Images displayed together do not by themselves establish simultaneous camera exposure. A display may show images captured, transferred or decoded at different times, or retain a previous frame. Exposure synchronization needs measurements for specified events and allowed time differences. Display appearance does not replace that check.
Identify the event that needs synchronization
Determine whether the task requires closely aligned exposure starts, overlapping exposure intervals or corresponding views of the same workpiece at different positions. These are different requirements. For moving targets, define acceptable conditions using shutter mode, exposure duration and motion; do not apply a universal time limit.
What evidence is needed beyond an existing preview?
Provide camera models, firmware, exposure and trigger settings, timestamp-field definitions, original frames and corresponding logs. Identify time-recording points in the camera, driver, application and display. For external measurements, retain the measured event, wiring, instruments, records and error sources. Without exposure-event evidence, state that exposure timing remains unverified.
Are PTP or a shared trigger source sufficient?
PTP and a shared trigger source provide conditions for clock synchronization and event control respectively. Device configuration and measurements still need checking. The manufacturer trigger documentation and PTP documentation explain mechanisms. They establish neither synchronization of arbitrary camera combinations nor availability of every feature on a particular model.
How should a system without timing evidence be described?
Record that multi-camera previews are visible and exposure timing remains to be measured. Separately describe any verified frame-association, display or transfer scope. Do not treat shared screen refresh, matching frame numbers or one static image as passed exposure-synchronization acceptance. Later, verify timing and business results separately during normal acquisition, missing frames, reconnection and the target workload.
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