{
  "version": 2,
  "native_size": [
    4177,
    9712
  ],
  "source_sha256": "e227680ee38936714dfd56e27beeeef4f2c2ae5eaad2843d557fcb84af5f891e",
  "selected_pixels": 1737597,
  "coverage": 0.04283274513802146,
  "exclusion_pixels": 3319692,
  "exclusion_coverage": 0.08183227835495155,
  "baseline_pixels": 1319233,
  "added_pixels": 440933,
  "removed_baseline_in_protected_photographic_regions": 22569,
  "dark_stroke_pixels": 119107,
  "noise_normalized": 0.005983204690308186,
  "strong_threshold_normalized": 0.023932818761232745,
  "weak_threshold_normalized": 0.011966409380616373,
  "regions_fractional_xyxy": [
    [
      0.075,
      0.04,
      0.3,
      0.23
    ],
    [
      0.68,
      0.04,
      0.96,
      0.23
    ],
    [
      0.075,
      0.69,
      0.35,
      0.96
    ],
    [
      0.3,
      0.77,
      0.91,
      0.955
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.68,
      0.04,
      0.96,
      0.23
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.45,
      0.125,
      0.61,
      0.807
    ],
    [
      0.4719804651844354,
      0.1429159802306425,
      0.5330517398767622,
      0.7370263591433278
    ],
    [
      0.4854030103511819,
      0.1429159802306425,
      0.5418098796781465,
      0.7370263591433278
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 5238,
    "dark": 685
  },
  "catalog_positions_near_exclusion": null,
  "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."
}