{
  "schema_version": "poc1024.identity_experiment.v13",
  "date": "2026-10-30",
  "status": "completed",
  "case": "AD8J03",
  "review_samples": [
    "V0106",
    "V0110"
  ],
  "conservatively_read_plate_tail": "D8J03",
  "source_sha256": "76cad12c0342ce2c55822470ab6396ac0579fcd6aa161ec9dd2abd17bb3d5f16",
  "weights_sha256": "646f8bc3fe0a656803d95c294f7852321748cb29d13466a1af8862e2db384a1b",
  "experiment": {
    "source_frame_interval": [
      0,
      3600
    ],
    "source_fps": 60,
    "raw_source_frames": 3600,
    "raw_inference_calls": 3600,
    "direct_conf030_verification_frames": 15,
    "direct_conf030_equivalence": true,
    "detector": "YOLO26s",
    "image_size": 640,
    "raw_conf": 0.05,
    "all_replay_input_conf": 0.3,
    "head_end2end": {
      "present": true,
      "value": false
    },
    "backend_end2end": {
      "present": true,
      "value": false
    },
    "actual_detector_iou": 0.7,
    "actual_agnostic_nms": false,
    "duplicate_suppression_vehicle_classes": [
      2,
      5,
      7
    ],
    "tracker_config": {
      "tracker_type": "bytetrack",
      "track_high_thresh": 0.25,
      "track_low_thresh": 0.1,
      "new_track_thresh": 0.25,
      "track_buffer": 30,
      "match_thresh": 0.8,
      "fuse_score": true
    },
    "versions": {
      "ultralytics": "8.4.191",
      "torch": "2.11.0+cu128",
      "cuda": "12.8"
    },
    "all_replays_start_at_source_frame_zero": true
  },
  "visually_confirmed_baseline_issue": {
    "track_ids": [
      473,
      1101
    ],
    "same_source_frame_count": 8,
    "overlap_iou_ge_0_8_count": 6,
    "coobserved_frames": [
      {
        "source_frame": 2743,
        "iou": 0.9696636434289405,
        "center_distance_over_reference_diagonal": 0.010039449240782662,
        "area_ratio": 1.022234197885625
      },
      {
        "source_frame": 2744,
        "iou": 0.9698724429397483,
        "center_distance_over_reference_diagonal": 0.0030733011727690275,
        "area_ratio": 0.9851695350436802
      },
      {
        "source_frame": 2745,
        "iou": 0.9671540031441134,
        "center_distance_over_reference_diagonal": 0.0013584878348684504,
        "area_ratio": 0.972297146578915
      },
      {
        "source_frame": 2756,
        "iou": 0.8767109499866034,
        "center_distance_over_reference_diagonal": 0.028673618161991432,
        "area_ratio": 0.894596053288929
      },
      {
        "source_frame": 2757,
        "iou": 0.9502462745973541,
        "center_distance_over_reference_diagonal": 0.011747153318306957,
        "area_ratio": 0.9570141850016584
      },
      {
        "source_frame": 2758,
        "iou": 0.9588170568669672,
        "center_distance_over_reference_diagonal": 0.007047522453128862,
        "area_ratio": 0.9588170568669672
      },
      {
        "source_frame": 2759,
        "iou": 0.7062229529157068,
        "center_distance_over_reference_diagonal": 0.06186820208494449,
        "area_ratio": 0.7062229529157068
      },
      {
        "source_frame": 2760,
        "iou": 0.6404307362239147,
        "center_distance_over_reference_diagonal": 0.08123188345887689,
        "area_ratio": 0.6404307362239147
      }
    ],
    "vehicle": "White/silver van carrying roof cargo; plate tail D8J03 checked in source crops",
    "review_method": "Assistant visual review of native-derived plate/vehicle contact sheet and same-frame evidence board"
  },
  "results": {
    "original": {
      "reference_frames": 1935,
      "matched_reference_frames": 1935,
      "geometrically_matched_id_count": 97,
      "multiple_matching_tracks_frame_count": 370,
      "missing_geometric_match_source_frames": [],
      "raw_target_coverage_before": 1935,
      "raw_target_coverage_after": 1935,
      "suppressed_boxes": 0,
      "cross_class_suppressed_boxes": 0,
      "neighbor_reference_observations": 11631,
      "neighbor_raw_covered_before": 11629,
      "neighbor_raw_covered_after": 11629,
      "neighbor_new_raw_coverage_losses": 0,
      "local_window": {
        "source_frame_interval": [
          2720,
          2841
        ],
        "reference_frames": 120,
        "matched_reference_frames": 120,
        "geometrically_matched_ids": {
          "473": 31,
          "1084": 4,
          "1101": 97,
          "1146": 4
        },
        "multiple_matching_tracks_frames": [
          2720,
          2721,
          2722,
          2724,
          2743,
          2744,
          2745,
          2756,
          2757,
          2758,
          2759,
          2760,
          2783,
          2784,
          2789,
          2791
        ]
      }
    },
    "vehicle_nms_070": {
      "reference_frames": 1935,
      "matched_reference_frames": 1934,
      "geometrically_matched_id_count": 1,
      "multiple_matching_tracks_frame_count": 0,
      "missing_geometric_match_source_frames": [
        3373
      ],
      "raw_target_coverage_before": 1935,
      "raw_target_coverage_after": 1935,
      "suppressed_boxes": 972,
      "cross_class_suppressed_boxes": 972,
      "neighbor_reference_observations": 11631,
      "neighbor_raw_covered_before": 11629,
      "neighbor_raw_covered_after": 11629,
      "neighbor_new_raw_coverage_losses": 0,
      "local_window": {
        "source_frame_interval": [
          2720,
          2841
        ],
        "reference_frames": 120,
        "matched_reference_frames": 120,
        "geometrically_matched_ids": {
          "354": 120
        },
        "multiple_matching_tracks_frames": []
      }
    },
    "vehicle_nms_080": {
      "reference_frames": 1935,
      "matched_reference_frames": 1934,
      "geometrically_matched_id_count": 2,
      "multiple_matching_tracks_frame_count": 19,
      "missing_geometric_match_source_frames": [
        3373
      ],
      "raw_target_coverage_before": 1935,
      "raw_target_coverage_after": 1935,
      "suppressed_boxes": 952,
      "cross_class_suppressed_boxes": 952,
      "neighbor_reference_observations": 11631,
      "neighbor_raw_covered_before": 11629,
      "neighbor_raw_covered_after": 11629,
      "neighbor_new_raw_coverage_losses": 0,
      "local_window": {
        "source_frame_interval": [
          2720,
          2841
        ],
        "reference_frames": 120,
        "matched_reference_frames": 120,
        "geometrically_matched_ids": {
          "354": 116,
          "777": 12
        },
        "multiple_matching_tracks_frames": [
          2720,
          2759,
          2760,
          2780,
          2783,
          2784,
          2789,
          2791
        ]
      }
    }
  },
  "interpretation": "In the locally verified transition, filtering duplicate car/bus/truck detections at IoU>=0.7 before otherwise unchanged ByteTrack removes multiple matching tracks while retaining all120 observed-reference-frame matches.",
  "limitations": [
    "Metrics are geometric matches (IoU>=0.5) against existing V11 target boxes473+1101, not independently annotated per-frame identity or detection ground truth.",
    "The local interval2720..2840 contains121 source frames but only120 frames with baseline reference boxes.",
    "Geometric ID count is not a count of true identity switches; nearby or duplicate boxes can also match.",
    "At source frame3373 (56.2167s), both NMS replays have no tracker box matching the reference atIoU>=0.5; raw target coverage remains. This is not established detector recall loss.",
    "Neighbor coverage excludes boxes overlapping target referenceIoU>=0.3 and uses existing tracked boxes. Zero newly lost coverage is not independent safety validation.",
    "Only one60-second source was replayed. The NMS threshold is a research candidate, not a promoted production default."
  ],
  "source_hash_unchanged": true,
  "website_baseline_changed": false,
  "model_default_changed": false
}