Camera shake: directional ghosts, IBIS limits, and noise coupling
Shake blur often shows as a streak along one direction with mild double contours on static lampposts or window mullions—different from uniform defocus disks or subject-only motion trails. `camera-shake-reduce` is common for night streets, dim venues, telephoto handheld frames, or that one burst frame that landed on a micro-tremor peak. Pair it carefully with noise: aggressive shake reduction can turn pepper noise into directional streaks, so mild denoise first—or staged strength—often behaves better than one nuclear pass. Telephoto magnifies the same hand motion more than ultrawide, so watch verticals and horizons for waviness or over-straightening. After correction, read distant signage and clock ticks; if strokes look combed or duplicated, back off. For burst sequences, median or align-and-average stacks sometimes beat heroic single-frame AI; this page’s lane is the quick save before you post or email a client preview.
Shake reduction steps
- In `camera-shake-reduce`, estimate streak direction and length to separate shake from pure misfocus.
- Check buildings, rulers, and distant type for waxy flattening or leftover double edges.
- If noise streaks appear, lower strength or denoise lightly before a second pass.