[Elphel-support] 10393 Imagers Synchronization

[Elphel Support]

Mohamed,



If you want to stitch images, you definitely want them synchronized (as we do with panoramic cameras). Without the synchronization you may consider them to have random times.



And in any case Exif file header contains the precise timestamps, so you may compare/use them.



Andrey



---- On Wed, 08 May 2019 14:14:20 -0700 Mohamed Morsy <mmorsy at redzone.com> wrote ----


If the camera is in motion and we wanted to stitch together the frames from all 4 imagers, would it be better to have them synchronized? If they weren't synchronized would the frames still match perfectly or would the offsets be noticeable?
 

Mohamed


From: Elphel Support <mailto:support-list at support.elphel.com>
 Sent: Wednesday, May 8, 2019 3:48:29 PM
 To: Mohamed Morsy; Elphel List
 Subject: Re: [Elphel-support] 10393 Imagers Synchronization  


Hello Mohammed,
 
 You can save camera settings so they will be precisely synchronized. In "free running" mode each sensor can have different WOI and so different FPS. You may find info on synchronization here: https://wiki.elphel.com/wiki/Trigger_393
 
 The disadvantage of synchronized mode is in low-light conditions, because when operated in free running mode rolling-shutter sensors can have exposure up to frame readout period (14.5 fps full resolution), exposure and readout overlap.
 
 In triggered mode exposure and readout are not overlapped, so frame period can not be below exposure time plus readout time. Other than that in triggered mode all sensors have beginning of exposure at exactly the same moment (to microsecond precision), same
 applies to multiple 393 camera if they are connected with sync cables
 
 Andrey
 
 



---- On Wed, 08 May 2019 12:32:00 -0700 Mohamed Morsy <mailto:mmorsy at redzone.com> wrote ----


Hello Oleg, 

I understand that when 4 imagers are connected to the 10393, they are not in sync by default. Do you know how out of sync they are? Also, is the lack of synchronization noticeable? If the cameras are in motion, will there be significant gaps between the
 different imagers' frames? If this is something you've tested please  let me know.



Thank you,



Mohamed Morsy

RedZone Robotics


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