{
  "version": 3,
  "provenance": {
    "dataset": "MEVA KF1",
    "url": "https://mevadata.org/",
    "license": "CC BY 4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "credit": "MEVA dataset, Kitware / IARPA DIVA. Corona, Osterdahl, Collins and Hoogs (WACV 2021).",
    "changes": "Continuous source excerpts, scaled to 960x540 and encoded as H.264 with no audio. Detector overlays were recomputed on the encoded clips at 10 samples/second. Saved AI assessments refer to the earlier sampled stills of the same interval; they were not regenerated. Browser review actions do not trigger live inference or dispatch."
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        "attention": "none"
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              "label": "11",
              "category": "person"
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      ],
      "assessment": {
        "summary": "Multiple people are waiting in a public lobby area with no signs of restricted entry, obstruction, or immediate danger.",
        "observations": [
          "Individuals are seated on benches and standing near the entrance, consistent with ordinary pedestrian activity."
        ],
        "uncertainty": "The specific identities and intentions of the individuals cannot be verified from the provided stills.",
        "attention": "none"
      },
      "reasons": [
        "person_detected"
      ],
      "video": "assets/lobby.mp4",
      "poster": "assets/lobby-0.png",
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      "overlay_processing": {
        "duplicates_removed": 0,
        "tracks_created": {
          "person": 13
        },
        "continuity_recoveries": [
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            "track_id": "lobby:person:03",
            "gap_seconds": 1.4,
            "points": 13,
            "support": 1.0,
            "appearance_distance": 0.338
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          {
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            "track_id": "lobby:person:07",
            "gap_seconds": 1.3,
            "points": 60,
            "support": 1.0,
            "appearance_distance": 0.118
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        ],
        "scene_cuts": 0
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  "detector": {
    "model": "YOLOX-s",
    "weights_sha256": "c5c2d13e59ae883e6af3b45daea64af4833a4951c92d116ec270d9ddbe998063",
    "threshold": 0.5,
    "sample_fps": 10,
    "score_is_calibrated_probability": false,
    "tracking": "clip-local geometry and pixel continuity",
    "display": "Most recent observed sample, at most 0.2 seconds old. Clip-local IDs use geometry, short-lived image features and color consistency; no boxes are drawn during missed detections."
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  "overlay_processing": {
    "version": 2,
    "duplicate_iou": 0.75,
    "max_gap_seconds": 0.7,
    "association": "One-to-one geometry matching; bounded gap recovery requires forward/backward optical flow, color consistency and an unambiguous match. Camera cuts reset continuity.",
    "vehicle_labels": "Vehicle IDs deliberately avoid unstable car/truck subtype guesses.",
    "limits": "Appearance and motion are local evidence, not verified identity. Occlusion, similar clothing and camera cuts can still break tracks. No biometric or cross-camera recognition.",
    "recovery_gap_seconds": 2.5
  }
}