import numpy as np from collections import deque import itertools import os import os.path as osp import time import torch import cv2 import torch.nn.functional as F from models.model import create_model, load_model from models.decode import mot_decode from tracking_utils.utils import * from tracking_utils.log import logger from tracking_utils.kalman_filter import KalmanFilter from models import * from tracker import matching from .basetrack import BaseTrack, TrackState from utils.post_process import ctdet_post_process from utils.image import get_affine_transform from models.utils import _tranpose_and_gather_feat class STrack(BaseTrack): shared_kalman = KalmanFilter() def __init__(self, tlwh, score, temp_feat, buffer_size=30): # wait activate self._tlwh = np.asarray(tlwh, dtype=np.float) self.kalman_filter = None self.mean, self.covariance = None, None self.is_activated = False self.score = score self.score_list = [] self.tracklet_len = 0 self.smooth_feat = None self.update_features(temp_feat) self.features = deque([], maxlen=buffer_size) self.alpha = 0.9 def update_features(self, feat): feat /= np.linalg.norm(feat) self.curr_feat = feat if self.smooth_feat is None: self.smooth_feat = feat else: self.smooth_feat = self.alpha * self.smooth_feat + (1 - self.alpha) * feat self.features.append(feat) self.smooth_feat /= np.linalg.norm(self.smooth_feat) def predict(self): mean_state = self.mean.copy() if self.state != TrackState.Tracked: mean_state[7] = 0 self.mean, self.covariance = self.kalman_filter.predict(mean_state, self.covariance) @staticmethod def multi_predict(stracks): if len(stracks) > 0: multi_mean = np.asarray([st.mean.copy() for st in stracks]) multi_covariance = np.asarray([st.covariance for st in stracks]) for i, st in enumerate(stracks): if st.state != TrackState.Tracked: multi_mean[i][7] = 0 multi_mean, multi_covariance = STrack.shared_kalman.multi_predict(multi_mean, multi_covariance) for i, (mean, cov) in enumerate(zip(multi_mean, multi_covariance)): stracks[i].mean = mean stracks[i].covariance = cov def activate(self, kalman_filter, frame_id): """Start a new tracklet""" self.kalman_filter = kalman_filter self.track_id = self.next_id() self.mean, self.covariance = self.kalman_filter.initiate(self.tlwh_to_xyah(self._tlwh)) self.tracklet_len = 0 self.state = TrackState.Tracked if frame_id == 1: self.is_activated = True #self.is_activated = True self.frame_id = frame_id self.start_frame = frame_id self.score_list.append(self.score) def re_activate(self, new_track, frame_id, new_id=False): self.mean, self.covariance = self.kalman_filter.update( self.mean, self.covariance, self.tlwh_to_xyah(new_track.tlwh) ) self.update_features(new_track.curr_feat) self.tracklet_len = 0 self.state = TrackState.Tracked self.is_activated = True self.frame_id = frame_id if new_id: self.track_id = self.next_id() self.score = new_track.score self.score_list.append(self.score) def update(self, new_track, frame_id, update_feature=True): """ Update a matched track :type new_track: STrack :type frame_id: int :type update_feature: bool :return: """ self.frame_id = frame_id self.tracklet_len += 1 new_tlwh = new_track.tlwh self.mean, self.covariance = self.kalman_filter.update( self.mean, self.covariance, self.tlwh_to_xyah(new_tlwh)) self.state = TrackState.Tracked self.is_activated = True self.score = new_track.score self.score_list.append(self.score) if update_feature: self.update_features(new_track.curr_feat) @property # @jit(nopython=True) def tlwh(self): """Get current position in bounding box format `(top left x, top left y, width, height)`. """ if self.mean is None: return self._tlwh.copy() ret = self.mean[:4].copy() ret[2] *= ret[3] ret[:2] -= ret[2:] / 2 return ret @property # @jit(nopython=True) def tlbr(self): """Convert bounding box to format `(min x, min y, max x, max y)`, i.e., `(top left, bottom right)`. """ ret = self.tlwh.copy() ret[2:] += ret[:2] return ret @staticmethod # @jit(nopython=True) def tlwh_to_xyah(tlwh): """Convert bounding box to format `(center x, center y, aspect ratio, height)`, where the aspect ratio is `width / height`. """ ret = np.asarray(tlwh).copy() ret[:2] += ret[2:] / 2 ret[2] /= ret[3] return ret def to_xyah(self): return self.tlwh_to_xyah(self.tlwh) @staticmethod # @jit(nopython=True) def tlbr_to_tlwh(tlbr): ret = np.asarray(tlbr).copy() ret[2:] -= ret[:2] return ret @staticmethod # @jit(nopython=True) def tlwh_to_tlbr(tlwh): ret = np.asarray(tlwh).copy() ret[2:] += ret[:2] return ret def __repr__(self): return 'OT_{}_({}-{})'.format(self.track_id, self.start_frame, self.end_frame) class JDETracker(object): def __init__(self, opt, frame_rate=30): self.opt = opt if opt.gpus[0] >= 0: opt.device = torch.device('cuda') else: opt.device = torch.device('cpu') print('Creating model...') self.model = create_model(opt.arch, opt.heads, opt.head_conv) self.model = load_model(self.model, opt.load_model) self.model = self.model.to(opt.device) self.model.eval() self.tracked_stracks = [] # type: list[STrack] self.lost_stracks = [] # type: list[STrack] self.removed_stracks = [] # type: list[STrack] self.frame_id = 0 #self.det_thresh = opt.conf_thres self.det_thresh = opt.conf_thres + 0.1 self.buffer_size = int(frame_rate / 30.0 * opt.track_buffer) self.max_time_lost = self.buffer_size self.max_per_image = opt.K self.mean = np.array(opt.mean, dtype=np.float32).reshape(1, 1, 3) self.std = np.array(opt.std, dtype=np.float32).reshape(1, 1, 3) self.kalman_filter = KalmanFilter() def post_process(self, dets, meta): dets = dets.detach().cpu().numpy() dets = dets.reshape(1, -1, dets.shape[2]) dets = ctdet_post_process( dets.copy(), [meta['c']], [meta['s']], meta['out_height'], meta['out_width'], self.opt.num_classes) for j in range(1, self.opt.num_classes + 1): dets[0][j] = np.array(dets[0][j], dtype=np.float32).reshape(-1, 5) return dets[0] def merge_outputs(self, detections): results = {} for j in range(1, self.opt.num_classes + 1): results[j] = np.concatenate( [detection[j] for detection in detections], axis=0).astype(np.float32) scores = np.hstack( [results[j][:, 4] for j in range(1, self.opt.num_classes + 1)]) if len(scores) > self.max_per_image: kth = len(scores) - self.max_per_image thresh = np.partition(scores, kth)[kth] for j in range(1, self.opt.num_classes + 1): keep_inds = (results[j][:, 4] >= thresh) results[j] = results[j][keep_inds] return results def update(self, im_blob, img0): self.frame_id += 1 activated_starcks = [] refind_stracks = [] lost_stracks = [] removed_stracks = [] width = img0.shape[1] height = img0.shape[0] inp_height = im_blob.shape[2] inp_width = im_blob.shape[3] c = np.array([width / 2., height / 2.], dtype=np.float32) s = max(float(inp_width) / float(inp_height) * height, width) * 1.0 meta = {'c': c, 's': s, 'out_height': inp_height // self.opt.down_ratio, 'out_width': inp_width // self.opt.down_ratio} ''' Step 1: Network forward, get detections & embeddings''' with torch.no_grad(): output = self.model(im_blob)[-1] hm = output['hm'].sigmoid_() wh = output['wh'] id_feature = output['id'] id_feature = F.normalize(id_feature, dim=1) reg = output['reg'] if self.opt.reg_offset else None dets, inds = mot_decode(hm, wh, reg=reg, ltrb=self.opt.ltrb, K=self.opt.K) id_feature = _tranpose_and_gather_feat(id_feature, inds) id_feature = id_feature.squeeze(0) id_feature = id_feature.cpu().numpy() dets = self.post_process(dets, meta) dets = self.merge_outputs([dets])[1] remain_inds = dets[:, 4] > self.opt.conf_thres inds_low = dets[:, 4] > 0.2 #inds_low = dets[:, 4] > self.opt.conf_thres inds_high = dets[:, 4] < self.opt.conf_thres inds_second = np.logical_and(inds_low, inds_high) dets_second = dets[inds_second] id_feature_second = id_feature[inds_second] dets = dets[remain_inds] id_feature = id_feature[remain_inds] # vis ''' for i in range(0, dets.shape[0]): bbox = dets[i][0:4] cv2.rectangle(img0, (bbox[0], bbox[1]), (bbox[2], bbox[3]), (0, 255, 0), 2) cv2.imshow('dets', img0) cv2.waitKey(0) id0 = id0-1 ''' if len(dets) > 0: '''Detections''' detections = [STrack(STrack.tlbr_to_tlwh(tlbrs[:4]), tlbrs[4], f, 30) for (tlbrs, f) in zip(dets[:, :5], id_feature)] else: detections = [] ''' Add newly detected tracklets to tracked_stracks''' unconfirmed = [] tracked_stracks = [] # type: list[STrack] for track in self.tracked_stracks: if not track.is_activated: unconfirmed.append(track) else: tracked_stracks.append(track) ''' Step 2: First association, with embedding''' strack_pool = joint_stracks(tracked_stracks, self.lost_stracks) # Predict the current location with KF STrack.multi_predict(strack_pool) dists = matching.embedding_distance(strack_pool, detections) #dists = matching.fuse_iou(dists, strack_pool, detections) #dists = matching.iou_distance(strack_pool, detections) dists = matching.fuse_motion(self.kalman_filter, dists, strack_pool, detections) matches, u_track, u_detection = matching.linear_assignment(dists, thresh=self.opt.match_thres) for itracked, idet in matches: track = strack_pool[itracked] det = detections[idet] if track.state == TrackState.Tracked: track.update(detections[idet], self.frame_id) activated_starcks.append(track) else: track.re_activate(det, self.frame_id, new_id=False) refind_stracks.append(track) ''' Step 3: Second association, with IOU''' detections = [detections[i] for i in u_detection] r_tracked_stracks = [strack_pool[i] for i in u_track if strack_pool[i].state == TrackState.Tracked] dists = matching.iou_distance(r_tracked_stracks, detections) matches, u_track, u_detection = matching.linear_assignment(dists, thresh=0.5) for itracked, idet in matches: track = r_tracked_stracks[itracked] det = detections[idet] if track.state == TrackState.Tracked: track.update(det, self.frame_id) activated_starcks.append(track) else: track.re_activate(det, self.frame_id, new_id=False) refind_stracks.append(track) # association the untrack to the low score detections if len(dets_second) > 0: '''Detections''' detections_second = [STrack(STrack.tlbr_to_tlwh(tlbrs[:4]), tlbrs[4], f, 30) for (tlbrs, f) in zip(dets_second[:, :5], id_feature_second)] else: detections_second = [] second_tracked_stracks = [r_tracked_stracks[i] for i in u_track if r_tracked_stracks[i].state == TrackState.Tracked] dists = matching.iou_distance(second_tracked_stracks, detections_second) matches, u_track, u_detection_second = matching.linear_assignment(dists, thresh=0.4) for itracked, idet in matches: track = second_tracked_stracks[itracked] det = detections_second[idet] if track.state == TrackState.Tracked: track.update(det, self.frame_id) activated_starcks.append(track) else: track.re_activate(det, self.frame_id, new_id=False) refind_stracks.append(track) for it in u_track: #track = r_tracked_stracks[it] track = second_tracked_stracks[it] if not track.state == TrackState.Lost: track.mark_lost() lost_stracks.append(track) '''Deal with unconfirmed tracks, usually tracks with only one beginning frame''' detections = [detections[i] for i in u_detection] dists = matching.iou_distance(unconfirmed, detections) matches, u_unconfirmed, u_detection = matching.linear_assignment(dists, thresh=0.7) for itracked, idet in matches: unconfirmed[itracked].update(detections[idet], self.frame_id) activated_starcks.append(unconfirmed[itracked]) for it in u_unconfirmed: track = unconfirmed[it] track.mark_removed() removed_stracks.append(track) """ Step 4: Init new stracks""" for inew in u_detection: track = detections[inew] if track.score < self.det_thresh: continue track.activate(self.kalman_filter, self.frame_id) activated_starcks.append(track) """ Step 5: Update state""" for track in self.lost_stracks: if self.frame_id - track.end_frame > self.max_time_lost: track.mark_removed() removed_stracks.append(track) # print('Ramained match {} s'.format(t4-t3)) self.tracked_stracks = [t for t in self.tracked_stracks if t.state == TrackState.Tracked] self.tracked_stracks = joint_stracks(self.tracked_stracks, activated_starcks) self.tracked_stracks = joint_stracks(self.tracked_stracks, refind_stracks) self.lost_stracks = sub_stracks(self.lost_stracks, self.tracked_stracks) self.lost_stracks.extend(lost_stracks) self.lost_stracks = sub_stracks(self.lost_stracks, self.removed_stracks) self.removed_stracks.extend(removed_stracks) self.tracked_stracks, self.lost_stracks = remove_duplicate_stracks(self.tracked_stracks, self.lost_stracks) #self.tracked_stracks = remove_fp_stracks(self.tracked_stracks) # get scores of lost tracks output_stracks = [track for track in self.tracked_stracks if track.is_activated] logger.debug('===========Frame {}=========='.format(self.frame_id)) logger.debug('Activated: {}'.format([track.track_id for track in activated_starcks])) logger.debug('Refind: {}'.format([track.track_id for track in refind_stracks])) logger.debug('Lost: {}'.format([track.track_id for track in lost_stracks])) logger.debug('Removed: {}'.format([track.track_id for track in removed_stracks])) return output_stracks def joint_stracks(tlista, tlistb): exists = {} res = [] for t in tlista: exists[t.track_id] = 1 res.append(t) for t in tlistb: tid = t.track_id if not exists.get(tid, 0): exists[tid] = 1 res.append(t) return res def sub_stracks(tlista, tlistb): stracks = {} for t in tlista: stracks[t.track_id] = t for t in tlistb: tid = t.track_id if stracks.get(tid, 0): del stracks[tid] return list(stracks.values()) def remove_duplicate_stracks(stracksa, stracksb): pdist = matching.iou_distance(stracksa, stracksb) pairs = np.where(pdist < 0.15) dupa, dupb = list(), list() for p, q in zip(*pairs): timep = stracksa[p].frame_id - stracksa[p].start_frame timeq = stracksb[q].frame_id - stracksb[q].start_frame if timep > timeq: dupb.append(q) else: dupa.append(p) resa = [t for i, t in enumerate(stracksa) if not i in dupa] resb = [t for i, t in enumerate(stracksb) if not i in dupb] return resa, resb def remove_fp_stracks(stracksa, n_frame=10): remain = [] for t in stracksa: score_5 = t.score_list[-n_frame:] score_5 = np.array(score_5, dtype=np.float32) index = score_5 < 0.45 num = np.sum(index) if num < n_frame: remain.append(t) return remain