{
  "version": 2,
  "native_size": [
    6162,
    4951
  ],
  "source_sha256": "d97c32759407c7993b409d34c785a6838f99e10521c6168bb9bc755784b7ebd8",
  "selected_pixels": 514341,
  "coverage": 0.016859182992351333,
  "exclusion_pixels": 1090544,
  "exclusion_coverage": 0.03574609229521036,
  "baseline_pixels": 146012,
  "added_pixels": 368329,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 152145,
  "noise_normalized": 0.003962357314827627,
  "strong_threshold_normalized": 0.01584942925931051,
  "weak_threshold_normalized": 0.007924714629655254,
  "regions_fractional_xyxy": [
    [
      0.885,
      0.04,
      0.99,
      0.56
    ],
    [
      0.84,
      0.82,
      0.99,
      0.982
    ]
  ],
  "dark_regions_fractional_xyxy": [],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.34,
      0.365,
      0.66,
      0.54
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 3192,
    "dark": 0
  },
  "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."
}