{
  "version": 2,
  "native_size": [
    4955,
    6153
  ],
  "source_sha256": "21c318a8897cc405bad623742c1c3749d336ba4eb95cb444c62e25565498b445",
  "selected_pixels": 1348526,
  "coverage": 0.0442312028802043,
  "exclusion_pixels": 3449440,
  "exclusion_coverage": 0.1131404811350259,
  "baseline_pixels": 568828,
  "added_pixels": 779698,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 303780,
  "noise_normalized": 0.0047594540701102256,
  "strong_threshold_normalized": 0.019037816280440902,
  "weak_threshold_normalized": 0.009518908140220451,
  "regions_fractional_xyxy": [
    [
      0.022,
      0.018,
      0.175,
      0.975
    ],
    [
      0.13,
      0.22,
      0.77,
      0.91
    ],
    [
      0.44,
      0.92,
      0.57,
      0.985
    ]
  ],
  "dark_regions_fractional_xyxy": [],
  "protected_photographic_boxes_fractional_xyxy": [],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 9048,
    "dark": 0
  },
  "catalog_positions_near_exclusion": 772,
  "exclusion_padding_native_pixels": 3,
  "method": "Both-polarity local contrast; contextual short and round fragments; expanded inspected regions; explicit photographic exclusions; 3-pixel padding for separate exclusion mask",
  "annotation_png": "White contrast-rendered stencil of observed bright and dark marks. annotations-observed.png preserves stretched observed pixel appearance.",
  "limitations": "Higher-recall inspected candidate mask, not semantic ground truth. Compact astronomical images in writing neighborhoods, scratches and overlapping signal remain ambiguous. Exclusion padding is a safety margin, not recovered ink. No hidden sky is reconstructed."
}