{
  "schema_version": "1.0.0",
  "asset_id": "fa7c7f295d02aab5",
  "dataset_type": "human_egocentric_observation",
  "channels": {
    "quality": {
      "rows": 34,
      "source": "measured",
      "estimator": null,
      "columns": {
        "t_s": "Float64",
        "sharpness": "Float64",
        "exposure": "Float64"
      },
      "null_counts": {
        "t_s": 0,
        "sharpness": 0,
        "exposure": 0
      },
      "unique_timestamps": 34
    },
    "tracks_raw": {
      "rows": 610,
      "source": "estimated",
      "estimator": "owlv2:base-patch16-ensemble+openvocab+bytetrack",
      "columns": {
        "t_s": "Float64",
        "track_id": "Int64",
        "label": "String",
        "confidence": "Float64",
        "x1": "Float64",
        "y1": "Float64",
        "x2": "Float64",
        "y2": "Float64"
      },
      "null_counts": {
        "t_s": 0,
        "track_id": 0,
        "label": 0,
        "confidence": 0,
        "x1": 0,
        "y1": 0,
        "x2": 0,
        "y2": 0
      },
      "unique_timestamps": 172
    },
    "tracks": {
      "rows": 624,
      "source": "estimated",
      "estimator": "owlv2:base-patch16-ensemble+openvocab+bytetrack+track_temporal:bridge+oneeuro:v1",
      "columns": {
        "t_s": "Float64",
        "track_id": "Int64",
        "label": "String",
        "confidence": "Float64",
        "x1": "Float64",
        "y1": "Float64",
        "x2": "Float64",
        "y2": "Float64",
        "provenance": "String"
      },
      "null_counts": {
        "t_s": 0,
        "track_id": 0,
        "label": 0,
        "confidence": 14,
        "x1": 0,
        "y1": 0,
        "x2": 0,
        "y2": 0,
        "provenance": 0
      },
      "unique_timestamps": 172,
      "provenance_rows": [
        {
          "provenance": "detected",
          "len": 25
        },
        {
          "provenance": "smoothed",
          "len": 585
        },
        {
          "provenance": "interpolated",
          "len": 14
        }
      ]
    },
    "hand_pose_raw": {
      "rows": 19761,
      "source": "estimated",
      "estimator": "rtmpose:rtmw-x+hand5-cascade+ego_duplicate_suppression:v1",
      "columns": {
        "t_s": "Float64",
        "hand": "Int64",
        "handedness": "String",
        "hand_score": "Float64",
        "kp_index": "Int64",
        "kp_name": "String",
        "x": "Float64",
        "y": "Float64",
        "z": "Float64",
        "wx": "Float64",
        "wy": "Float64",
        "wz": "Float64",
        "kp_score": "Float64"
      },
      "null_counts": {
        "t_s": 0,
        "hand": 0,
        "handedness": 0,
        "hand_score": 0,
        "kp_index": 0,
        "kp_name": 0,
        "x": 0,
        "y": 0,
        "z": 19761,
        "wx": 19761,
        "wy": 19761,
        "wz": 19761,
        "kp_score": 0
      },
      "unique_timestamps": 516,
      "handedness_rows": [
        {
          "handedness": "left",
          "len": 4305
        },
        {
          "handedness": "right",
          "len": 4158
        },
        {
          "handedness": "unknown",
          "len": 11298
        }
      ]
    },
    "hand_pose": {
      "rows": 20013,
      "source": "estimated",
      "estimator": "rtmpose:rtmw-x+hand5-cascade+ego_duplicate_suppression:v1+hands_temporal:greedy+oneeuro:v1",
      "columns": {
        "t_s": "Float64",
        "hand": "Int64",
        "handedness": "String",
        "hand_score": "Float64",
        "kp_index": "Int64",
        "kp_name": "String",
        "x": "Float64",
        "y": "Float64",
        "z": "Float64",
        "wx": "Float64",
        "wy": "Float64",
        "wz": "Float64",
        "kp_score": "Float64",
        "provenance": "String",
        "det_index": "Int64"
      },
      "null_counts": {
        "t_s": 0,
        "hand": 0,
        "handedness": 0,
        "hand_score": 0,
        "kp_index": 0,
        "kp_name": 0,
        "x": 0,
        "y": 0,
        "z": 20013,
        "wx": 20013,
        "wy": 20013,
        "wz": 20013,
        "kp_score": 0,
        "provenance": 0,
        "det_index": 294
      },
      "unique_timestamps": 515,
      "provenance_rows": [
        {
          "provenance": "smoothed",
          "len": 19572
        },
        {
          "provenance": "detected",
          "len": 147
        },
        {
          "provenance": "interpolated",
          "len": 294
        }
      ],
      "handedness_rows": [
        {
          "handedness": "unknown",
          "len": 19047
        },
        {
          "handedness": "left",
          "len": 483
        },
        {
          "handedness": "right",
          "len": 483
        }
      ]
    },
    "hand_world_trajectory": {
      "rows": 886,
      "source": "estimated",
      "estimator": "arkit_world+rtmpose",
      "columns": {
        "t_s": "Float64",
        "hand": "Int64",
        "handedness": "String",
        "hand_score": "Float64",
        "px": "Float64",
        "py": "Float64",
        "pz": "Float64",
        "qx": "Float64",
        "qy": "Float64",
        "qz": "Float64",
        "qw": "Float64",
        "cam_px": "Float64",
        "cam_py": "Float64",
        "cam_pz": "Float64",
        "orient_valid": "Boolean",
        "provenance": "String"
      },
      "null_counts": {
        "t_s": 0,
        "hand": 0,
        "handedness": 0,
        "hand_score": 0,
        "px": 0,
        "py": 0,
        "pz": 0,
        "qx": 842,
        "qy": 842,
        "qz": 842,
        "qw": 842,
        "cam_px": 0,
        "cam_py": 0,
        "cam_pz": 0,
        "orient_valid": 0,
        "provenance": 0
      },
      "unique_timestamps": 506,
      "provenance_rows": [
        {
          "provenance": "smoothed",
          "len": 871
        },
        {
          "provenance": "interpolated",
          "len": 11
        },
        {
          "provenance": "detected",
          "len": 4
        }
      ],
      "handedness_rows": [
        {
          "handedness": "left",
          "len": 23
        },
        {
          "handedness": "right",
          "len": 21
        },
        {
          "handedness": "unknown",
          "len": 842
        }
      ]
    },
    "contact": {
      "rows": 2419,
      "source": "estimated",
      "estimator": "geometric:handpose-x-tracks+depthgate+debounce",
      "columns": {
        "t_s": "Float64",
        "hand": "Int64",
        "handedness": "String",
        "track_id": "Int64",
        "label": "String",
        "target_kind": "String",
        "iou": "Float64",
        "fingertips_inside": "Int64",
        "tip_depth_m": "Float64",
        "obj_depth_m": "Float64",
        "depth_gap_m": "Float64",
        "depth_tier": "String",
        "method": "String",
        "provenance": "String",
        "contact": "Boolean",
        "contact_state": "Boolean"
      },
      "null_counts": {
        "t_s": 0,
        "hand": 0,
        "handedness": 0,
        "track_id": 0,
        "label": 0,
        "target_kind": 0,
        "iou": 0,
        "fingertips_inside": 0,
        "tip_depth_m": 22,
        "obj_depth_m": 3,
        "depth_gap_m": 25,
        "depth_tier": 25,
        "method": 0,
        "provenance": 0,
        "contact": 0,
        "contact_state": 0
      },
      "unique_timestamps": 512,
      "provenance_rows": [
        {
          "provenance": "smoothed",
          "len": 2330
        },
        {
          "provenance": "interpolated",
          "len": 85
        },
        {
          "provenance": "detected",
          "len": 4
        }
      ],
      "handedness_rows": [
        {
          "handedness": "unknown",
          "len": 2328
        },
        {
          "handedness": "left",
          "len": 50
        },
        {
          "handedness": "right",
          "len": 41
        }
      ]
    },
    "contact_events": {
      "rows": 41,
      "source": "estimated",
      "estimator": "geometric:handpose-x-tracks+depthgate+debounce",
      "columns": {
        "hand": "Int64",
        "handedness": "String",
        "track_id": "Int64",
        "label": "String",
        "target_kind": "String",
        "t_on_s": "Float64",
        "t_off_s": "Float64",
        "duration_s": "Float64",
        "n_contact_samples": "Int64",
        "method": "String",
        "depth_tier": "String",
        "provenance": "String"
      },
      "null_counts": {
        "hand": 0,
        "handedness": 0,
        "track_id": 0,
        "label": 0,
        "target_kind": 0,
        "t_on_s": 0,
        "t_off_s": 4,
        "duration_s": 4,
        "n_contact_samples": 0,
        "method": 0,
        "depth_tier": 0,
        "provenance": 0
      },
      "provenance_rows": [
        {
          "provenance": "smoothed",
          "len": 23
        },
        {
          "provenance": "interpolated",
          "len": 18
        }
      ],
      "handedness_rows": [
        {
          "handedness": "left",
          "len": 5
        },
        {
          "handedness": "unknown",
          "len": 33
        },
        {
          "handedness": "right",
          "len": 3
        }
      ]
    },
    "arkit_poses": {
      "rows": 2063,
      "source": "estimated",
      "estimator": "arkit:stray_scanner",
      "columns": {
        "t_s": "Float64",
        "tx": "Float64",
        "ty": "Float64",
        "tz": "Float64",
        "qx": "Float64",
        "qy": "Float64",
        "qz": "Float64",
        "qw": "Float64"
      },
      "null_counts": {
        "t_s": 0,
        "tx": 0,
        "ty": 0,
        "tz": 0,
        "qx": 0,
        "qy": 0,
        "qz": 0,
        "qw": 0
      },
      "unique_timestamps": 2063
    },
    "frame_mapping": {
      "rows": 2063,
      "source": "measured",
      "estimator": "stray:explicit_frame_id",
      "columns": {
        "t_s": "Float64",
        "source_frame_index": "Int64",
        "video_pts_s": "Float64",
        "sensor_timestamp_s": "Float64",
        "sensor_t_s": "Float64",
        "rgb_decodable": "Boolean",
        "rgb_frame_index": "Int64"
      },
      "null_counts": {
        "t_s": 0,
        "source_frame_index": 0,
        "video_pts_s": 0,
        "sensor_timestamp_s": 0,
        "sensor_t_s": 0,
        "rgb_decodable": 0,
        "rgb_frame_index": 1
      },
      "unique_timestamps": 2063
    },
    "camera_intrinsics": {
      "rows": 2063,
      "source": "measured",
      "estimator": "stray:device_calibration",
      "columns": {
        "t_s": "Float64",
        "source_frame_index": "Int64",
        "fx": "Float64",
        "fy": "Float64",
        "cx": "Float64",
        "cy": "Float64",
        "width": "Int64",
        "height": "Int64",
        "calibration_source": "String"
      },
      "null_counts": {
        "t_s": 0,
        "source_frame_index": 0,
        "fx": 0,
        "fy": 0,
        "cx": 0,
        "cy": 0,
        "width": 0,
        "height": 0,
        "calibration_source": 0
      },
      "unique_timestamps": 2063
    },
    "device_imu": {
      "rows": 3459,
      "source": "measured",
      "estimator": "stray:raw_device_imu",
      "columns": {
        "sensor_timestamp_s": "Float64",
        "sensor_t_s": "Float64",
        "t_s": "Float64",
        "clock_mapping_valid": "Boolean",
        "a_x": "Float64",
        "a_y": "Float64",
        "a_z": "Float64",
        "alpha_x": "Float64",
        "alpha_y": "Float64",
        "alpha_z": "Float64"
      },
      "null_counts": {
        "sensor_timestamp_s": 0,
        "sensor_t_s": 0,
        "t_s": 14,
        "clock_mapping_valid": 0,
        "a_x": 0,
        "a_y": 0,
        "a_z": 0,
        "alpha_x": 0,
        "alpha_y": 0,
        "alpha_z": 0
      },
      "unique_timestamps": 3445
    }
  },
  "annotation_accuracy": "not_independently_evaluated",
  "public_release_ready": true,
  "release_checks": {
    "license": "cc-by-4.0",
    "ownership": "owner_attested",
    "privacy_review": "automated_full_video_face_scan; sampled_visual_inspection; no_human_attestation",
    "annotation_review": "assistant_sampled_visual_review; independent_accuracy_not_measured",
    "technical_validation": "passed; see validation.json"
  },
  "sensor_completeness": {
    "frame_mapping": 2063,
    "arkit_poses": 2063,
    "camera_intrinsics": 2063,
    "measured_depth_index": 2063,
    "device_imu": 3459,
    "rgb_frames": 2062,
    "displayed_rgb_frames": 2062,
    "frame_tables_match_rgb": true
  },
  "warnings": [
    "Annotation coverage is not an accuracy measurement.",
    "Device ARKit pose is a VIO estimate, not independent motion-capture ground truth.",
    "Raw device acceleration units require capture-version verification; no conversion applied.",
    "No robot commands, force, tactile measurements or execution success are provided."
  ],
  "hand_candidate_selection": {
    "candidates": 1828,
    "kept": 941,
    "duplicate_groups": 697,
    "label_conflicts": 570,
    "max_hands": 2
  },
  "clock_mapping": {
    "method": "explicit_source_frame_id_with_discard_flags",
    "mapping_version": 2,
    "displayed_frame_count": 2062,
    "discarded_packet_count": 1,
    "time_domain": "rgb_pts_relative_to_first_frame",
    "frame_count": 2063,
    "max_original_clock_difference_ms": 101.40445799915909,
    "physical_sync_accuracy": "not_independently_measured"
  },
  "internal_only_channels": [
    "body_pose",
    "privacy",
    "measured_depth_index",
    "hand_pose_candidates"
  ],
  "release_scope": "public evaluation sample; estimated annotations experimental"
}