{
  "version": 2,
  "native_size": [
    5172,
    4053
  ],
  "source_sha256": "89f7de30436c0b2dda88d0771c810305268f69fa16c17cc834d069af5b5eb841",
  "selected_pixels": 735067,
  "coverage": 0.035066450352626614,
  "exclusion_pixels": 1577967,
  "exclusion_coverage": 0.07527708557666601,
  "baseline_pixels": 381277,
  "added_pixels": 380499,
  "removed_baseline_in_protected_photographic_regions": 26709,
  "dark_stroke_pixels": 123496,
  "noise_normalized": 0.005031737103536331,
  "strong_threshold_normalized": 0.020126948414145324,
  "weak_threshold_normalized": 0.010063474207072662,
  "regions_fractional_xyxy": [
    [
      0.019,
      0.025,
      0.179,
      0.96
    ],
    [
      0.36,
      0.072,
      0.393,
      0.665
    ],
    [
      0.43,
      0.065,
      0.452,
      0.58
    ],
    [
      0.474,
      0.14,
      0.502,
      0.823
    ],
    [
      0.87,
      0.17,
      0.981,
      0.45
    ]
  ],
  "dark_regions_fractional_xyxy": [
    [
      0.87,
      0.17,
      0.981,
      0.45
    ]
  ],
  "protected_photographic_boxes_fractional_xyxy": [
    [
      0.402,
      0.065,
      0.429,
      0.68
    ],
    [
      0.452,
      0.14,
      0.474,
      0.825
    ]
  ],
  "protected_pixels_excluded": 0,
  "polarity_components": {
    "bright": 3351,
    "dark": 249
  },
  "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."
}