{
  "version": 2,
  "native_size": [
    5168,
    4089
  ],
  "source_sha256": "4d310725169622299ba56bc5a3ad6fdf166ace75119ab05a587b82858d4c494f",
  "selected_pixels": 1079163,
  "coverage": 0.05106783320348258,
  "exclusion_pixels": 2865808,
  "exclusion_coverage": 0.13561492095003813,
  "baseline_pixels": 376719,
  "added_pixels": 702444,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 211785,
  "noise_normalized": 0.0035949975997984205,
  "strong_threshold_normalized": 0.014379990399193682,
  "weak_threshold_normalized": 0.007189995199596841,
  "regions_fractional_xyxy": [
    [
      0.018,
      0.02,
      0.226,
      0.977
    ],
    [
      0.245,
      0.23,
      0.7,
      0.79
    ],
    [
      0.855,
      0.015,
      0.987,
      0.18
    ],
    [
      0.855,
      0.37,
      0.988,
      0.68
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.85,
      0.37,
      0.99,
      0.68
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 7835,
    "dark": 440
  },
  "catalog_positions_near_exclusion": 304,
  "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."
}