{
  "version": 2,
  "native_size": [
    6078,
    4865
  ],
  "source_sha256": "069546740bdd54763f1a410615ff84a8d6f7c0fd604b27739ab10e0ee0c27525",
  "selected_pixels": 410525,
  "coverage": 0.01388340744693767,
  "exclusion_pixels": 670883,
  "exclusion_coverage": 0.022688367427620447,
  "baseline_pixels": 100554,
  "added_pixels": 309971,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 18193,
  "noise_normalized": 0.007623395486475583,
  "strong_threshold_normalized": 0.03049358194590233,
  "weak_threshold_normalized": 0.015246790972951165,
  "regions_fractional_xyxy": [
    [
      0.0,
      0.2,
      0.125,
      0.99
    ],
    [
      0.12,
      0.01,
      0.29,
      0.16
    ],
    [
      0.285,
      0.14,
      0.435,
      0.34
    ],
    [
      0.2,
      0.31,
      0.325,
      0.48
    ],
    [
      0.43,
      0.36,
      0.58,
      0.55
    ],
    [
      0.56,
      0.11,
      0.7,
      0.27
    ],
    [
      0.72,
      0.38,
      0.89,
      0.58
    ],
    [
      0.81,
      0.23,
      0.97,
      0.4
    ]
  ],
  "dark_regions_fractional_xyxy": [],
  "protected_photographic_boxes_fractional_xyxy": [],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 777,
    "dark": 0
  },
  "catalog_positions_near_exclusion": 0,
  "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."
}