Inside the booth
Spot rolling-shutter distortion in a moving booth portrait
A sensor that reads rows in sequence can bend fast movement.
A quick head turn or hand wave may look slanted even when the phone is steady. A rolling shutter records different sensor rows at slightly different times, so the frame is not always one instant.
Look for geometric clues
Vertical door frames, fingers and fast gestures can lean or stretch when the subject moves during sequential row readout. The amount depends on the sensor’s readout behaviour and motion. A short exposure freezes blur but does not necessarily remove rolling-shutter geometry.
Evidence: Camera manufacturer technical guide
Repeat with a still pose
Capture one frame with the subject still and one with a gentle gesture under the same light. If the distortion changes with motion, it is likely a timing effect rather than a permanently tilted camera. A tripod cannot stop a moving hand from changing position during readout.
Choose a correction that fits
For a new strip, keep gestures slower or use a camera mode with faster readout if available. A global-shutter camera can avoid this particular row-skew mechanism, but most phones use other sensor designs. Do not promise a setting will fix every rolling-shutter artifact.
Evidence: Camera manufacturer technical guide
Sources & further reading
Sources for the specific facts and product descriptions above. Our worked examples, interpretations and practical suggestions are original editorial guidance.
- Basler, CMOS Rolling Shutter CamerasCamera manufacturer technical guide
- Basler, CMOS Global Shutter CamerasCamera manufacturer technical guide