{
  "version": 2,
  "native_size": [
    6060,
    4877
  ],
  "source_sha256": "2ed6cdcea3d5551d3f423b95bfae0f6c66fb4f4ca296fb6a0bd6b47d783e85ee",
  "selected_pixels": 1836303,
  "coverage": 0.0621325193827564,
  "exclusion_pixels": 4672585,
  "exclusion_coverage": 0.15809998572135253,
  "baseline_pixels": 656207,
  "added_pixels": 1180096,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 415441,
  "noise_normalized": 0.004375037481161773,
  "strong_threshold_normalized": 0.01750014992464709,
  "weak_threshold_normalized": 0.008750074962323546,
  "regions_fractional_xyxy": [
    [
      0.009,
      0.006,
      0.975,
      0.13
    ],
    [
      0.025,
      0.25,
      0.984,
      0.65
    ],
    [
      0.02,
      0.27,
      0.115,
      0.962
    ],
    [
      0.31,
      0.65,
      0.57,
      0.81
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.022,
      0.32,
      0.115,
      0.962
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 12895,
    "dark": 440
  },
  "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."
}