Dwell Time 및 존 분석 워크플로

def run(self, image, detections):
    if not hasattr(self, 'seen_tracker_ids_by_video'):
        self.seen_tracker_ids_by_video = {}
    video_key = 'default'
    try:
        video_metadata = getattr(image, 'video_metadata', None)
        if isinstance(video_metadata, dict):
            video_key = str(
                video_metadata.get('video_identifier') or video_metadata.get('source_id') or video_metadata.get('run_id') or 'default'
            )
        elif video_metadata is not None:
            video_key = str(
                getattr(video_metadata, 'video_identifier', None)
                or getattr(video_metadata, 'source_id', None)
                or getattr(video_metadata, 'run_id', None)
                or 'default'
            )
    except Exception:
        video_key = 'default'
    seen = self.seen_tracker_ids_by_video.setdefault(video_key, set())
    tracker_ids = getattr(detections, 'tracker_id', None)
    if tracker_ids is not None:
        for tracker_id in tracker_ids:
            if tracker_id is None:
                continue
            try:
                tracker_id_int = int(tracker_id)
            except Exception:
                continue
            if tracker_id_int >= 0:
                seen.add(tracker_id_int)
    return {'count': int(len(seen))}