{
  "version": 2,
  "native_size": [
    4955,
    6153
  ],
  "source_sha256": "ea8d1d342df6f04d0fd9562748dbf1e61f02b9452c758524d4d83442d7e77b17",
  "selected_pixels": 775711,
  "coverage": 0.025443061993173404,
  "exclusion_pixels": 1944999,
  "exclusion_coverage": 0.06379531827402252,
  "baseline_pixels": 321571,
  "added_pixels": 454140,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 104786,
  "noise_normalized": 0.007689363529226529,
  "strong_threshold_normalized": 0.030757454116906117,
  "weak_threshold_normalized": 0.015378727058453058,
  "regions_fractional_xyxy": [
    [
      0.018,
      0.02,
      0.195,
      0.973
    ],
    [
      0.3,
      0.39,
      0.72,
      0.6
    ],
    [
      0.42,
      0.87,
      0.7,
      0.98
    ]
  ],
  "dark_regions_fractional_xyxy": [],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.454,
      0.445,
      0.501,
      0.48
    ],
    [
      0.455,
      0.502,
      0.503,
      0.536
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 4452,
    "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."
}