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The fine stage searched a 5x5 neighbourhood per pyramid level and seed. When the best coarse match is reliable (NCC score >= 0.8) and lies within one top-level pixel of the motion prediction, a 3x3 neighbourhood is enough; otherwise the 5x5 search stays. Fixes #2349 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>