{
  "version": 2,
  "native_size": [
    6054,
    4865
  ],
  "source_sha256": "29f6a1d64cc205cbf379a1114a239f99b00e8dff2c2478e93a90e2fac6129537",
  "selected_pixels": 509930,
  "coverage": 0.01731351716022057,
  "exclusion_pixels": 915925,
  "exclusion_coverage": 0.031098157011697734,
  "baseline_pixels": 145562,
  "added_pixels": 364368,
  "removed_baseline_in_protected_photographic_regions": 0,
  "dark_stroke_pixels": 43624,
  "noise_normalized": 0.004976817550617161,
  "strong_threshold_normalized": 0.019907270202468644,
  "weak_threshold_normalized": 0.009953635101234322,
  "regions_fractional_xyxy": [
    [
      0.0,
      0.16,
      0.122,
      0.985
    ],
    [
      0.12,
      0.01,
      0.31,
      0.16
    ],
    [
      0.27,
      0.12,
      0.45,
      0.33
    ],
    [
      0.19,
      0.28,
      0.36,
      0.48
    ],
    [
      0.43,
      0.37,
      0.59,
      0.56
    ],
    [
      0.55,
      0.09,
      0.72,
      0.28
    ],
    [
      0.71,
      0.37,
      0.9,
      0.59
    ],
    [
      0.81,
      0.2,
      0.975,
      0.41
    ]
  ],
  "dark_regions_fractional_xyxy": [],
  "protected_photographic_boxes_fractional_xyxy": [],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 1287,
    "dark": 0
  },
  "catalog_positions_near_exclusion": 2,
  "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."
}