{
  "classes": {
    "0": "background",
    "1": "placental_vessel",
    "2": "ablation_tool",
    "3": "fetus"
  },
  "encoding": "Single-channel PNG, PIL mode 'L', raw integer labels. Mutually exclusive. Verified exhaustively: all 2718 masks contain only values {0,1,2,3} -- no palette, no anti-aliasing strays.",
  "colormap_rgb": {
    "0": [
      0,
      0,
      0
    ],
    "1": [
      255,
      0,
      0
    ],
    "2": [
      0,
      0,
      255
    ],
    "3": [
      0,
      255,
      0
    ]
  },
  "colormap_source": "FetReg2021_segmentation_visualisation.py, shipped by the authors in the archive",
  "centers": {
    "I": "Fetal Medicine Unit, University College London Hospital, London, UK",
    "II": "Department of Fetal and Perinatal Medicine, Istituto \"Giannina Gaslini\", Genoa, Italy",
    "assignment": {
      "Video001": "I",
      "Video002": "I",
      "Video003": "I",
      "Video004": "II",
      "Video005": "II",
      "Video006": "II",
      "Video007": "I",
      "Video008": "I",
      "Video009": "I",
      "Video010": "II",
      "Video011": "II",
      "Video012": "II",
      "Video013": "I",
      "Video014": "I",
      "Video015": "I",
      "Video016": "II",
      "Video017": "II",
      "Video018": "II",
      "Video019": "I",
      "Video020": "I",
      "Video022": "II",
      "Video023": "II",
      "Video024": "II",
      "Video025": "I"
    },
    "note": "From Figures 4 and 5 of the MedIA 2024 findings paper. Paper Table 2's Center column swaps Video018 (really II) and Video019 (really I); the FetoPlac overlap proves Video019 is UCLH independently."
  },
  "occurrence_frame_measured": {
    "Video001": {
      "split": "train",
      "labelled_frames": 152,
      "vessel": 152,
      "tool": 21,
      "fetus": 11
    },
    "Video002": {
      "split": "train",
      "labelled_frames": 153,
      "vessel": 153,
      "tool": 35,
      "fetus": 1
    },
    "Video003": {
      "split": "train",
      "labelled_frames": 117,
      "vessel": 117,
      "tool": 52,
      "fetus": 32
    },
    "Video004": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 21,
      "fetus": 18
    },
    "Video005": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 35,
      "fetus": 30
    },
    "Video006": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 49,
      "fetus": 4
    },
    "Video007": {
      "split": "train",
      "labelled_frames": 140,
      "vessel": 140,
      "tool": 30,
      "fetus": 3
    },
    "Video008": {
      "split": "train",
      "labelled_frames": 110,
      "vessel": 105,
      "tool": 80,
      "fetus": 34
    },
    "Video009": {
      "split": "train",
      "labelled_frames": 105,
      "vessel": 104,
      "tool": 40,
      "fetus": 14
    },
    "Video011": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 7,
      "fetus": 37
    },
    "Video013": {
      "split": "train",
      "labelled_frames": 124,
      "vessel": 124,
      "tool": 54,
      "fetus": 21
    },
    "Video014": {
      "split": "train",
      "labelled_frames": 110,
      "vessel": 110,
      "tool": 54,
      "fetus": 14
    },
    "Video016": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 16,
      "fetus": 20
    },
    "Video017": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 97,
      "tool": 20,
      "fetus": 3
    },
    "Video018": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 26,
      "fetus": 11
    },
    "Video019": {
      "split": "train",
      "labelled_frames": 149,
      "vessel": 149,
      "tool": 15,
      "fetus": 31
    },
    "Video022": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 12,
      "fetus": 1
    },
    "Video023": {
      "split": "train",
      "labelled_frames": 100,
      "vessel": 92,
      "tool": 14,
      "fetus": 8
    },
    "Video010": {
      "split": "test",
      "labelled_frames": 100,
      "vessel": 92,
      "tool": 7,
      "fetus": 28
    },
    "Video012": {
      "split": "test",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 54,
      "fetus": 0
    },
    "Video015": {
      "split": "test",
      "labelled_frames": 125,
      "vessel": 124,
      "tool": 83,
      "fetus": 28
    },
    "Video020": {
      "split": "test",
      "labelled_frames": 123,
      "vessel": 122,
      "tool": 89,
      "fetus": 13
    },
    "Video024": {
      "split": "test",
      "labelled_frames": 100,
      "vessel": 100,
      "tool": 15,
      "fetus": 1
    },
    "Video025": {
      "split": "test",
      "labelled_frames": 110,
      "vessel": 110,
      "tool": 72,
      "fetus": 13
    }
  },
  "occurrence_note": "Number of labelled frames per video in which each class appears, measured from the actual masks. Paper Table 2's Occurrence(frame) column is row-shifted from Video020 downward -- its Video025 entry (648/320/83) is in fact the test-set column totals.",
  "fetoplac_overlap": {
    "description": "MedOtter/FetoPlac (Bano et al. MICCAI 2020) is a UCLH-only subset of these same TTTS procedures. Join key is the original video frame number embedded in both naming schemes.",
    "video_to_fetoplac_subject": {
      "Video001": "anon001",
      "Video002": "anon002",
      "Video003": "anon003",
      "Video007": "anon005",
      "Video019": "anon012"
    },
    "containment": {
      "Video001": "120/120",
      "Video002": "101/101",
      "Video003": "39/39",
      "Video007": "88/88",
      "Video019": "97/97"
    },
    "not_in_fetreg": [
      "anon010"
    ],
    "warning": "All overlap is inside FetReg's TRAIN split. Do not benchmark FetoPlac against a model trained on FetReg train, and never split these procedures across train/test."
  },
  "upstream_errata": {
    "Video016_train_clip": {
      "readme": 493,
      "actual": 593
    },
    "Video025_test_labelled": {
      "readme": 100,
      "actual": 110
    },
    "Video025_test_clip": {
      "readme_and_table2": 272,
      "actual": 292
    },
    "test_clip_total": {
      "paper": 2205,
      "actual": 2225
    },
    "grand_total_frames": {
      "paper": 9616,
      "actual": 9636
    }
  }
}