{
  "version": 2,
  "native_size": [
    5192,
    4049
  ],
  "source_sha256": "520c5915db3f36df1f950341c02afed88ba0ed525e6f8b21d92d5a14fe5f4ae8",
  "selected_pixels": 904373,
  "coverage": 0.04301947712174552,
  "exclusion_pixels": 1677422,
  "exclusion_coverage": 0.07979209612904478,
  "baseline_pixels": 648512,
  "added_pixels": 256689,
  "removed_baseline_in_protected_photographic_regions": 828,
  "dark_stroke_pixels": 105868,
  "noise_normalized": 0.004657128621887623,
  "strong_threshold_normalized": 0.018628514487550492,
  "weak_threshold_normalized": 0.009314257243775246,
  "regions_fractional_xyxy": [
    [
      0.025,
      0.028,
      0.182,
      0.965
    ],
    [
      0.382,
      0.075,
      0.424,
      0.661
    ],
    [
      0.508,
      0.158,
      0.558,
      0.813
    ],
    [
      0.875,
      0.27,
      0.981,
      0.5
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.875,
      0.27,
      0.981,
      0.51
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.427,
      0.075,
      0.448,
      0.66
    ],
    [
      0.48,
      0.16,
      0.508,
      0.81
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 3186,
    "dark": 199
  },
  "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."
}