Minor fix

AlexeyAB

2018-03-13 df076653e00db69c6fb57869981f5196a8f55e70

 src/yolo_v2_class.hpp

@@ -144,7 +144,8 @@
};


#if defined(TRACK_OPTFLOW) && defined(OPENCV)

#if defined(TRACK_OPTFLOW) && defined(OPENCV) && defined(GPU)

#include <opencv2/cudaoptflow.hpp>
#include <opencv2/cudaimgproc.hpp>
@@ -158,7 +159,7 @@
   const int flow_error;


   Tracker_optflow(int _gpu_id = 0, int win_size = 7, int max_level = 1, int iterations = 8000, int _flow_error = -1) :
   Tracker_optflow(int _gpu_id = 0, int win_size = 9, int max_level = 3, int iterations = 8000, int _flow_error = -1) :
      gpu_count(cv::cuda::getCudaEnabledDeviceCount()), gpu_id(std::min(_gpu_id, gpu_count-1)),
      flow_error((_flow_error > 0)? _flow_error:(win_size*4))
   {
@@ -192,8 +193,7 @@
   void update_cur_bbox_vec(std::vector<bbox_t> _cur_bbox_vec)
   {
      cur_bbox_vec = _cur_bbox_vec;
      good_bbox_vec_flags.resize(cur_bbox_vec.size());
      for (auto &i : good_bbox_vec_flags) i = true;
      good_bbox_vec_flags = std::vector<bool>(cur_bbox_vec.size(), true);
      cv::Mat prev_pts, cur_pts_flow_cpu;

      for (auto &i : cur_bbox_vec) {
@@ -296,7 +296,8 @@
            float moved_y = cur_key_pt.y - prev_key_pt.y;

            if (abs(moved_x) < 100 && abs(moved_y) < 100 && good_bbox_vec_flags[i])
               if (err_cpu.at<float>(0, i) < flow_error && status_cpu.at<unsigned char>(0, i) != 0)
               if (err_cpu.at<float>(0, i) < flow_error && status_cpu.at<unsigned char>(0, i) != 0 &&
                  ((float)cur_bbox_vec[i].x + moved_x) > 0 && ((float)cur_bbox_vec[i].y + moved_y) > 0)
               {
                  cur_bbox_vec[i].x += moved_x + 0.5;
                  cur_bbox_vec[i].y += moved_y + 0.5;
@@ -319,9 +320,271 @@
   }

};

#elif defined(TRACK_OPTFLOW) && defined(OPENCV)

//#include <opencv2/optflow.hpp>
#include <opencv2/video/tracking.hpp>

class Tracker_optflow {
public:
   const int flow_error;


   Tracker_optflow(int win_size = 9, int max_level = 3, int iterations = 8000, int _flow_error = -1) :
      flow_error((_flow_error > 0)? _flow_error:(win_size*4))
   {
      sync_PyrLKOpticalFlow = cv::SparsePyrLKOpticalFlow::create();
      sync_PyrLKOpticalFlow->setWinSize(cv::Size(win_size, win_size));  // 9, 15, 21, 31
      sync_PyrLKOpticalFlow->setMaxLevel(max_level);     // +- 3 pt

   }

   // just to avoid extra allocations
   cv::Mat dst_grey;
   cv::Mat prev_pts_flow, cur_pts_flow;
   cv::Mat status, err;

   cv::Mat src_grey; // used in both functions
   cv::Ptr<cv::SparsePyrLKOpticalFlow> sync_PyrLKOpticalFlow;

   std::vector<bbox_t> cur_bbox_vec;
   std::vector<bool> good_bbox_vec_flags;

   void update_cur_bbox_vec(std::vector<bbox_t> _cur_bbox_vec)
   {
      cur_bbox_vec = _cur_bbox_vec;
      good_bbox_vec_flags = std::vector<bool>(cur_bbox_vec.size(), true);
      cv::Mat prev_pts, cur_pts_flow;

      for (auto &i : cur_bbox_vec) {
         float x_center = (i.x + i.w / 2.0F);
         float y_center = (i.y + i.h / 2.0F);
         prev_pts.push_back(cv::Point2f(x_center, y_center));
      }

      if (prev_pts.rows == 0)
         prev_pts_flow = cv::Mat();
      else
         cv::transpose(prev_pts, prev_pts_flow);
   }


   void update_tracking_flow(cv::Mat new_src_mat, std::vector<bbox_t> _cur_bbox_vec)
   {
      if (new_src_mat.channels() == 3) {

         update_cur_bbox_vec(_cur_bbox_vec);

         cv::cvtColor(new_src_mat, src_grey, CV_BGR2GRAY, 1);
      }
   }


   std::vector<bbox_t> tracking_flow(cv::Mat new_dst_mat, bool check_error = true)
   {
      if (sync_PyrLKOpticalFlow.empty()) {
         std::cout << "sync_PyrLKOpticalFlow isn't initialized \n";
         return cur_bbox_vec;
      }

      cv::cvtColor(new_dst_mat, dst_grey, CV_BGR2GRAY, 1);

      if (src_grey.rows != dst_grey.rows || src_grey.cols != dst_grey.cols) {
         src_grey = dst_grey.clone();
         return cur_bbox_vec;
      }

      if (prev_pts_flow.cols < 1) {
         return cur_bbox_vec;
      }

      ////sync_PyrLKOpticalFlow_gpu.sparse(src_grey_gpu, dst_grey_gpu, prev_pts_flow_gpu, cur_pts_flow_gpu, status_gpu, &err_gpu);  // OpenCV 2.4.x
      sync_PyrLKOpticalFlow->calc(src_grey, dst_grey, prev_pts_flow, cur_pts_flow, status, err);   // OpenCV 3.x

      dst_grey.copyTo(src_grey);

      std::vector<bbox_t> result_bbox_vec;

      if (err.rows == cur_bbox_vec.size() && status.rows == cur_bbox_vec.size())
      {
         for (size_t i = 0; i < cur_bbox_vec.size(); ++i)
         {
            cv::Point2f cur_key_pt = cur_pts_flow.at<cv::Point2f>(0, i);
            cv::Point2f prev_key_pt = prev_pts_flow.at<cv::Point2f>(0, i);

            float moved_x = cur_key_pt.x - prev_key_pt.x;
            float moved_y = cur_key_pt.y - prev_key_pt.y;

            if (abs(moved_x) < 100 && abs(moved_y) < 100 && good_bbox_vec_flags[i])
               if (err.at<float>(0, i) < flow_error && status.at<unsigned char>(0, i) != 0 &&
                  ((float)cur_bbox_vec[i].x + moved_x) > 0 && ((float)cur_bbox_vec[i].y + moved_y) > 0)
               {
                  cur_bbox_vec[i].x += moved_x + 0.5;
                  cur_bbox_vec[i].y += moved_y + 0.5;
                  result_bbox_vec.push_back(cur_bbox_vec[i]);
               }
               else good_bbox_vec_flags[i] = false;
            else good_bbox_vec_flags[i] = false;

            //if(!check_error && !good_bbox_vec_flags[i]) result_bbox_vec.push_back(cur_bbox_vec[i]);
         }
      }

      prev_pts_flow = cur_pts_flow.clone();

      return result_bbox_vec;
   }

};
#else

class Tracker_optflow {};

#endif   // defined(TRACK_OPTFLOW) && defined(OPENCV) 
#endif   // defined(TRACK_OPTFLOW) && defined(OPENCV)


#ifdef OPENCV

cv::Scalar obj_id_to_color(int obj_id) {
   int const colors[6][3] = { { 1,0,1 },{ 0,0,1 },{ 0,1,1 },{ 0,1,0 },{ 1,1,0 },{ 1,0,0 } };
   int const offset = obj_id * 123457 % 6;
   int const color_scale = 150 + (obj_id * 123457) % 100;
   cv::Scalar color(colors[offset][0], colors[offset][1], colors[offset][2]);
   color *= color_scale;
   return color;
}

class preview_boxes_t {
   enum { frames_history = 30 }; // how long to keep the history saved

   struct preview_box_track_t {
      unsigned int track_id, obj_id, last_showed_frames_ago;
      bool current_detection;
      bbox_t bbox;
      cv::Mat mat_obj, mat_resized_obj;
      preview_box_track_t() : track_id(0), obj_id(0), last_showed_frames_ago(frames_history), current_detection(false) {}
   };
   std::vector<preview_box_track_t> preview_box_track_id;
   size_t const preview_box_size, bottom_offset;
   bool const one_off_detections;
public:
   preview_boxes_t(size_t _preview_box_size = 100, size_t _bottom_offset = 100, bool _one_off_detections = false) :
      preview_box_size(_preview_box_size), bottom_offset(_bottom_offset), one_off_detections(_one_off_detections)
   {}

   void set(cv::Mat src_mat, std::vector<bbox_t> result_vec)
   {
      size_t const count_preview_boxes = src_mat.cols / preview_box_size;
      if (preview_box_track_id.size() != count_preview_boxes) preview_box_track_id.resize(count_preview_boxes);

      // increment frames history
      for (auto &i : preview_box_track_id)
         i.last_showed_frames_ago = std::min((unsigned)frames_history, i.last_showed_frames_ago + 1);

      // occupy empty boxes
      for (auto &k : result_vec) {
         bool found = false;
         // find the same (track_id)
         for (auto &i : preview_box_track_id) {
            if (i.track_id == k.track_id) {
               if (!one_off_detections) i.last_showed_frames_ago = 0; // for tracked objects
               found = true;
               break;
            }
         }
         if (!found) {
            // find empty box
            for (auto &i : preview_box_track_id) {
               if (i.last_showed_frames_ago == frames_history) {
                  if (!one_off_detections && k.frames_counter == 0) break; // don't show if obj isn't tracked yet
                  i.track_id = k.track_id;
                  i.obj_id = k.obj_id;
                  i.bbox = k;
                  i.last_showed_frames_ago = 0;
                  break;
               }
            }
         }
      }

      // draw preview box (from old or current frame)
      for (size_t i = 0; i < preview_box_track_id.size(); ++i)
      {
         // get object image
         cv::Mat dst = preview_box_track_id[i].mat_resized_obj;
         preview_box_track_id[i].current_detection = false;

         for (auto &k : result_vec) {
            if (preview_box_track_id[i].track_id == k.track_id) {
               if (one_off_detections && preview_box_track_id[i].last_showed_frames_ago > 0) {
                  preview_box_track_id[i].last_showed_frames_ago = frames_history; break;
               }
               bbox_t b = k;
               cv::Rect r(b.x, b.y, b.w, b.h);
               cv::Rect img_rect(cv::Point2i(0, 0), src_mat.size());
               cv::Rect rect_roi = r & img_rect;
               if (rect_roi.width > 1 || rect_roi.height > 1) {
                  cv::Mat roi = src_mat(rect_roi);
                  cv::resize(roi, dst, cv::Size(preview_box_size, preview_box_size), cv::INTER_NEAREST);
                  preview_box_track_id[i].mat_obj = roi.clone();
                  preview_box_track_id[i].mat_resized_obj = dst.clone();
                  preview_box_track_id[i].current_detection = true;
                  preview_box_track_id[i].bbox = k;
               }
               break;
            }
         }
      }
   }


   void draw(cv::Mat draw_mat, bool show_small_boxes = false)
   {
      // draw preview box (from old or current frame)
      for (size_t i = 0; i < preview_box_track_id.size(); ++i)
      {
         auto &prev_box = preview_box_track_id[i];

         // draw object image
         cv::Mat dst = prev_box.mat_resized_obj;
         if (prev_box.last_showed_frames_ago < frames_history &&
            dst.size() == cv::Size(preview_box_size, preview_box_size))
         {
            cv::Rect dst_rect_roi(cv::Point2i(i * preview_box_size, draw_mat.rows - bottom_offset), dst.size());
            cv::Mat dst_roi = draw_mat(dst_rect_roi);
            dst.copyTo(dst_roi);

            cv::Scalar color = obj_id_to_color(prev_box.obj_id);
            int thickness = (prev_box.current_detection) ? 5 : 1;
            cv::rectangle(draw_mat, dst_rect_roi, color, thickness);

            unsigned int const track_id = prev_box.track_id;
            std::string track_id_str = (track_id > 0) ? std::to_string(track_id) : "";
            putText(draw_mat, track_id_str, dst_rect_roi.tl() - cv::Point2i(-4, 5), cv::FONT_HERSHEY_COMPLEX_SMALL, 0.9, cv::Scalar(0, 0, 0), 2);

            std::string size_str = std::to_string(prev_box.bbox.w) + "x" + std::to_string(prev_box.bbox.h);
            putText(draw_mat, size_str, dst_rect_roi.tl() + cv::Point2i(0, 12), cv::FONT_HERSHEY_COMPLEX_SMALL, 0.8, cv::Scalar(0, 0, 0), 1);

            if (!one_off_detections && prev_box.current_detection) {
               cv::line(draw_mat, dst_rect_roi.tl() + cv::Point2i(preview_box_size, 0),
                  cv::Point2i(prev_box.bbox.x, prev_box.bbox.y + prev_box.bbox.h),
                  color);
            }

            if (one_off_detections && show_small_boxes) {
               cv::Rect src_rect_roi(cv::Point2i(prev_box.bbox.x, prev_box.bbox.y),
                  cv::Size(prev_box.bbox.w, prev_box.bbox.h));
               unsigned int const color_history = (255 * prev_box.last_showed_frames_ago) / frames_history;
               color = cv::Scalar(255 - 3 * color_history, 255 - 2 * color_history, 255 - 1 * color_history);
               if (prev_box.mat_obj.size() == src_rect_roi.size()) {
                  prev_box.mat_obj.copyTo(draw_mat(src_rect_roi));
               }
               cv::rectangle(draw_mat, src_rect_roi, color, thickness);
               putText(draw_mat, track_id_str, src_rect_roi.tl() - cv::Point2i(0, 10), cv::FONT_HERSHEY_COMPLEX_SMALL, 0.8, cv::Scalar(0, 0, 0), 1);
            }
         }
      }
   }
};
#endif   // OPENCV