{
  "title": "Vessel condition",
  "status": "Illustrative annotation draft",
  "authoring": "Agent-authored editorial example; not human-approved training labels, a validated track or backend output.",
  "source": {
    "reference": "jxkbykxne4oh1",
    "window_seconds": [
      6,
      10
    ],
    "timestamp_origin": "Elapsed time in the local source recording; absolute capture date and location unverified.",
    "poster_source_seconds": 6,
    "display_dimensions": [
      838,
      720
    ]
  },
  "presentation": {
    "type": "Continuous source excerpt with editorial boxes",
    "duration_seconds": 4.0,
    "frames_per_second": 12,
    "full_frame": true,
    "audio": false
  },
  "method": {
    "geometry": "Coarse rectangular regions authored by visual inspection of displayed source frames.",
    "keyframe_spacing_seconds": 0.5,
    "interpolation": "Linear interpolation of rectangle edges between listed keyframes; no automated tracking or segmentation.",
    "coordinates": "Normalized xyxy in full displayed frame after applying source rotation; origin top left.",
    "timing": "Keyframes target elapsed source times. Source decoding and conversion to 12 fps introduce frame-sampling tolerance; source frame indices are not claimed.",
    "review": "Agent visual review only; requires project-specific human review before dataset use."
  },
  "selected_coverage": "A coarse rectangle around the visible hull-condition region, including the covering and occluded portions; it is not a damage mask or severity assessment.",
  "physical_output": {
    "selected_annotations": [
      {
        "id": "visible-hull-region",
        "label": "Visible hull deformation",
        "role": "condition region",
        "keyframes": [
          {
            "clip_time_seconds": 0.0,
            "box_xyxy_normalized": [
              0.46,
              0.348837,
              0.656667,
              0.705426
            ]
          },
          {
            "clip_time_seconds": 0.5,
            "box_xyxy_normalized": [
              0.486667,
              0.348837,
              0.683333,
              0.736434
            ]
          },
          {
            "clip_time_seconds": 1.0,
            "box_xyxy_normalized": [
              0.476667,
              0.337209,
              0.68,
              0.728682
            ]
          },
          {
            "clip_time_seconds": 1.5,
            "box_xyxy_normalized": [
              0.473333,
              0.348837,
              0.7,
              0.736434
            ]
          },
          {
            "clip_time_seconds": 2.0,
            "box_xyxy_normalized": [
              0.456667,
              0.352713,
              0.683333,
              0.786822
            ]
          },
          {
            "clip_time_seconds": 2.5,
            "box_xyxy_normalized": [
              0.44,
              0.310078,
              0.683333,
              0.794574
            ]
          },
          {
            "clip_time_seconds": 3.0,
            "box_xyxy_normalized": [
              0.42,
              0.337209,
              0.663333,
              0.790698
            ]
          },
          {
            "clip_time_seconds": 3.5,
            "box_xyxy_normalized": [
              0.423333,
              0.329457,
              0.66,
              0.817829
            ]
          },
          {
            "clip_time_seconds": 4.0,
            "box_xyxy_normalized": [
              0.426667,
              0.333333,
              0.686667,
              0.829457
            ]
          }
        ]
      }
    ]
  },
  "situational_output": {
    "observed": [
      "An irregular opening and deformed edges are visible on the vessel hull.",
      "A covering and an adjacent vessel partly obscure the region."
    ],
    "unknown": [
      "Cause, date, damage severity and repair status.",
      "Independently verified vessel identity or seaworthiness."
    ]
  },
  "limitations": [
    "Editorial example of proposed project outputs; does not establish production schema support.",
    "Sparse sampled rectangles may be coarse between keyframes and do not measure precision, clearance, severity or identity.",
    "No segmentation masks, exhaustive labels or confirmed object identities."
  ]
}