{
  "version": 2,
  "native_size": [
    4877,
    6060
  ],
  "source_sha256": "c77cb25377bb5ce5afa0968762b40b3d138bb3a73616a180684bd565e368e48a",
  "selected_pixels": 1796362,
  "coverage": 0.060781089386363285,
  "exclusion_pixels": 5123011,
  "exclusion_coverage": 0.1733404455885408,
  "baseline_pixels": 597849,
  "added_pixels": 1206905,
  "removed_baseline_in_protected_photographic_regions": 8392,
  "dark_stroke_pixels": 450104,
  "noise_normalized": 0.002350762997082606,
  "strong_threshold_normalized": 0.012,
  "weak_threshold_normalized": 0.004701525994165212,
  "regions_fractional_xyxy": [
    [
      0.018,
      0.02,
      0.32,
      0.965
    ],
    [
      0.31,
      0.39,
      0.76,
      0.75
    ],
    [
      0.33,
      0.84,
      0.63,
      0.985
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.36,
      0.875,
      0.63,
      0.985
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.466,
      0.462,
      0.501,
      0.672
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 16291,
    "dark": 231
  },
  "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."
}