unsigned int i = 0 ; i < faces.size() ; i++)
  {

    unsigned int temp[4];
    temp[0] = faces[i].x;
    temp[1] = faces[i].y;
    temp[2] = faces[i].x + faces[i].width;
    temp[3] = faces[i].y + faces[i].height;

    bool duplicate = false;
    for(unsigned int j = 0 ; j < history.size() ; j++)
    {
      if(temp[0] == history[j][0] && temp[1] == history[j][1] &&
         temp[2] == history[j][2] && temp[3] == history[j][3])
      {
        duplicate = true;
        break;
      }
    }
    if(duplicate)
    {
      continue;
    }

    geometry_msgs::PointStamped up_left_corner;
    geometry_msgs::PointStamped down_right_corner;

    up_left_corner.point.x = temp[0];
    up_left_corner.point.y = temp[1];
    down_right_corner.point.x = temp[2];
    down_right_corner.point.y = temp[3];

    res.faces_up_left.push_back(up_left_corner);
    res.faces_down_right.push_back(down_right_corner);
  }

  return true;
}